diff --git a/slaves/linux-cross/Dockerfile b/slaves/linux-cross/Dockerfile
index eef12d9..eaf826a 100644
--- a/slaves/linux-cross/Dockerfile
+++ b/slaves/linux-cross/Dockerfile
@@ -51,10 +51,13 @@ RUN /bin/bash build_toolchain_root.sh && \
 COPY linux-cross/build_toolchain.sh \
     linux-cross/aarch64-linux-gnu.config \
     linux-cross/arm-linux-gnueabi.config \
+    linux-cross/arm-linux-musleabi.config \
     linux-cross/arm-linux-gnueabihf.config \
+    linux-cross/arm-linux-musleabihf.config \
     linux-cross/mips-linux-musl.config \
     linux-cross/mipsel-linux-musl.config \
     linux-cross/armv7-linux-gnueabihf.config \
+    linux-cross/armv7-linux-musleabihf.config \
     /build/
 USER rustbuild
 
@@ -98,6 +101,11 @@ RUN /bin/bash build_toolchain.sh mipsel-linux-musl
 # for armv7 instead of for armv6 should make rustc (slightly) faster.
 RUN /bin/bash build_toolchain.sh armv7-linux-gnueabihf
 
+# Build a bunch of toolchains for ARM musl targets
+RUN /bin/bash build_toolchain.sh arm-linux-musleabi
+RUN /bin/bash build_toolchain.sh arm-linux-musleabihf
+RUN /bin/bash build_toolchain.sh armv7-linux-musleabihf
+
 USER root
 
 # Rename all the compilers we just built into /usr/bin and also without
@@ -124,12 +132,27 @@ RUN bash /tmp/build_dragonfly_toolchain.sh
 COPY linux-cross/build_netbsd_toolchain.sh /tmp/
 RUN bash /tmp/build_netbsd_toolchain.sh
 
+# Also build libunwind.a for the ARM musl targets
+COPY linux-cross/build-libunwind.sh \
+    /build/
+RUN /bin/bash build-libunwind.sh arm-unknown-linux-musleabi
+RUN /bin/bash build-libunwind.sh arm-unknown-linux-musleabihf
+RUN /bin/bash build-libunwind.sh armv7-unknown-linux-musleabihf
 
 # Instruct rustbuild to use the armv7-linux-gnueabihf toolchain instead of the
 # default arm-linux-gnueabihf one
 ENV AR_armv7_unknown_linux_gnueabihf=armv7-linux-gnueabihf-ar \
     CC_armv7_unknown_linux_gnueabihf=armv7-linux-gnueabihf-gcc \
     CXX_armv7_unknown_linux_gnueabihf=armv7-linux-gnueabihf-g++ \
+    AR_arm_unknown_linux_musleabi=arm-linux-musleabi-ar \
+    CC_arm_unknown_linux_musleabi=arm-linux-musleabi-gcc \
+    CXX_arm_unknown_linux_musleabi=arm-linux-musleabi-g++ \
+    AR_arm_unknown_linux_musleabihf=arm-linux-musleabihf-ar \
+    CC_arm_unknown_linux_musleabihf=arm-linux-musleabihf-gcc \
+    CXX_arm_unknown_linux_musleabihf=arm-linux-musleabihf-g++ \
+    AR_armv7_unknown_linux_musleabihf=armv7-linux-musleabihf-ar \
+    CC_armv7_unknown_linux_musleabihf=armv7-linux-musleabihf-gcc \
+    CXX_armv7_unknown_linux_musleabihf=armv7-linux-musleabihf-g++ \
     AR_x86_64_unknown_freebsd=x86_64-unknown-freebsd10-ar \
     CC_x86_64_unknown_freebsd=x86_64-unknown-freebsd10-gcc \
     CXX_x86_64_unknown_freebsd=x86_64-unknown-freebsd10-g++ \
diff --git a/slaves/linux-cross/README.md b/slaves/linux-cross/README.md
index bc98f36..3723036 100644
--- a/slaves/linux-cross/README.md
+++ b/slaves/linux-cross/README.md
@@ -89,6 +89,20 @@ For targets: `arm-unknown-linux-gnueabi`
 - C compiler > gcc version = 4.9.3
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
+## `arm-linux-musleabi.config`
+
+For targets: `arm-unknown-linux-musleabi`
+
+- Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
+- Target options > Target Architecture = arm
+- Target options > Architecture level = armv6 -- (+)
+- Target options > Floating point = software (no FPU) -- (\*)
+- Operating System > Target OS = linux
+- Operating System > Linux kernel version = 3.2.72 -- Precise kernel
+- C-library > C library = musl
+- C compiler > gcc version = 5.2.0
+- C compiler > C++ = ENABLE -- to cross compile LLVM
+
 ## `arm-linux-gnueabihf.config`
 
 For targets: `arm-unknown-linux-gnueabihf`
@@ -105,6 +119,22 @@ For targets: `arm-unknown-linux-gnueabihf`
 - C compiler > gcc version = 4.9.3
 - C compiler > C++ = ENABLE -- to cross compile LLVM
 
+## `arm-linux-musleabihf.config`
+
+For targets: `arm-unknown-linux-musleabihf`
+
+- Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
+- Target options > Target Architecture = arm
+- Target options > Architecture level = armv6 -- (+)
+- Target options > Use specific FPU = vfp -- (+)
+- Target options > Floating point = hardware (FPU) -- (\*)
+- Target options > Default instruction set mode = arm -- (+)
+- Operating System > Target OS = linux
+- Operating System > Linux kernel version = 3.2.72 -- Precise kernel
+- C-library > C library = musl
+- C compiler > gcc version = 5.2.0
+- C compiler > C++ = ENABLE -- to cross compile LLVM
+
 ## `armv7-linux-gnueabihf.config`
 
 For targets: `armv7-unknown-linux-gnueabihf`
@@ -128,6 +158,23 @@ For targets: `armv7-unknown-linux-gnueabihf`
     libraries like jemalloc. See the mk/cfg/arm(v7)-uknown-linux-gnueabi{,hf}.mk
     file in Rust's source code.
 
+## `armv7-linux-musleabihf.config`
+
+For targets: `armv7-unknown-linux-musleabihf`
+
+- Path and misc options > Prefix directory = /x-tools/${CT\_TARGET}
+- Target options > Target Architecture = arm
+- Target options > Suffix to the arch-part = v7
+- Target options > Architecture level = armv7-a -- (+)
+- Target options > Use specific FPU = vfpv3-d16 -- (\*)
+- Target options > Floating point = hardware (FPU) -- (\*)
+- Target options > Default instruction set mode = thumb -- (\*)
+- Operating System > Target OS = linux
+- Operating System > Linux kernel version = 3.2.72 -- Precise kernel
+- C-library > C library = musl
+- C compiler > gcc version = 5.2.0
+- C compiler > C++ = ENABLE -- to cross compile LLVM
+
 ## `aarch64-linux-gnu.config`
 
 For targets: `aarch64-unknown-linux-gnu`
diff --git a/slaves/linux-cross/arm-linux-musleabi.config b/slaves/linux-cross/arm-linux-musleabi.config
new file mode 100644
index 0000000..217fef8
--- /dev/null
+++ b/slaves/linux-cross/arm-linux-musleabi.config
@@ -0,0 +1,527 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# Crosstool-NG Configuration
+#
+CT_CONFIGURE_has_make381=y
+CT_MODULES=y
+
+#
+# Paths and misc options
+#
+
+#
+# crosstool-NG behavior
+#
+# CT_OBSOLETE is not set
+# CT_EXPERIMENTAL is not set
+# CT_DEBUG_CT is not set
+
+#
+# Paths
+#
+CT_LOCAL_TARBALLS_DIR=""
+CT_WORK_DIR="${CT_TOP_DIR}/.build"
+CT_PREFIX_DIR="/x-tools/${CT_TARGET}"
+CT_INSTALL_DIR="${CT_PREFIX_DIR}"
+CT_RM_RF_PREFIX_DIR=y
+CT_REMOVE_DOCS=y
+CT_INSTALL_DIR_RO=y
+CT_STRIP_HOST_TOOLCHAIN_EXECUTABLES=y
+# CT_STRIP_TARGET_TOOLCHAIN_EXECUTABLES is not set
+
+#
+# Downloading
+#
+# CT_FORBID_DOWNLOAD is not set
+# CT_FORCE_DOWNLOAD is not set
+CT_CONNECT_TIMEOUT=10
+# CT_ONLY_DOWNLOAD is not set
+# CT_USE_MIRROR is not set
+
+#
+# Extracting
+#
+# CT_FORCE_EXTRACT is not set
+CT_OVERIDE_CONFIG_GUESS_SUB=y
+# CT_ONLY_EXTRACT is not set
+CT_PATCH_BUNDLED=y
+# CT_PATCH_LOCAL is not set
+# CT_PATCH_BUNDLED_LOCAL is not set
+# CT_PATCH_LOCAL_BUNDLED is not set
+# CT_PATCH_BUNDLED_FALLBACK_LOCAL is not set
+# CT_PATCH_LOCAL_FALLBACK_BUNDLED is not set
+# CT_PATCH_NONE is not set
+CT_PATCH_ORDER="bundled"
+
+#
+# Build behavior
+#
+CT_PARALLEL_JOBS=0
+CT_LOAD=""
+CT_USE_PIPES=y
+CT_EXTRA_CFLAGS_FOR_BUILD=""
+CT_EXTRA_LDFLAGS_FOR_BUILD=""
+CT_EXTRA_CFLAGS_FOR_HOST=""
+CT_EXTRA_LDFLAGS_FOR_HOST=""
+# CT_CONFIG_SHELL_SH is not set
+# CT_CONFIG_SHELL_ASH is not set
+CT_CONFIG_SHELL_BASH=y
+# CT_CONFIG_SHELL_CUSTOM is not set
+CT_CONFIG_SHELL="${bash}"
+
+#
+# Logging
+#
+# CT_LOG_ERROR is not set
+# CT_LOG_WARN is not set
+CT_LOG_INFO=y
+# CT_LOG_EXTRA is not set
+# CT_LOG_ALL is not set
+# CT_LOG_DEBUG is not set
+CT_LOG_LEVEL_MAX="INFO"
+# CT_LOG_SEE_TOOLS_WARN is not set
+CT_LOG_PROGRESS_BAR=y
+CT_LOG_TO_FILE=y
+CT_LOG_FILE_COMPRESS=y
+
+#
+# Target options
+#
+CT_ARCH="arm"
+CT_ARCH_SUPPORTS_BOTH_MMU=y
+CT_ARCH_SUPPORTS_BOTH_ENDIAN=y
+CT_ARCH_SUPPORTS_32=y
+CT_ARCH_SUPPORTS_64=y
+CT_ARCH_SUPPORTS_WITH_ARCH=y
+CT_ARCH_SUPPORTS_WITH_CPU=y
+CT_ARCH_SUPPORTS_WITH_TUNE=y
+CT_ARCH_SUPPORTS_WITH_FLOAT=y
+CT_ARCH_SUPPORTS_WITH_FPU=y
+CT_ARCH_SUPPORTS_SOFTFP=y
+CT_ARCH_DEFAULT_HAS_MMU=y
+CT_ARCH_DEFAULT_LE=y
+CT_ARCH_DEFAULT_32=y
+CT_ARCH_ARCH="armv6"
+CT_ARCH_CPU=""
+CT_ARCH_TUNE=""
+CT_ARCH_FPU=""
+# CT_ARCH_BE is not set
+CT_ARCH_LE=y
+CT_ARCH_32=y
+# CT_ARCH_64 is not set
+CT_ARCH_BITNESS=32
+# CT_ARCH_FLOAT_HW is not set
+CT_ARCH_FLOAT_SW=y
+CT_TARGET_CFLAGS=""
+CT_TARGET_LDFLAGS=""
+# CT_ARCH_alpha is not set
+CT_ARCH_arm=y
+# CT_ARCH_avr is not set
+# CT_ARCH_m68k is not set
+# CT_ARCH_mips is not set
+# CT_ARCH_nios2 is not set
+# CT_ARCH_powerpc is not set
+# CT_ARCH_s390 is not set
+# CT_ARCH_sh is not set
+# CT_ARCH_sparc is not set
+# CT_ARCH_x86 is not set
+# CT_ARCH_xtensa is not set
+CT_ARCH_alpha_AVAILABLE=y
+CT_ARCH_arm_AVAILABLE=y
+CT_ARCH_avr_AVAILABLE=y
+CT_ARCH_m68k_AVAILABLE=y
+CT_ARCH_microblaze_AVAILABLE=y
+CT_ARCH_mips_AVAILABLE=y
+CT_ARCH_nios2_AVAILABLE=y
+CT_ARCH_powerpc_AVAILABLE=y
+CT_ARCH_s390_AVAILABLE=y
+CT_ARCH_sh_AVAILABLE=y
+CT_ARCH_sparc_AVAILABLE=y
+CT_ARCH_x86_AVAILABLE=y
+CT_ARCH_xtensa_AVAILABLE=y
+CT_ARCH_SUFFIX=""
+
+#
+# Generic target options
+#
+# CT_MULTILIB is not set
+CT_ARCH_USE_MMU=y
+CT_ARCH_ENDIAN="little"
+
+#
+# Target optimisations
+#
+CT_ARCH_EXCLUSIVE_WITH_CPU=y
+# CT_ARCH_FLOAT_AUTO is not set
+# CT_ARCH_FLOAT_SOFTFP is not set
+CT_ARCH_FLOAT="soft"
+# CT_ARCH_ALPHA_EV4 is not set
+# CT_ARCH_ALPHA_EV45 is not set
+# CT_ARCH_ALPHA_EV5 is not set
+# CT_ARCH_ALPHA_EV56 is not set
+# CT_ARCH_ALPHA_EV6 is not set
+# CT_ARCH_ALPHA_EV67 is not set
+
+#
+# arm other options
+#
+CT_ARCH_ARM_MODE="arm"
+CT_ARCH_ARM_MODE_ARM=y
+# CT_ARCH_ARM_MODE_THUMB is not set
+# CT_ARCH_ARM_INTERWORKING is not set
+CT_ARCH_ARM_EABI_FORCE=y
+CT_ARCH_ARM_EABI=y
+
+#
+# Toolchain options
+#
+
+#
+# General toolchain options
+#
+CT_FORCE_SYSROOT=y
+CT_USE_SYSROOT=y
+CT_SYSROOT_NAME="sysroot"
+CT_SYSROOT_DIR_PREFIX=""
+CT_WANTS_STATIC_LINK=y
+# CT_STATIC_TOOLCHAIN is not set
+CT_TOOLCHAIN_PKGVERSION=""
+CT_TOOLCHAIN_BUGURL=""
+
+#
+# Tuple completion and aliasing
+#
+CT_TARGET_VENDOR="unknown"
+CT_TARGET_ALIAS_SED_EXPR=""
+CT_TARGET_ALIAS=""
+
+#
+# Toolchain type
+#
+CT_CROSS=y
+# CT_CANADIAN is not set
+CT_TOOLCHAIN_TYPE="cross"
+
+#
+# Build system
+#
+CT_BUILD=""
+CT_BUILD_PREFIX=""
+CT_BUILD_SUFFIX=""
+
+#
+# Misc options
+#
+# CT_TOOLCHAIN_ENABLE_NLS is not set
+
+#
+# Operating System
+#
+CT_KERNEL_SUPPORTS_SHARED_LIBS=y
+CT_KERNEL="linux"
+CT_KERNEL_VERSION="3.2.72"
+# CT_KERNEL_bare_metal is not set
+CT_KERNEL_linux=y
+CT_KERNEL_bare_metal_AVAILABLE=y
+CT_KERNEL_linux_AVAILABLE=y
+# CT_KERNEL_V_4_3 is not set
+# CT_KERNEL_V_4_2 is not set
+# CT_KERNEL_V_4_1 is not set
+# CT_KERNEL_V_3_18 is not set
+# CT_KERNEL_V_3_14 is not set
+# CT_KERNEL_V_3_12 is not set
+# CT_KERNEL_V_3_10 is not set
+# CT_KERNEL_V_3_4 is not set
+CT_KERNEL_V_3_2=y
+# CT_KERNEL_V_2_6_32 is not set
+# CT_KERNEL_LINUX_CUSTOM is not set
+CT_KERNEL_windows_AVAILABLE=y
+
+#
+# Common kernel options
+#
+CT_SHARED_LIBS=y
+
+#
+# linux other options
+#
+CT_KERNEL_LINUX_VERBOSITY_0=y
+# CT_KERNEL_LINUX_VERBOSITY_1 is not set
+# CT_KERNEL_LINUX_VERBOSITY_2 is not set
+CT_KERNEL_LINUX_VERBOSE_LEVEL=0
+CT_KERNEL_LINUX_INSTALL_CHECK=y
+
+#
+# Binary utilities
+#
+CT_ARCH_BINFMT_ELF=y
+CT_BINUTILS="binutils"
+CT_BINUTILS_binutils=y
+
+#
+# GNU binutils
+#
+# CT_CC_BINUTILS_SHOW_LINARO is not set
+CT_BINUTILS_V_2_25_1=y
+# CT_BINUTILS_V_2_25 is not set
+# CT_BINUTILS_V_2_24 is not set
+# CT_BINUTILS_V_2_23_2 is not set
+# CT_BINUTILS_V_2_23_1 is not set
+# CT_BINUTILS_V_2_22 is not set
+# CT_BINUTILS_V_2_21_53 is not set
+# CT_BINUTILS_V_2_21_1a is not set
+# CT_BINUTILS_V_2_20_1a is not set
+# CT_BINUTILS_V_2_19_1a is not set
+# CT_BINUTILS_V_2_18a is not set
+CT_BINUTILS_VERSION="2.25.1"
+CT_BINUTILS_2_25_1_or_later=y
+CT_BINUTILS_2_25_or_later=y
+CT_BINUTILS_2_24_or_later=y
+CT_BINUTILS_2_23_or_later=y
+CT_BINUTILS_2_22_or_later=y
+CT_BINUTILS_2_21_or_later=y
+CT_BINUTILS_2_20_or_later=y
+CT_BINUTILS_2_19_or_later=y
+CT_BINUTILS_2_18_or_later=y
+CT_BINUTILS_HAS_HASH_STYLE=y
+CT_BINUTILS_HAS_GOLD=y
+CT_BINUTILS_GOLD_SUPPORTS_ARCH=y
+CT_BINUTILS_GOLD_SUPPORT=y
+CT_BINUTILS_HAS_PLUGINS=y
+CT_BINUTILS_HAS_PKGVERSION_BUGURL=y
+CT_BINUTILS_LINKER_LD=y
+# CT_BINUTILS_LINKER_GOLD is not set
+# CT_BINUTILS_LINKER_LD_GOLD is not set
+# CT_BINUTILS_LINKER_GOLD_LD is not set
+CT_BINUTILS_LINKERS_LIST="ld"
+CT_BINUTILS_LINKER_DEFAULT="bfd"
+# CT_BINUTILS_PLUGINS is not set
+CT_BINUTILS_EXTRA_CONFIG_ARRAY=""
+# CT_BINUTILS_FOR_TARGET is not set
+
+#
+# binutils other options
+#
+
+#
+# C-library
+#
+CT_LIBC="musl"
+CT_LIBC_VERSION="1.0.5"
+# CT_LIBC_glibc is not set
+CT_LIBC_musl=y
+# CT_LIBC_newlib is not set
+# CT_LIBC_none is not set
+# CT_LIBC_uClibc is not set
+CT_LIBC_avr_libc_AVAILABLE=y
+CT_LIBC_glibc_AVAILABLE=y
+CT_THREADS="musl"
+# CT_LIBC_GLIBC_V_2_22 is not set
+# CT_LIBC_GLIBC_V_2_21 is not set
+# CT_LIBC_GLIBC_V_2_20 is not set
+# CT_LIBC_GLIBC_V_2_19 is not set
+# CT_LIBC_GLIBC_V_2_18 is not set
+# CT_LIBC_GLIBC_V_2_17 is not set
+# CT_LIBC_GLIBC_V_2_16_0 is not set
+# CT_LIBC_GLIBC_V_2_15 is not set
+# CT_LIBC_GLIBC_V_2_14_1 is not set
+# CT_LIBC_GLIBC_V_2_14 is not set
+# CT_LIBC_GLIBC_V_2_13 is not set
+# CT_LIBC_GLIBC_V_2_12_2 is not set
+# CT_LIBC_GLIBC_V_2_12_1 is not set
+# CT_LIBC_GLIBC_V_2_11_1 is not set
+# CT_LIBC_GLIBC_V_2_11 is not set
+# CT_LIBC_GLIBC_V_2_10_1 is not set
+# CT_LIBC_GLIBC_V_2_9 is not set
+# CT_LIBC_GLIBC_V_2_8 is not set
+CT_LIBC_mingw_AVAILABLE=y
+CT_LIBC_musl_AVAILABLE=y
+CT_LIBC_MUSL_V_1_0=y
+CT_LIBC_newlib_AVAILABLE=y
+CT_LIBC_none_AVAILABLE=y
+CT_LIBC_uClibc_AVAILABLE=y
+CT_LIBC_SUPPORT_THREADS_ANY=y
+CT_LIBC_SUPPORT_THREADS_NATIVE=y
+
+#
+# Common C library options
+#
+CT_THREADS_NATIVE=y
+CT_LIBC_XLDD=y
+# CT_LIBC_GLIBC_KERNEL_VERSION_NONE is not set
+# CT_LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS is not set
+# CT_LIBC_GLIBC_KERNEL_VERSION_CHOSEN is not set
+
+#
+# musl other options
+#
+# CT_LIBC_MUSL_DEBUG is not set
+# CT_LIBC_MUSL_WARNINGS is not set
+# CT_LIBC_MUSL_OPTIMIZE_NONE is not set
+CT_LIBC_MUSL_OPTIMIZE_AUTO=y
+# CT_LIBC_MUSL_OPTIMIZE_SPEED is not set
+# CT_LIBC_MUSL_OPTIMIZE_SIZE is not set
+CT_LIBC_MUSL_OPTIMIZE="auto"
+
+#
+# C compiler
+#
+CT_CC="gcc"
+CT_CC_CORE_PASSES_NEEDED=y
+CT_CC_CORE_PASS_1_NEEDED=y
+CT_CC_CORE_PASS_2_NEEDED=y
+CT_CC_gcc=y
+# CT_CC_GCC_SHOW_LINARO is not set
+CT_CC_GCC_V_5_2_0=y
+# CT_CC_GCC_V_4_9_3 is not set
+# CT_CC_GCC_V_4_8_5 is not set
+# CT_CC_GCC_V_4_7_4 is not set
+# CT_CC_GCC_V_4_6_4 is not set
+# CT_CC_GCC_V_4_5_4 is not set
+# CT_CC_GCC_V_4_4_7 is not set
+# CT_CC_GCC_V_4_3_6 is not set
+# CT_CC_GCC_V_4_2_4 is not set
+CT_CC_GCC_4_2_or_later=y
+CT_CC_GCC_4_3_or_later=y
+CT_CC_GCC_4_4_or_later=y
+CT_CC_GCC_4_5_or_later=y
+CT_CC_GCC_4_6_or_later=y
+CT_CC_GCC_4_7_or_later=y
+CT_CC_GCC_4_8_or_later=y
+CT_CC_GCC_4_9_or_later=y
+CT_CC_GCC_5=y
+CT_CC_GCC_5_or_later=y
+CT_CC_GCC_HAS_GRAPHITE=y
+CT_CC_GCC_USE_GRAPHITE=y
+CT_CC_GCC_HAS_LTO=y
+CT_CC_GCC_USE_LTO=y
+CT_CC_GCC_HAS_PKGVERSION_BUGURL=y
+CT_CC_GCC_HAS_BUILD_ID=y
+CT_CC_GCC_HAS_LNK_HASH_STYLE=y
+CT_CC_GCC_USE_GMP_MPFR=y
+CT_CC_GCC_USE_MPC=y
+CT_CC_GCC_HAS_LIBQUADMATH=y
+CT_CC_GCC_HAS_LIBSANITIZER=y
+CT_CC_GCC_VERSION="5.2.0"
+# CT_CC_LANG_FORTRAN is not set
+CT_CC_GCC_ENABLE_CXX_FLAGS=""
+CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_EXTRA_ENV_ARRAY=""
+CT_CC_GCC_STATIC_LIBSTDCXX=y
+# CT_CC_GCC_SYSTEM_ZLIB is not set
+
+#
+# Optimisation features
+#
+
+#
+# Settings for libraries running on target
+#
+CT_CC_GCC_ENABLE_TARGET_OPTSPACE=y
+# CT_CC_GCC_LIBMUDFLAP is not set
+# CT_CC_GCC_LIBGOMP is not set
+# CT_CC_GCC_LIBSSP is not set
+# CT_CC_GCC_LIBQUADMATH is not set
+
+#
+# Misc. obscure options.
+#
+CT_CC_CXA_ATEXIT=y
+# CT_CC_GCC_DISABLE_PCH is not set
+CT_CC_GCC_SJLJ_EXCEPTIONS=m
+CT_CC_GCC_LDBL_128=m
+# CT_CC_GCC_BUILD_ID is not set
+CT_CC_GCC_LNK_HASH_STYLE_DEFAULT=y
+# CT_CC_GCC_LNK_HASH_STYLE_SYSV is not set
+# CT_CC_GCC_LNK_HASH_STYLE_GNU is not set
+# CT_CC_GCC_LNK_HASH_STYLE_BOTH is not set
+CT_CC_GCC_LNK_HASH_STYLE=""
+CT_CC_GCC_DEC_FLOAT_AUTO=y
+# CT_CC_GCC_DEC_FLOAT_BID is not set
+# CT_CC_GCC_DEC_FLOAT_DPD is not set
+# CT_CC_GCC_DEC_FLOATS_NO is not set
+CT_CC_SUPPORT_CXX=y
+CT_CC_SUPPORT_FORTRAN=y
+CT_CC_SUPPORT_JAVA=y
+CT_CC_SUPPORT_ADA=y
+CT_CC_SUPPORT_OBJC=y
+CT_CC_SUPPORT_OBJCXX=y
+CT_CC_SUPPORT_GOLANG=y
+
+#
+# Additional supported languages:
+#
+CT_CC_LANG_CXX=y
+# CT_CC_LANG_JAVA is not set
+
+#
+# Debug facilities
+#
+# CT_DEBUG_dmalloc is not set
+# CT_DEBUG_duma is not set
+# CT_DEBUG_gdb is not set
+# CT_DEBUG_ltrace is not set
+# CT_DEBUG_strace is not set
+
+#
+# Companion libraries
+#
+CT_COMPLIBS_NEEDED=y
+CT_GMP_NEEDED=y
+CT_MPFR_NEEDED=y
+CT_ISL_NEEDED=y
+CT_MPC_NEEDED=y
+CT_COMPLIBS=y
+CT_GMP=y
+CT_MPFR=y
+CT_ISL=y
+CT_MPC=y
+# CT_LIBICONV_V_1_14 is not set
+CT_GMP_V_6_0_0=y
+# CT_GMP_V_5_1_3 is not set
+# CT_GMP_V_5_1_1 is not set
+# CT_GMP_V_5_0_2 is not set
+# CT_GMP_V_5_0_1 is not set
+# CT_GMP_V_4_3_2 is not set
+# CT_GMP_V_4_3_1 is not set
+# CT_GMP_V_4_3_0 is not set
+CT_GMP_5_0_2_or_later=y
+CT_GMP_VERSION="6.0.0a"
+CT_MPFR_V_3_1_3=y
+# CT_MPFR_V_3_1_2 is not set
+# CT_MPFR_V_3_1_0 is not set
+# CT_MPFR_V_3_0_1 is not set
+# CT_MPFR_V_3_0_0 is not set
+# CT_MPFR_V_2_4_2 is not set
+# CT_MPFR_V_2_4_1 is not set
+# CT_MPFR_V_2_4_0 is not set
+CT_MPFR_VERSION="3.1.3"
+CT_ISL_V_0_14=y
+# CT_ISL_V_0_12_2 is not set
+CT_ISL_V_0_14_or_later=y
+CT_ISL_V_0_12_or_later=y
+CT_ISL_VERSION="0.14"
+CT_MPC_V_1_0_3=y
+# CT_MPC_V_1_0_2 is not set
+# CT_MPC_V_1_0_1 is not set
+# CT_MPC_V_1_0 is not set
+# CT_MPC_V_0_9 is not set
+# CT_MPC_V_0_8_2 is not set
+# CT_MPC_V_0_8_1 is not set
+# CT_MPC_V_0_7 is not set
+CT_MPC_VERSION="1.0.3"
+
+#
+# Companion libraries common options
+#
+# CT_COMPLIBS_CHECK is not set
+
+#
+# Companion tools
+#
+
+#
+# READ HELP before you say 'Y' below !!!
+#
+# CT_COMP_TOOLS is not set
diff --git a/slaves/linux-cross/arm-linux-musleabihf.config b/slaves/linux-cross/arm-linux-musleabihf.config
new file mode 100644
index 0000000..880c1e9
--- /dev/null
+++ b/slaves/linux-cross/arm-linux-musleabihf.config
@@ -0,0 +1,528 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# Crosstool-NG Configuration
+#
+CT_CONFIGURE_has_make381=y
+CT_MODULES=y
+
+#
+# Paths and misc options
+#
+
+#
+# crosstool-NG behavior
+#
+# CT_OBSOLETE is not set
+# CT_EXPERIMENTAL is not set
+# CT_DEBUG_CT is not set
+
+#
+# Paths
+#
+CT_LOCAL_TARBALLS_DIR=""
+CT_WORK_DIR="${CT_TOP_DIR}/.build"
+CT_PREFIX_DIR="/x-tools/${CT_TARGET}"
+CT_INSTALL_DIR="${CT_PREFIX_DIR}"
+CT_RM_RF_PREFIX_DIR=y
+CT_REMOVE_DOCS=y
+CT_INSTALL_DIR_RO=y
+CT_STRIP_HOST_TOOLCHAIN_EXECUTABLES=y
+# CT_STRIP_TARGET_TOOLCHAIN_EXECUTABLES is not set
+
+#
+# Downloading
+#
+# CT_FORBID_DOWNLOAD is not set
+# CT_FORCE_DOWNLOAD is not set
+CT_CONNECT_TIMEOUT=10
+# CT_ONLY_DOWNLOAD is not set
+# CT_USE_MIRROR is not set
+
+#
+# Extracting
+#
+# CT_FORCE_EXTRACT is not set
+CT_OVERIDE_CONFIG_GUESS_SUB=y
+# CT_ONLY_EXTRACT is not set
+CT_PATCH_BUNDLED=y
+# CT_PATCH_LOCAL is not set
+# CT_PATCH_BUNDLED_LOCAL is not set
+# CT_PATCH_LOCAL_BUNDLED is not set
+# CT_PATCH_BUNDLED_FALLBACK_LOCAL is not set
+# CT_PATCH_LOCAL_FALLBACK_BUNDLED is not set
+# CT_PATCH_NONE is not set
+CT_PATCH_ORDER="bundled"
+
+#
+# Build behavior
+#
+CT_PARALLEL_JOBS=0
+CT_LOAD=""
+CT_USE_PIPES=y
+CT_EXTRA_CFLAGS_FOR_BUILD=""
+CT_EXTRA_LDFLAGS_FOR_BUILD=""
+CT_EXTRA_CFLAGS_FOR_HOST=""
+CT_EXTRA_LDFLAGS_FOR_HOST=""
+# CT_CONFIG_SHELL_SH is not set
+# CT_CONFIG_SHELL_ASH is not set
+CT_CONFIG_SHELL_BASH=y
+# CT_CONFIG_SHELL_CUSTOM is not set
+CT_CONFIG_SHELL="${bash}"
+
+#
+# Logging
+#
+# CT_LOG_ERROR is not set
+# CT_LOG_WARN is not set
+CT_LOG_INFO=y
+# CT_LOG_EXTRA is not set
+# CT_LOG_ALL is not set
+# CT_LOG_DEBUG is not set
+CT_LOG_LEVEL_MAX="INFO"
+# CT_LOG_SEE_TOOLS_WARN is not set
+CT_LOG_PROGRESS_BAR=y
+CT_LOG_TO_FILE=y
+CT_LOG_FILE_COMPRESS=y
+
+#
+# Target options
+#
+CT_ARCH="arm"
+CT_ARCH_SUPPORTS_BOTH_MMU=y
+CT_ARCH_SUPPORTS_BOTH_ENDIAN=y
+CT_ARCH_SUPPORTS_32=y
+CT_ARCH_SUPPORTS_64=y
+CT_ARCH_SUPPORTS_WITH_ARCH=y
+CT_ARCH_SUPPORTS_WITH_CPU=y
+CT_ARCH_SUPPORTS_WITH_TUNE=y
+CT_ARCH_SUPPORTS_WITH_FLOAT=y
+CT_ARCH_SUPPORTS_WITH_FPU=y
+CT_ARCH_SUPPORTS_SOFTFP=y
+CT_ARCH_DEFAULT_HAS_MMU=y
+CT_ARCH_DEFAULT_LE=y
+CT_ARCH_DEFAULT_32=y
+CT_ARCH_ARCH="armv6"
+CT_ARCH_CPU=""
+CT_ARCH_TUNE=""
+CT_ARCH_FPU="vfp"
+# CT_ARCH_BE is not set
+CT_ARCH_LE=y
+CT_ARCH_32=y
+# CT_ARCH_64 is not set
+CT_ARCH_BITNESS=32
+CT_ARCH_FLOAT_HW=y
+# CT_ARCH_FLOAT_SW is not set
+CT_TARGET_CFLAGS=""
+CT_TARGET_LDFLAGS=""
+# CT_ARCH_alpha is not set
+CT_ARCH_arm=y
+# CT_ARCH_avr is not set
+# CT_ARCH_m68k is not set
+# CT_ARCH_mips is not set
+# CT_ARCH_nios2 is not set
+# CT_ARCH_powerpc is not set
+# CT_ARCH_s390 is not set
+# CT_ARCH_sh is not set
+# CT_ARCH_sparc is not set
+# CT_ARCH_x86 is not set
+# CT_ARCH_xtensa is not set
+CT_ARCH_alpha_AVAILABLE=y
+CT_ARCH_arm_AVAILABLE=y
+CT_ARCH_avr_AVAILABLE=y
+CT_ARCH_m68k_AVAILABLE=y
+CT_ARCH_microblaze_AVAILABLE=y
+CT_ARCH_mips_AVAILABLE=y
+CT_ARCH_nios2_AVAILABLE=y
+CT_ARCH_powerpc_AVAILABLE=y
+CT_ARCH_s390_AVAILABLE=y
+CT_ARCH_sh_AVAILABLE=y
+CT_ARCH_sparc_AVAILABLE=y
+CT_ARCH_x86_AVAILABLE=y
+CT_ARCH_xtensa_AVAILABLE=y
+CT_ARCH_SUFFIX=""
+
+#
+# Generic target options
+#
+# CT_MULTILIB is not set
+CT_ARCH_USE_MMU=y
+CT_ARCH_ENDIAN="little"
+
+#
+# Target optimisations
+#
+CT_ARCH_EXCLUSIVE_WITH_CPU=y
+# CT_ARCH_FLOAT_AUTO is not set
+# CT_ARCH_FLOAT_SOFTFP is not set
+CT_ARCH_FLOAT="hard"
+# CT_ARCH_ALPHA_EV4 is not set
+# CT_ARCH_ALPHA_EV45 is not set
+# CT_ARCH_ALPHA_EV5 is not set
+# CT_ARCH_ALPHA_EV56 is not set
+# CT_ARCH_ALPHA_EV6 is not set
+# CT_ARCH_ALPHA_EV67 is not set
+
+#
+# arm other options
+#
+CT_ARCH_ARM_MODE="arm"
+CT_ARCH_ARM_MODE_ARM=y
+# CT_ARCH_ARM_MODE_THUMB is not set
+# CT_ARCH_ARM_INTERWORKING is not set
+CT_ARCH_ARM_EABI_FORCE=y
+CT_ARCH_ARM_EABI=y
+CT_ARCH_ARM_TUPLE_USE_EABIHF=y
+
+#
+# Toolchain options
+#
+
+#
+# General toolchain options
+#
+CT_FORCE_SYSROOT=y
+CT_USE_SYSROOT=y
+CT_SYSROOT_NAME="sysroot"
+CT_SYSROOT_DIR_PREFIX=""
+CT_WANTS_STATIC_LINK=y
+# CT_STATIC_TOOLCHAIN is not set
+CT_TOOLCHAIN_PKGVERSION=""
+CT_TOOLCHAIN_BUGURL=""
+
+#
+# Tuple completion and aliasing
+#
+CT_TARGET_VENDOR="unknown"
+CT_TARGET_ALIAS_SED_EXPR=""
+CT_TARGET_ALIAS=""
+
+#
+# Toolchain type
+#
+CT_CROSS=y
+# CT_CANADIAN is not set
+CT_TOOLCHAIN_TYPE="cross"
+
+#
+# Build system
+#
+CT_BUILD=""
+CT_BUILD_PREFIX=""
+CT_BUILD_SUFFIX=""
+
+#
+# Misc options
+#
+# CT_TOOLCHAIN_ENABLE_NLS is not set
+
+#
+# Operating System
+#
+CT_KERNEL_SUPPORTS_SHARED_LIBS=y
+CT_KERNEL="linux"
+CT_KERNEL_VERSION="3.2.72"
+# CT_KERNEL_bare_metal is not set
+CT_KERNEL_linux=y
+CT_KERNEL_bare_metal_AVAILABLE=y
+CT_KERNEL_linux_AVAILABLE=y
+# CT_KERNEL_V_4_3 is not set
+# CT_KERNEL_V_4_2 is not set
+# CT_KERNEL_V_4_1 is not set
+# CT_KERNEL_V_3_18 is not set
+# CT_KERNEL_V_3_14 is not set
+# CT_KERNEL_V_3_12 is not set
+# CT_KERNEL_V_3_10 is not set
+# CT_KERNEL_V_3_4 is not set
+CT_KERNEL_V_3_2=y
+# CT_KERNEL_V_2_6_32 is not set
+# CT_KERNEL_LINUX_CUSTOM is not set
+CT_KERNEL_windows_AVAILABLE=y
+
+#
+# Common kernel options
+#
+CT_SHARED_LIBS=y
+
+#
+# linux other options
+#
+CT_KERNEL_LINUX_VERBOSITY_0=y
+# CT_KERNEL_LINUX_VERBOSITY_1 is not set
+# CT_KERNEL_LINUX_VERBOSITY_2 is not set
+CT_KERNEL_LINUX_VERBOSE_LEVEL=0
+CT_KERNEL_LINUX_INSTALL_CHECK=y
+
+#
+# Binary utilities
+#
+CT_ARCH_BINFMT_ELF=y
+CT_BINUTILS="binutils"
+CT_BINUTILS_binutils=y
+
+#
+# GNU binutils
+#
+# CT_CC_BINUTILS_SHOW_LINARO is not set
+CT_BINUTILS_V_2_25_1=y
+# CT_BINUTILS_V_2_25 is not set
+# CT_BINUTILS_V_2_24 is not set
+# CT_BINUTILS_V_2_23_2 is not set
+# CT_BINUTILS_V_2_23_1 is not set
+# CT_BINUTILS_V_2_22 is not set
+# CT_BINUTILS_V_2_21_53 is not set
+# CT_BINUTILS_V_2_21_1a is not set
+# CT_BINUTILS_V_2_20_1a is not set
+# CT_BINUTILS_V_2_19_1a is not set
+# CT_BINUTILS_V_2_18a is not set
+CT_BINUTILS_VERSION="2.25.1"
+CT_BINUTILS_2_25_1_or_later=y
+CT_BINUTILS_2_25_or_later=y
+CT_BINUTILS_2_24_or_later=y
+CT_BINUTILS_2_23_or_later=y
+CT_BINUTILS_2_22_or_later=y
+CT_BINUTILS_2_21_or_later=y
+CT_BINUTILS_2_20_or_later=y
+CT_BINUTILS_2_19_or_later=y
+CT_BINUTILS_2_18_or_later=y
+CT_BINUTILS_HAS_HASH_STYLE=y
+CT_BINUTILS_HAS_GOLD=y
+CT_BINUTILS_GOLD_SUPPORTS_ARCH=y
+CT_BINUTILS_GOLD_SUPPORT=y
+CT_BINUTILS_HAS_PLUGINS=y
+CT_BINUTILS_HAS_PKGVERSION_BUGURL=y
+CT_BINUTILS_LINKER_LD=y
+# CT_BINUTILS_LINKER_GOLD is not set
+# CT_BINUTILS_LINKER_LD_GOLD is not set
+# CT_BINUTILS_LINKER_GOLD_LD is not set
+CT_BINUTILS_LINKERS_LIST="ld"
+CT_BINUTILS_LINKER_DEFAULT="bfd"
+# CT_BINUTILS_PLUGINS is not set
+CT_BINUTILS_EXTRA_CONFIG_ARRAY=""
+# CT_BINUTILS_FOR_TARGET is not set
+
+#
+# binutils other options
+#
+
+#
+# C-library
+#
+CT_LIBC="musl"
+CT_LIBC_VERSION="1.0.5"
+# CT_LIBC_glibc is not set
+CT_LIBC_musl=y
+# CT_LIBC_newlib is not set
+# CT_LIBC_none is not set
+# CT_LIBC_uClibc is not set
+CT_LIBC_avr_libc_AVAILABLE=y
+CT_LIBC_glibc_AVAILABLE=y
+CT_THREADS="musl"
+# CT_LIBC_GLIBC_V_2_22 is not set
+# CT_LIBC_GLIBC_V_2_21 is not set
+# CT_LIBC_GLIBC_V_2_20 is not set
+# CT_LIBC_GLIBC_V_2_19 is not set
+# CT_LIBC_GLIBC_V_2_18 is not set
+# CT_LIBC_GLIBC_V_2_17 is not set
+# CT_LIBC_GLIBC_V_2_16_0 is not set
+# CT_LIBC_GLIBC_V_2_15 is not set
+# CT_LIBC_GLIBC_V_2_14_1 is not set
+# CT_LIBC_GLIBC_V_2_14 is not set
+# CT_LIBC_GLIBC_V_2_13 is not set
+# CT_LIBC_GLIBC_V_2_12_2 is not set
+# CT_LIBC_GLIBC_V_2_12_1 is not set
+# CT_LIBC_GLIBC_V_2_11_1 is not set
+# CT_LIBC_GLIBC_V_2_11 is not set
+# CT_LIBC_GLIBC_V_2_10_1 is not set
+# CT_LIBC_GLIBC_V_2_9 is not set
+# CT_LIBC_GLIBC_V_2_8 is not set
+CT_LIBC_mingw_AVAILABLE=y
+CT_LIBC_musl_AVAILABLE=y
+CT_LIBC_MUSL_V_1_0=y
+CT_LIBC_newlib_AVAILABLE=y
+CT_LIBC_none_AVAILABLE=y
+CT_LIBC_uClibc_AVAILABLE=y
+CT_LIBC_SUPPORT_THREADS_ANY=y
+CT_LIBC_SUPPORT_THREADS_NATIVE=y
+
+#
+# Common C library options
+#
+CT_THREADS_NATIVE=y
+CT_LIBC_XLDD=y
+# CT_LIBC_GLIBC_KERNEL_VERSION_NONE is not set
+# CT_LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS is not set
+# CT_LIBC_GLIBC_KERNEL_VERSION_CHOSEN is not set
+
+#
+# musl other options
+#
+# CT_LIBC_MUSL_DEBUG is not set
+# CT_LIBC_MUSL_WARNINGS is not set
+# CT_LIBC_MUSL_OPTIMIZE_NONE is not set
+CT_LIBC_MUSL_OPTIMIZE_AUTO=y
+# CT_LIBC_MUSL_OPTIMIZE_SPEED is not set
+# CT_LIBC_MUSL_OPTIMIZE_SIZE is not set
+CT_LIBC_MUSL_OPTIMIZE="auto"
+
+#
+# C compiler
+#
+CT_CC="gcc"
+CT_CC_CORE_PASSES_NEEDED=y
+CT_CC_CORE_PASS_1_NEEDED=y
+CT_CC_CORE_PASS_2_NEEDED=y
+CT_CC_gcc=y
+# CT_CC_GCC_SHOW_LINARO is not set
+CT_CC_GCC_V_5_2_0=y
+# CT_CC_GCC_V_4_9_3 is not set
+# CT_CC_GCC_V_4_8_5 is not set
+# CT_CC_GCC_V_4_7_4 is not set
+# CT_CC_GCC_V_4_6_4 is not set
+# CT_CC_GCC_V_4_5_4 is not set
+# CT_CC_GCC_V_4_4_7 is not set
+# CT_CC_GCC_V_4_3_6 is not set
+# CT_CC_GCC_V_4_2_4 is not set
+CT_CC_GCC_4_2_or_later=y
+CT_CC_GCC_4_3_or_later=y
+CT_CC_GCC_4_4_or_later=y
+CT_CC_GCC_4_5_or_later=y
+CT_CC_GCC_4_6_or_later=y
+CT_CC_GCC_4_7_or_later=y
+CT_CC_GCC_4_8_or_later=y
+CT_CC_GCC_4_9_or_later=y
+CT_CC_GCC_5=y
+CT_CC_GCC_5_or_later=y
+CT_CC_GCC_HAS_GRAPHITE=y
+CT_CC_GCC_USE_GRAPHITE=y
+CT_CC_GCC_HAS_LTO=y
+CT_CC_GCC_USE_LTO=y
+CT_CC_GCC_HAS_PKGVERSION_BUGURL=y
+CT_CC_GCC_HAS_BUILD_ID=y
+CT_CC_GCC_HAS_LNK_HASH_STYLE=y
+CT_CC_GCC_USE_GMP_MPFR=y
+CT_CC_GCC_USE_MPC=y
+CT_CC_GCC_HAS_LIBQUADMATH=y
+CT_CC_GCC_HAS_LIBSANITIZER=y
+CT_CC_GCC_VERSION="5.2.0"
+# CT_CC_LANG_FORTRAN is not set
+CT_CC_GCC_ENABLE_CXX_FLAGS=""
+CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_EXTRA_ENV_ARRAY=""
+CT_CC_GCC_STATIC_LIBSTDCXX=y
+# CT_CC_GCC_SYSTEM_ZLIB is not set
+
+#
+# Optimisation features
+#
+
+#
+# Settings for libraries running on target
+#
+CT_CC_GCC_ENABLE_TARGET_OPTSPACE=y
+# CT_CC_GCC_LIBMUDFLAP is not set
+# CT_CC_GCC_LIBGOMP is not set
+# CT_CC_GCC_LIBSSP is not set
+# CT_CC_GCC_LIBQUADMATH is not set
+
+#
+# Misc. obscure options.
+#
+CT_CC_CXA_ATEXIT=y
+# CT_CC_GCC_DISABLE_PCH is not set
+CT_CC_GCC_SJLJ_EXCEPTIONS=m
+CT_CC_GCC_LDBL_128=m
+# CT_CC_GCC_BUILD_ID is not set
+CT_CC_GCC_LNK_HASH_STYLE_DEFAULT=y
+# CT_CC_GCC_LNK_HASH_STYLE_SYSV is not set
+# CT_CC_GCC_LNK_HASH_STYLE_GNU is not set
+# CT_CC_GCC_LNK_HASH_STYLE_BOTH is not set
+CT_CC_GCC_LNK_HASH_STYLE=""
+CT_CC_GCC_DEC_FLOAT_AUTO=y
+# CT_CC_GCC_DEC_FLOAT_BID is not set
+# CT_CC_GCC_DEC_FLOAT_DPD is not set
+# CT_CC_GCC_DEC_FLOATS_NO is not set
+CT_CC_SUPPORT_CXX=y
+CT_CC_SUPPORT_FORTRAN=y
+CT_CC_SUPPORT_JAVA=y
+CT_CC_SUPPORT_ADA=y
+CT_CC_SUPPORT_OBJC=y
+CT_CC_SUPPORT_OBJCXX=y
+CT_CC_SUPPORT_GOLANG=y
+
+#
+# Additional supported languages:
+#
+CT_CC_LANG_CXX=y
+# CT_CC_LANG_JAVA is not set
+
+#
+# Debug facilities
+#
+# CT_DEBUG_dmalloc is not set
+# CT_DEBUG_duma is not set
+# CT_DEBUG_gdb is not set
+# CT_DEBUG_ltrace is not set
+# CT_DEBUG_strace is not set
+
+#
+# Companion libraries
+#
+CT_COMPLIBS_NEEDED=y
+CT_GMP_NEEDED=y
+CT_MPFR_NEEDED=y
+CT_ISL_NEEDED=y
+CT_MPC_NEEDED=y
+CT_COMPLIBS=y
+CT_GMP=y
+CT_MPFR=y
+CT_ISL=y
+CT_MPC=y
+# CT_LIBICONV_V_1_14 is not set
+CT_GMP_V_6_0_0=y
+# CT_GMP_V_5_1_3 is not set
+# CT_GMP_V_5_1_1 is not set
+# CT_GMP_V_5_0_2 is not set
+# CT_GMP_V_5_0_1 is not set
+# CT_GMP_V_4_3_2 is not set
+# CT_GMP_V_4_3_1 is not set
+# CT_GMP_V_4_3_0 is not set
+CT_GMP_5_0_2_or_later=y
+CT_GMP_VERSION="6.0.0a"
+CT_MPFR_V_3_1_3=y
+# CT_MPFR_V_3_1_2 is not set
+# CT_MPFR_V_3_1_0 is not set
+# CT_MPFR_V_3_0_1 is not set
+# CT_MPFR_V_3_0_0 is not set
+# CT_MPFR_V_2_4_2 is not set
+# CT_MPFR_V_2_4_1 is not set
+# CT_MPFR_V_2_4_0 is not set
+CT_MPFR_VERSION="3.1.3"
+CT_ISL_V_0_14=y
+# CT_ISL_V_0_12_2 is not set
+CT_ISL_V_0_14_or_later=y
+CT_ISL_V_0_12_or_later=y
+CT_ISL_VERSION="0.14"
+CT_MPC_V_1_0_3=y
+# CT_MPC_V_1_0_2 is not set
+# CT_MPC_V_1_0_1 is not set
+# CT_MPC_V_1_0 is not set
+# CT_MPC_V_0_9 is not set
+# CT_MPC_V_0_8_2 is not set
+# CT_MPC_V_0_8_1 is not set
+# CT_MPC_V_0_7 is not set
+CT_MPC_VERSION="1.0.3"
+
+#
+# Companion libraries common options
+#
+# CT_COMPLIBS_CHECK is not set
+
+#
+# Companion tools
+#
+
+#
+# READ HELP before you say 'Y' below !!!
+#
+# CT_COMP_TOOLS is not set
diff --git a/slaves/linux-cross/armv7-linux-musleabihf.config b/slaves/linux-cross/armv7-linux-musleabihf.config
new file mode 100644
index 0000000..174a412
--- /dev/null
+++ b/slaves/linux-cross/armv7-linux-musleabihf.config
@@ -0,0 +1,522 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# Crosstool-NG Configuration
+#
+CT_CONFIGURE_has_make381=y
+CT_MODULES=y
+
+#
+# Paths and misc options
+#
+
+#
+# crosstool-NG behavior
+#
+# CT_OBSOLETE is not set
+# CT_EXPERIMENTAL is not set
+# CT_DEBUG_CT is not set
+
+#
+# Paths
+#
+CT_LOCAL_TARBALLS_DIR=""
+CT_WORK_DIR="${CT_TOP_DIR}/.build"
+CT_PREFIX_DIR="/x-tools/${CT_TARGET}"
+CT_INSTALL_DIR="${CT_PREFIX_DIR}"
+CT_RM_RF_PREFIX_DIR=y
+CT_REMOVE_DOCS=y
+CT_INSTALL_DIR_RO=y
+CT_STRIP_HOST_TOOLCHAIN_EXECUTABLES=y
+# CT_STRIP_TARGET_TOOLCHAIN_EXECUTABLES is not set
+
+#
+# Downloading
+#
+# CT_FORBID_DOWNLOAD is not set
+# CT_FORCE_DOWNLOAD is not set
+CT_CONNECT_TIMEOUT=10
+# CT_ONLY_DOWNLOAD is not set
+# CT_USE_MIRROR is not set
+
+#
+# Extracting
+#
+# CT_FORCE_EXTRACT is not set
+CT_OVERIDE_CONFIG_GUESS_SUB=y
+# CT_ONLY_EXTRACT is not set
+CT_PATCH_BUNDLED=y
+# CT_PATCH_LOCAL is not set
+# CT_PATCH_BUNDLED_LOCAL is not set
+# CT_PATCH_LOCAL_BUNDLED is not set
+# CT_PATCH_BUNDLED_FALLBACK_LOCAL is not set
+# CT_PATCH_LOCAL_FALLBACK_BUNDLED is not set
+# CT_PATCH_NONE is not set
+CT_PATCH_ORDER="bundled"
+
+#
+# Build behavior
+#
+CT_PARALLEL_JOBS=0
+CT_LOAD=""
+CT_USE_PIPES=y
+CT_EXTRA_CFLAGS_FOR_BUILD=""
+CT_EXTRA_LDFLAGS_FOR_BUILD=""
+CT_EXTRA_CFLAGS_FOR_HOST=""
+CT_EXTRA_LDFLAGS_FOR_HOST=""
+# CT_CONFIG_SHELL_SH is not set
+# CT_CONFIG_SHELL_ASH is not set
+CT_CONFIG_SHELL_BASH=y
+# CT_CONFIG_SHELL_CUSTOM is not set
+CT_CONFIG_SHELL="${bash}"
+
+#
+# Logging
+#
+# CT_LOG_ERROR is not set
+# CT_LOG_WARN is not set
+CT_LOG_INFO=y
+# CT_LOG_EXTRA is not set
+# CT_LOG_ALL is not set
+# CT_LOG_DEBUG is not set
+CT_LOG_LEVEL_MAX="INFO"
+# CT_LOG_SEE_TOOLS_WARN is not set
+CT_LOG_PROGRESS_BAR=y
+CT_LOG_TO_FILE=y
+CT_LOG_FILE_COMPRESS=y
+
+#
+# Target options
+#
+CT_ARCH="arm"
+CT_ARCH_SUPPORTS_BOTH_MMU=y
+CT_ARCH_SUPPORTS_BOTH_ENDIAN=y
+CT_ARCH_SUPPORTS_32=y
+CT_ARCH_SUPPORTS_64=y
+CT_ARCH_SUPPORTS_WITH_ARCH=y
+CT_ARCH_SUPPORTS_WITH_CPU=y
+CT_ARCH_SUPPORTS_WITH_TUNE=y
+CT_ARCH_SUPPORTS_WITH_FLOAT=y
+CT_ARCH_SUPPORTS_WITH_FPU=y
+CT_ARCH_SUPPORTS_SOFTFP=y
+CT_ARCH_DEFAULT_HAS_MMU=y
+CT_ARCH_DEFAULT_LE=y
+CT_ARCH_DEFAULT_32=y
+CT_ARCH_ARCH="armv7-a"
+CT_ARCH_CPU=""
+CT_ARCH_TUNE=""
+CT_ARCH_FPU="vfpv3-d16"
+# CT_ARCH_BE is not set
+CT_ARCH_LE=y
+CT_ARCH_32=y
+# CT_ARCH_64 is not set
+CT_ARCH_BITNESS=32
+CT_ARCH_FLOAT_HW=y
+# CT_ARCH_FLOAT_SW is not set
+CT_TARGET_CFLAGS=""
+CT_TARGET_LDFLAGS=""
+# CT_ARCH_alpha is not set
+CT_ARCH_arm=y
+# CT_ARCH_avr is not set
+# CT_ARCH_m68k is not set
+# CT_ARCH_mips is not set
+# CT_ARCH_nios2 is not set
+# CT_ARCH_powerpc is not set
+# CT_ARCH_s390 is not set
+# CT_ARCH_sh is not set
+# CT_ARCH_sparc is not set
+# CT_ARCH_x86 is not set
+# CT_ARCH_xtensa is not set
+CT_ARCH_alpha_AVAILABLE=y
+CT_ARCH_arm_AVAILABLE=y
+CT_ARCH_avr_AVAILABLE=y
+CT_ARCH_m68k_AVAILABLE=y
+CT_ARCH_microblaze_AVAILABLE=y
+CT_ARCH_mips_AVAILABLE=y
+CT_ARCH_nios2_AVAILABLE=y
+CT_ARCH_powerpc_AVAILABLE=y
+CT_ARCH_s390_AVAILABLE=y
+CT_ARCH_sh_AVAILABLE=y
+CT_ARCH_sparc_AVAILABLE=y
+CT_ARCH_x86_AVAILABLE=y
+CT_ARCH_xtensa_AVAILABLE=y
+CT_ARCH_SUFFIX="v7"
+
+#
+# Generic target options
+#
+# CT_MULTILIB is not set
+CT_ARCH_USE_MMU=y
+CT_ARCH_ENDIAN="little"
+
+#
+# Target optimisations
+#
+CT_ARCH_EXCLUSIVE_WITH_CPU=y
+# CT_ARCH_FLOAT_AUTO is not set
+# CT_ARCH_FLOAT_SOFTFP is not set
+CT_ARCH_FLOAT="hard"
+
+#
+# arm other options
+#
+CT_ARCH_ARM_MODE="thumb"
+# CT_ARCH_ARM_MODE_ARM is not set
+CT_ARCH_ARM_MODE_THUMB=y
+# CT_ARCH_ARM_INTERWORKING is not set
+CT_ARCH_ARM_EABI_FORCE=y
+CT_ARCH_ARM_EABI=y
+CT_ARCH_ARM_TUPLE_USE_EABIHF=y
+
+#
+# Toolchain options
+#
+
+#
+# General toolchain options
+#
+CT_FORCE_SYSROOT=y
+CT_USE_SYSROOT=y
+CT_SYSROOT_NAME="sysroot"
+CT_SYSROOT_DIR_PREFIX=""
+CT_WANTS_STATIC_LINK=y
+# CT_STATIC_TOOLCHAIN is not set
+CT_TOOLCHAIN_PKGVERSION=""
+CT_TOOLCHAIN_BUGURL=""
+
+#
+# Tuple completion and aliasing
+#
+CT_TARGET_VENDOR="unknown"
+CT_TARGET_ALIAS_SED_EXPR=""
+CT_TARGET_ALIAS=""
+
+#
+# Toolchain type
+#
+CT_CROSS=y
+# CT_CANADIAN is not set
+CT_TOOLCHAIN_TYPE="cross"
+
+#
+# Build system
+#
+CT_BUILD=""
+CT_BUILD_PREFIX=""
+CT_BUILD_SUFFIX=""
+
+#
+# Misc options
+#
+# CT_TOOLCHAIN_ENABLE_NLS is not set
+
+#
+# Operating System
+#
+CT_KERNEL_SUPPORTS_SHARED_LIBS=y
+CT_KERNEL="linux"
+CT_KERNEL_VERSION="3.2.72"
+# CT_KERNEL_bare_metal is not set
+CT_KERNEL_linux=y
+CT_KERNEL_bare_metal_AVAILABLE=y
+CT_KERNEL_linux_AVAILABLE=y
+# CT_KERNEL_V_4_3 is not set
+# CT_KERNEL_V_4_2 is not set
+# CT_KERNEL_V_4_1 is not set
+# CT_KERNEL_V_3_18 is not set
+# CT_KERNEL_V_3_14 is not set
+# CT_KERNEL_V_3_12 is not set
+# CT_KERNEL_V_3_10 is not set
+# CT_KERNEL_V_3_4 is not set
+CT_KERNEL_V_3_2=y
+# CT_KERNEL_V_2_6_32 is not set
+# CT_KERNEL_LINUX_CUSTOM is not set
+CT_KERNEL_windows_AVAILABLE=y
+
+#
+# Common kernel options
+#
+CT_SHARED_LIBS=y
+
+#
+# linux other options
+#
+CT_KERNEL_LINUX_VERBOSITY_0=y
+# CT_KERNEL_LINUX_VERBOSITY_1 is not set
+# CT_KERNEL_LINUX_VERBOSITY_2 is not set
+CT_KERNEL_LINUX_VERBOSE_LEVEL=0
+CT_KERNEL_LINUX_INSTALL_CHECK=y
+
+#
+# Binary utilities
+#
+CT_ARCH_BINFMT_ELF=y
+CT_BINUTILS="binutils"
+CT_BINUTILS_binutils=y
+
+#
+# GNU binutils
+#
+# CT_CC_BINUTILS_SHOW_LINARO is not set
+CT_BINUTILS_V_2_25_1=y
+# CT_BINUTILS_V_2_25 is not set
+# CT_BINUTILS_V_2_24 is not set
+# CT_BINUTILS_V_2_23_2 is not set
+# CT_BINUTILS_V_2_23_1 is not set
+# CT_BINUTILS_V_2_22 is not set
+# CT_BINUTILS_V_2_21_53 is not set
+# CT_BINUTILS_V_2_21_1a is not set
+# CT_BINUTILS_V_2_20_1a is not set
+# CT_BINUTILS_V_2_19_1a is not set
+# CT_BINUTILS_V_2_18a is not set
+CT_BINUTILS_VERSION="2.25.1"
+CT_BINUTILS_2_25_1_or_later=y
+CT_BINUTILS_2_25_or_later=y
+CT_BINUTILS_2_24_or_later=y
+CT_BINUTILS_2_23_or_later=y
+CT_BINUTILS_2_22_or_later=y
+CT_BINUTILS_2_21_or_later=y
+CT_BINUTILS_2_20_or_later=y
+CT_BINUTILS_2_19_or_later=y
+CT_BINUTILS_2_18_or_later=y
+CT_BINUTILS_HAS_HASH_STYLE=y
+CT_BINUTILS_HAS_GOLD=y
+CT_BINUTILS_GOLD_SUPPORTS_ARCH=y
+CT_BINUTILS_GOLD_SUPPORT=y
+CT_BINUTILS_HAS_PLUGINS=y
+CT_BINUTILS_HAS_PKGVERSION_BUGURL=y
+CT_BINUTILS_LINKER_LD=y
+# CT_BINUTILS_LINKER_GOLD is not set
+# CT_BINUTILS_LINKER_LD_GOLD is not set
+# CT_BINUTILS_LINKER_GOLD_LD is not set
+CT_BINUTILS_LINKERS_LIST="ld"
+CT_BINUTILS_LINKER_DEFAULT="bfd"
+# CT_BINUTILS_PLUGINS is not set
+CT_BINUTILS_EXTRA_CONFIG_ARRAY=""
+# CT_BINUTILS_FOR_TARGET is not set
+
+#
+# binutils other options
+#
+
+#
+# C-library
+#
+CT_LIBC="musl"
+CT_LIBC_VERSION="1.0.5"
+# CT_LIBC_glibc is not set
+CT_LIBC_musl=y
+# CT_LIBC_newlib is not set
+# CT_LIBC_none is not set
+# CT_LIBC_uClibc is not set
+CT_LIBC_avr_libc_AVAILABLE=y
+CT_LIBC_glibc_AVAILABLE=y
+CT_THREADS="musl"
+# CT_LIBC_GLIBC_V_2_22 is not set
+# CT_LIBC_GLIBC_V_2_21 is not set
+# CT_LIBC_GLIBC_V_2_20 is not set
+# CT_LIBC_GLIBC_V_2_19 is not set
+# CT_LIBC_GLIBC_V_2_18 is not set
+# CT_LIBC_GLIBC_V_2_17 is not set
+# CT_LIBC_GLIBC_V_2_16_0 is not set
+# CT_LIBC_GLIBC_V_2_15 is not set
+# CT_LIBC_GLIBC_V_2_14_1 is not set
+# CT_LIBC_GLIBC_V_2_14 is not set
+# CT_LIBC_GLIBC_V_2_13 is not set
+# CT_LIBC_GLIBC_V_2_12_2 is not set
+# CT_LIBC_GLIBC_V_2_12_1 is not set
+# CT_LIBC_GLIBC_V_2_11_1 is not set
+# CT_LIBC_GLIBC_V_2_11 is not set
+# CT_LIBC_GLIBC_V_2_10_1 is not set
+# CT_LIBC_GLIBC_V_2_9 is not set
+# CT_LIBC_GLIBC_V_2_8 is not set
+CT_LIBC_mingw_AVAILABLE=y
+CT_LIBC_musl_AVAILABLE=y
+CT_LIBC_MUSL_V_1_0=y
+CT_LIBC_newlib_AVAILABLE=y
+CT_LIBC_none_AVAILABLE=y
+CT_LIBC_uClibc_AVAILABLE=y
+CT_LIBC_SUPPORT_THREADS_ANY=y
+CT_LIBC_SUPPORT_THREADS_NATIVE=y
+
+#
+# Common C library options
+#
+CT_THREADS_NATIVE=y
+CT_LIBC_XLDD=y
+# CT_LIBC_GLIBC_KERNEL_VERSION_NONE is not set
+# CT_LIBC_GLIBC_KERNEL_VERSION_AS_HEADERS is not set
+# CT_LIBC_GLIBC_KERNEL_VERSION_CHOSEN is not set
+
+#
+# musl other options
+#
+# CT_LIBC_MUSL_DEBUG is not set
+# CT_LIBC_MUSL_WARNINGS is not set
+# CT_LIBC_MUSL_OPTIMIZE_NONE is not set
+CT_LIBC_MUSL_OPTIMIZE_AUTO=y
+# CT_LIBC_MUSL_OPTIMIZE_SPEED is not set
+# CT_LIBC_MUSL_OPTIMIZE_SIZE is not set
+CT_LIBC_MUSL_OPTIMIZE="auto"
+
+#
+# C compiler
+#
+CT_CC="gcc"
+CT_CC_CORE_PASSES_NEEDED=y
+CT_CC_CORE_PASS_1_NEEDED=y
+CT_CC_CORE_PASS_2_NEEDED=y
+CT_CC_gcc=y
+# CT_CC_GCC_SHOW_LINARO is not set
+CT_CC_GCC_V_5_2_0=y
+# CT_CC_GCC_V_4_9_3 is not set
+# CT_CC_GCC_V_4_8_5 is not set
+# CT_CC_GCC_V_4_7_4 is not set
+# CT_CC_GCC_V_4_6_4 is not set
+# CT_CC_GCC_V_4_5_4 is not set
+# CT_CC_GCC_V_4_4_7 is not set
+# CT_CC_GCC_V_4_3_6 is not set
+# CT_CC_GCC_V_4_2_4 is not set
+CT_CC_GCC_4_2_or_later=y
+CT_CC_GCC_4_3_or_later=y
+CT_CC_GCC_4_4_or_later=y
+CT_CC_GCC_4_5_or_later=y
+CT_CC_GCC_4_6_or_later=y
+CT_CC_GCC_4_7_or_later=y
+CT_CC_GCC_4_8_or_later=y
+CT_CC_GCC_4_9_or_later=y
+CT_CC_GCC_5=y
+CT_CC_GCC_5_or_later=y
+CT_CC_GCC_HAS_GRAPHITE=y
+CT_CC_GCC_USE_GRAPHITE=y
+CT_CC_GCC_HAS_LTO=y
+CT_CC_GCC_USE_LTO=y
+CT_CC_GCC_HAS_PKGVERSION_BUGURL=y
+CT_CC_GCC_HAS_BUILD_ID=y
+CT_CC_GCC_HAS_LNK_HASH_STYLE=y
+CT_CC_GCC_USE_GMP_MPFR=y
+CT_CC_GCC_USE_MPC=y
+CT_CC_GCC_HAS_LIBQUADMATH=y
+CT_CC_GCC_HAS_LIBSANITIZER=y
+CT_CC_GCC_VERSION="5.2.0"
+# CT_CC_LANG_FORTRAN is not set
+CT_CC_GCC_ENABLE_CXX_FLAGS=""
+CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_EXTRA_CONFIG_ARRAY=""
+CT_CC_GCC_EXTRA_ENV_ARRAY=""
+CT_CC_GCC_STATIC_LIBSTDCXX=y
+# CT_CC_GCC_SYSTEM_ZLIB is not set
+
+#
+# Optimisation features
+#
+
+#
+# Settings for libraries running on target
+#
+CT_CC_GCC_ENABLE_TARGET_OPTSPACE=y
+# CT_CC_GCC_LIBMUDFLAP is not set
+# CT_CC_GCC_LIBGOMP is not set
+# CT_CC_GCC_LIBSSP is not set
+# CT_CC_GCC_LIBQUADMATH is not set
+
+#
+# Misc. obscure options.
+#
+CT_CC_CXA_ATEXIT=y
+# CT_CC_GCC_DISABLE_PCH is not set
+CT_CC_GCC_SJLJ_EXCEPTIONS=m
+CT_CC_GCC_LDBL_128=m
+# CT_CC_GCC_BUILD_ID is not set
+CT_CC_GCC_LNK_HASH_STYLE_DEFAULT=y
+# CT_CC_GCC_LNK_HASH_STYLE_SYSV is not set
+# CT_CC_GCC_LNK_HASH_STYLE_GNU is not set
+# CT_CC_GCC_LNK_HASH_STYLE_BOTH is not set
+CT_CC_GCC_LNK_HASH_STYLE=""
+CT_CC_GCC_DEC_FLOAT_AUTO=y
+# CT_CC_GCC_DEC_FLOAT_BID is not set
+# CT_CC_GCC_DEC_FLOAT_DPD is not set
+# CT_CC_GCC_DEC_FLOATS_NO is not set
+CT_CC_SUPPORT_CXX=y
+CT_CC_SUPPORT_FORTRAN=y
+CT_CC_SUPPORT_JAVA=y
+CT_CC_SUPPORT_ADA=y
+CT_CC_SUPPORT_OBJC=y
+CT_CC_SUPPORT_OBJCXX=y
+CT_CC_SUPPORT_GOLANG=y
+
+#
+# Additional supported languages:
+#
+CT_CC_LANG_CXX=y
+# CT_CC_LANG_JAVA is not set
+
+#
+# Debug facilities
+#
+# CT_DEBUG_dmalloc is not set
+# CT_DEBUG_duma is not set
+# CT_DEBUG_gdb is not set
+# CT_DEBUG_ltrace is not set
+# CT_DEBUG_strace is not set
+
+#
+# Companion libraries
+#
+CT_COMPLIBS_NEEDED=y
+CT_GMP_NEEDED=y
+CT_MPFR_NEEDED=y
+CT_ISL_NEEDED=y
+CT_MPC_NEEDED=y
+CT_COMPLIBS=y
+CT_GMP=y
+CT_MPFR=y
+CT_ISL=y
+CT_MPC=y
+# CT_LIBICONV_V_1_14 is not set
+CT_GMP_V_6_0_0=y
+# CT_GMP_V_5_1_3 is not set
+# CT_GMP_V_5_1_1 is not set
+# CT_GMP_V_5_0_2 is not set
+# CT_GMP_V_5_0_1 is not set
+# CT_GMP_V_4_3_2 is not set
+# CT_GMP_V_4_3_1 is not set
+# CT_GMP_V_4_3_0 is not set
+CT_GMP_5_0_2_or_later=y
+CT_GMP_VERSION="6.0.0a"
+CT_MPFR_V_3_1_3=y
+# CT_MPFR_V_3_1_2 is not set
+# CT_MPFR_V_3_1_0 is not set
+# CT_MPFR_V_3_0_1 is not set
+# CT_MPFR_V_3_0_0 is not set
+# CT_MPFR_V_2_4_2 is not set
+# CT_MPFR_V_2_4_1 is not set
+# CT_MPFR_V_2_4_0 is not set
+CT_MPFR_VERSION="3.1.3"
+CT_ISL_V_0_14=y
+# CT_ISL_V_0_12_2 is not set
+CT_ISL_V_0_14_or_later=y
+CT_ISL_V_0_12_or_later=y
+CT_ISL_VERSION="0.14"
+CT_MPC_V_1_0_3=y
+# CT_MPC_V_1_0_2 is not set
+# CT_MPC_V_1_0_1 is not set
+# CT_MPC_V_1_0 is not set
+# CT_MPC_V_0_9 is not set
+# CT_MPC_V_0_8_2 is not set
+# CT_MPC_V_0_8_1 is not set
+# CT_MPC_V_0_7 is not set
+CT_MPC_VERSION="1.0.3"
+
+#
+# Companion libraries common options
+#
+# CT_COMPLIBS_CHECK is not set
+
+#
+# Companion tools
+#
+
+#
+# READ HELP before you say 'Y' below !!!
+#
+# CT_COMP_TOOLS is not set
diff --git a/slaves/linux-cross/build-libunwind.sh b/slaves/linux-cross/build-libunwind.sh
new file mode 100644
index 0000000..726aeab
--- /dev/null
+++ b/slaves/linux-cross/build-libunwind.sh
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -ex
+
+# To build MUSL targets we're going to need a libunwind lying around, so acquire that
+# here and build it.
+if [ ! -d "llvm-3.8.0.src"  ]; then
+    curl http://llvm.org/releases/3.8.0/llvm-3.8.0.src.tar.xz | tar xJf -
+fi
+
+if [ ! -d "libunwind-3.8.0.src" ]; then
+    curl http://llvm.org/releases/3.8.0/libunwind-3.8.0.src.tar.xz | tar xJf -
+fi
+
+rm -rf libunwind-build
+mkdir libunwind-build
+cd libunwind-build
+CC=${1/unknown-/}-gcc CXX=${1/unknown-/}-gcc cmake \
+  ../libunwind-3.8.0.src \
+  -DLLVM_PATH=../llvm-3.8.0.src \
+  -DLIBUNWIND_ENABLE_SHARED=0
+VERBOSE=1 make -j1
+cp lib/libunwind.a /x-tools/${1}/${1}/sysroot/usr/lib/