>>> mpir 3.0.0 Extracting
bzcat /home/autobuild/autobuild/instance-9/dl/mpir/mpir-3.0.0.tar.bz2 | tar --strip-components=1 -C /home/autobuild/autobuild/instance-9/output-1/build/mpir-3.0.0   -xf -
>>> mpir 3.0.0 Patching

Applying 0001-mpn-arm-udiv.asm-workaround-binutils-bug-14887.patch using patch: 
patching file mpn/arm/udiv.asm
>>> mpir 3.0.0 Updating config.sub and config.guess
for file in config.guess config.sub; do for i in $(find /home/autobuild/autobuild/instance-9/output-1/build/mpir-3.0.0 -name $file); do cp support/gnuconfig/$file $i; done; done
>>> mpir 3.0.0 Patching libtool
patching file /home/autobuild/autobuild/instance-9/output-1/build/mpir-3.0.0/ltmain.sh
Hunk #7 succeeded at 6699 (offset 3 lines).
Hunk #8 succeeded at 9280 (offset 6 lines).
>>> mpir 3.0.0 Configuring
(cd /home/autobuild/autobuild/instance-9/output-1/build/mpir-3.0.0/ && rm -rf config.cache && GIT_DIR=. PATH="/home/autobuild/autobuild/instance-9/output-1/host/bin:/home/autobuild/autobuild/instance-9/output-1/host/sbin:/home/autobuild/make:/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/lib/jvm/default/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl" AR="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc-ar" AS="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-as" LD="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-ld" NM="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc-nm" CC="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc" GCC="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc" CPP="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-cpp" CXX="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-g++" FC="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gfortran" F77="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gfortran" RANLIB="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc-ranlib" READELF="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-readelf" STRIP="/bin/true" OBJCOPY="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-objcopy" OBJDUMP="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-objdump" AR_FOR_BUILD="/usr/bin/ar" AS_FOR_BUILD="/usr/bin/as" CC_FOR_BUILD="/usr/bin/gcc" GCC_FOR_BUILD="/usr/bin/gcc" CXX_FOR_BUILD="/usr/bin/g++" LD_FOR_BUILD="/usr/bin/ld" CPPFLAGS_FOR_BUILD="-I/home/autobuild/autobuild/instance-9/output-1/host/include" CFLAGS_FOR_BUILD="-O2 -I/home/autobuild/autobuild/instance-9/output-1/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/home/autobuild/autobuild/instance-9/output-1/host/include" LDFLAGS_FOR_BUILD="-L/home/autobuild/autobuild/instance-9/output-1/host/lib -Wl,-rpath,/home/autobuild/autobuild/instance-9/output-1/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-as" DEFAULT_LINKER="/home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-ld" CPPFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64" CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Og -g0  -fPIC  -Wl,-elf2flt=-r -static" CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Og -g0  -fPIC  -Wl,-elf2flt=-r -static  -Wl,-elf2flt=-r -static" LDFLAGS="  -Wl,-elf2flt=-r -static" FCFLAGS=" -Og -g0  -Wl,-elf2flt=-r -static" FFLAGS=" -Og -g0  -Wl,-elf2flt=-r -static" PKG_CONFIG="/home/autobuild/autobuild/instance-9/output-1/host/bin/pkg-config" STAGING_DIR="/home/autobuild/autobuild/instance-9/output-1/host/riscv64-buildroot-linux-uclibc/sysroot" INTLTOOL_PERL=/usr/bin/perl CXX=no ac_cv_lbl_unaligned_fail=yes ac_cv_func_mmap_fixed_mapped=yes ac_cv_func_memcmp_working=yes ac_cv_have_decl_malloc=yes gl_cv_func_malloc_0_nonnull=yes ac_cv_func_malloc_0_nonnull=yes ac_cv_func_calloc_0_nonnull=yes ac_cv_func_realloc_0_nonnull=yes lt_cv_sys_lib_search_path_spec="" ac_cv_c_bigendian=no   CONFIG_SITE=/dev/null ./configure --target=riscv64-buildroot-linux-uclibc --host=riscv64-buildroot-linux-uclibc --build=x86_64-pc-linux-gnu --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --localstatedir=/var --program-prefix="" --disable-gtk-doc --disable-gtk-doc-html --disable-doc --disable-docs --disable-documentation --with-xmlto=no --with-fop=no --disable-dependency-tracking --enable-ipv6 --disable-nls --enable-static --disable-shared   )
configure: WARNING: unrecognized options: --disable-gtk-doc, --disable-gtk-doc-html, --disable-doc, --disable-docs, --disable-documentation, --with-xmlto, --with-fop, --disable-dependency-tracking, --enable-ipv6, --disable-nls
checking build system type... x86_64-pc-linux-gnu
checking host system type... riscv64-buildroot-linux-uclibc
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for riscv64-buildroot-linux-uclibc-strip... /bin/true
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether to enable maintainer-specific portions of Makefiles... no
checking ABI=standard
checking whether /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc is gcc... yes
checking compiler /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Og -g0  -fPIC  -Wl,-elf2flt=-r -static -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64... yes
checking for riscv64-buildroot-linux-uclibc-gcc... /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc accepts -g... yes
checking for /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc option to accept ISO C89... none needed
checking whether /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc understands -c and -o together... yes
checking how to run the C preprocessor... /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-cpp
checking for grep that handles long lines and -e... /usr/bin/grep
checking for egrep... /usr/bin/grep -E
checking for ANSI C header files... yes
checking for sys/types.h... yes
checking for sys/stat.h... yes
checking for stdlib.h... yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... yes
checking minix/config.h usability... no
checking minix/config.h presence... no
checking for minix/config.h... no
checking whether it is safe to define __EXTENSIONS__... yes
checking for riscv64-buildroot-linux-uclibc-gcc... (cached) /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc
checking whether we are using the GNU C compiler... (cached) yes
checking whether /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc accepts -g... (cached) yes
checking for /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc option to accept ISO C89... (cached) none needed
checking whether /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc understands -c and -o together... (cached) yes
checking for /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc option to accept ISO C99... unsupported
checking for /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc option to accept ISO C89... (cached) none needed
checking for /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-gcc option to accept ISO Standard C... (cached) none needed
checking how to run the C preprocessor... /home/autobuild/autobuild/instance-9/output-1/host/bin/riscv64-buildroot-linux-uclibc-cpp
checking build system compiler /usr/bin/gcc... no
configure: error: Specified CC_FOR_BUILD doesn't seem to work
make: *** [package/pkg-generic.mk:273: /home/autobuild/autobuild/instance-9/output-1/build/mpir-3.0.0/.stamp_configured] Error 1
make: Leaving directory '/home/autobuild/autobuild/instance-9/buildroot'