>>> libcap-ng 0.7.9 Extracting
gzip -d -c /home/buildroot/build/instance-2/dl/libcap-ng/libcap-ng-0.7.9.tar.gz | tar --strip-components=1 -C /home/buildroot/build/instance-2/output-1/build/libcap-ng-0.7.9   -xf -
>>> libcap-ng 0.7.9 Patching

Applying 0001-Fix-compilation-without-pthread.h.patch using patch: 
patching file configure.ac
patching file src/cap-ng.c
>>> libcap-ng 0.7.9 Updating config.sub and config.guess
for file in config.guess config.sub; do for i in $(find /home/buildroot/build/instance-2/output-1/build/libcap-ng-0.7.9 -name $file); do cp support/gnuconfig/$file $i; done; done
>>> libcap-ng 0.7.9 Configuring
>>> libcap-ng 0.7.9 Autoreconfiguring
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'm4'.
libtoolize: copying file 'm4/libtool.m4'
libtoolize: copying file 'm4/ltoptions.m4'
libtoolize: copying file 'm4/ltsugar.m4'
libtoolize: copying file 'm4/ltversion.m4'
libtoolize: copying file 'm4/lt~obsolete.m4'
configure.ac:41: installing './compile'
configure.ac:40: installing './missing'
bindings/python/Makefile.am: installing './depcomp'
bindings/src/Makefile.am:24: warning: variable 'SWIG_SOURCES' is defined but no program or
bindings/src/Makefile.am:24: library has 'SWIG' as canonical name (possible typo)
>>> libcap-ng 0.7.9 Patching libtool
patching file /home/buildroot/build/instance-2/output-1/build/libcap-ng-0.7.9/ltmain.sh
Hunk #1 succeeded at 2694 (offset 7 lines).
Hunk #2 succeeded at 4284 (offset 7 lines).
Hunk #3 succeeded at 6579 (offset 25 lines).
Hunk #4 succeeded at 6589 (offset 25 lines).
Hunk #5 succeeded at 6882 (offset 25 lines).
Hunk #6 succeeded at 7174 (offset 25 lines).
Hunk #7 succeeded at 8140 (offset 28 lines).
Hunk #8 succeeded at 10769 (offset 59 lines).
(cd /home/buildroot/build/instance-2/output-1/build/libcap-ng-0.7.9/ && rm -rf config.cache && PATH="/home/buildroot/build/instance-2/output-1/host/bin:/home/buildroot/build/instance-2/output-1/host/sbin:/sbin:/usr/sbin:/bin:/usr/bin" AR="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-ar" AS="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-as" LD="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-ld" NM="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-nm" CC="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-gcc" GCC="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-gcc" CPP="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-cpp" CXX="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-g++" FC="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-gfortran" F77="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-gfortran" RANLIB="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-ranlib" READELF="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-readelf" STRIP="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-strip" OBJCOPY="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-objcopy" OBJDUMP="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-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/buildroot/build/instance-2/output-1/host/include" CFLAGS_FOR_BUILD="-O2 -I/home/buildroot/build/instance-2/output-1/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/home/buildroot/build/instance-2/output-1/host/include" LDFLAGS_FOR_BUILD="-L/home/buildroot/build/instance-2/output-1/host/lib -Wl,-rpath,/home/buildroot/build/instance-2/output-1/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-as" DEFAULT_LINKER="/home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-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  -Os  " CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  " LDFLAGS="" FCFLAGS=" -Os " FFLAGS=" -Os " PKG_CONFIG="/home/buildroot/build/instance-2/output-1/host/bin/pkg-config" STAGING_DIR="/home/buildroot/build/instance-2/output-1/host/riscv32-buildroot-linux-gnu/sysroot" INTLTOOL_PERL=/usr/bin/perl 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  ac_cv_prog_swig_found=no CONFIG_SITE=/dev/null ./configure --target=riscv32-buildroot-linux-gnu --host=riscv32-buildroot-linux-gnu --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 --disable-static --enable-shared  --without-python )
configure: WARNING: unrecognized options: --disable-gtk-doc, --disable-gtk-doc-html, --disable-doc, --disable-docs, --disable-documentation, --with-xmlto, --with-fop, --enable-ipv6, --disable-nls
Configuring libcap-ng
checking build system type... x86_64-pc-linux-gnu
checking host system type... riscv32-buildroot-linux-gnu
checking target system type... riscv32-buildroot-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for riscv32-buildroot-linux-gnu-strip... /home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-strip
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking how to print strings... printf
checking for style of include used by make... GNU
checking for riscv32-buildroot-linux-gnu-gcc... /home/buildroot/build/instance-2/output-1/host/bin/riscv32-linux-gcc
checking whether the C compiler works... no
configure: error: in `/home/buildroot/build/instance-2/output-1/build/libcap-ng-0.7.9':
configure: error: C compiler cannot create executables
See `config.log' for more details
package/pkg-generic.mk:228: recipe for target '/home/buildroot/build/instance-2/output-1/build/libcap-ng-0.7.9/.stamp_configured' failed
make: *** [/home/buildroot/build/instance-2/output-1/build/libcap-ng-0.7.9/.stamp_configured] Error 77
make: Leaving directory '/home/buildroot/build/instance-2/buildroot'