>>> rhash 1.4.0 Extracting
gzip -d -c /home/giuliobenetti/autobuild/run/instance-0/dl/rhash/rhash-1.4.0-src.tar.gz | tar --strip-components=1 -C /home/giuliobenetti/autobuild/run/instance-0/output-1/build/rhash-1.4.0   -xf -
>>> rhash 1.4.0 Patching

Applying 0001-configure-allow-cross-compilation.patch using patch: 
patching file configure
>>> rhash 1.4.0 Configuring
(cd /home/giuliobenetti/autobuild/run/instance-0/output-1/build/rhash-1.4.0; PATH="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin:/home/giuliobenetti/autobuild/run/instance-0/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" AR="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-ar" AS="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-as" LD="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-ld" NM="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-nm" CC="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-gcc" GCC="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-gcc" CPP="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-cpp" CXX="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-g++" FC="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-gfortran" F77="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-gfortran" RANLIB="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-ranlib" READELF="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-readelf" STRIP="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-strip" OBJCOPY="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-objcopy" OBJDUMP="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-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/giuliobenetti/autobuild/run/instance-0/output-1/host/include" CFLAGS_FOR_BUILD="-O2 -I/home/giuliobenetti/autobuild/run/instance-0/output-1/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/home/giuliobenetti/autobuild/run/instance-0/output-1/host/include" LDFLAGS_FOR_BUILD="-L/home/giuliobenetti/autobuild/run/instance-0/output-1/host/lib -Wl,-rpath,/home/giuliobenetti/autobuild/run/instance-0/output-1/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-as" DEFAULT_LINKER="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-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    -Wl,-elf2flt -static" CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os    -Wl,-elf2flt -static  -Wl,-elf2flt -static" LDFLAGS=" -Wl,-elf2flt -static" FCFLAGS=" -Os   -Wl,-elf2flt -static" FFLAGS=" -Os   -Wl,-elf2flt -static" PKG_CONFIG="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/pkg-config" STAGING_DIR="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot" INTLTOOL_PERL=/usr/bin/perl ./configure --prefix=/usr --cc=/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/arm-linux-gcc --target=arm-buildroot-uclinux-uclibcgnueabi --enable-gettext --disable-openssl )
Checking for target OS ... UNKNOWN 

Error: Unknown target OS, please specify the --target option

Check "config.log" if you do not understand why it failed.
make: *** [package/pkg-generic.mk:240: /home/giuliobenetti/autobuild/run/instance-0/output-1/build/rhash-1.4.0/.stamp_configured] Error 1
make: Leaving directory '/home/giuliobenetti/autobuild/run/instance-0/buildroot'