>>> rhash 1.4.0 Downloading
--2021-01-09 02:52:40--  https://sourceforge.net/projects/rhash/files/rhash/1.4.0/rhash-1.4.0-src.tar.gz
Resolving sourceforge.net (sourceforge.net)... 216.105.38.13
Connecting to sourceforge.net (sourceforge.net)|216.105.38.13|:443... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://sourceforge.net/projects/rhash/files/rhash/1.4.0/rhash-1.4.0-src.tar.gz/ [following]
--2021-01-09 02:52:41--  https://sourceforge.net/projects/rhash/files/rhash/1.4.0/rhash-1.4.0-src.tar.gz/
Reusing existing connection to sourceforge.net:443.
HTTP request sent, awaiting response... 302 Found
Location: https://sourceforge.net/projects/rhash/files/rhash/1.4.0/rhash-1.4.0-src.tar.gz/download [following]
--2021-01-09 02:52:41--  https://sourceforge.net/projects/rhash/files/rhash/1.4.0/rhash-1.4.0-src.tar.gz/download
Reusing existing connection to sourceforge.net:443.
HTTP request sent, awaiting response... 302 Found
Location: https://downloads.sourceforge.net/project/rhash/rhash/1.4.0/rhash-1.4.0-src.tar.gz?r=&ts=1610160761&use_mirror=iweb [following]
--2021-01-09 02:52:41--  https://downloads.sourceforge.net/project/rhash/rhash/1.4.0/rhash-1.4.0-src.tar.gz?r=&ts=1610160761&use_mirror=iweb
Resolving downloads.sourceforge.net (downloads.sourceforge.net)... 216.105.38.13
Connecting to downloads.sourceforge.net (downloads.sourceforge.net)|216.105.38.13|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://iweb.dl.sourceforge.net/project/rhash/rhash/1.4.0/rhash-1.4.0-src.tar.gz [following]
--2021-01-09 02:52:41--  https://iweb.dl.sourceforge.net/project/rhash/rhash/1.4.0/rhash-1.4.0-src.tar.gz
Resolving iweb.dl.sourceforge.net (iweb.dl.sourceforge.net)... 192.175.120.182, 2607:f748:10:12::5f:2
Connecting to iweb.dl.sourceforge.net (iweb.dl.sourceforge.net)|192.175.120.182|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 406433 (397K) [application/x-gzip]
Saving to: '/home/buildroot/autobuild/instance-2/output-1/build/.rhash-1.4.0-src.tar.gz.0XjeGu/output'

     0K .......... .......... .......... .......... .......... 12%  268K 1s
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   100K .......... .......... .......... .......... .......... 37%  101M 0s
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   350K .......... .......... .......... .......... ......    100%  125M=0.5s

2021-01-09 02:52:42 (849 KB/s) - '/home/buildroot/autobuild/instance-2/output-1/build/.rhash-1.4.0-src.tar.gz.0XjeGu/output' saved [406433/406433]

rhash-1.4.0-src.tar.gz: OK (sha1: 3db1e87a31c77ca2fa5507db7932ef92e9eb5148)
rhash-1.4.0-src.tar.gz: OK (sha256: 2ea39540f5c580da0e655f7b483c19e0d31506aed4202d88e8459fa7aeeb8861)
>>> rhash 1.4.0 Extracting
gzip -d -c /home/buildroot/autobuild/instance-2/dl/rhash/rhash-1.4.0-src.tar.gz | tar --strip-components=1 -C /home/buildroot/autobuild/instance-2/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/buildroot/autobuild/instance-2/output-1/build/rhash-1.4.0; PATH="/home/buildroot/autobuild/instance-2/output-1/host/bin:/home/buildroot/autobuild/instance-2/output-1/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" AR="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-ar" AS="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-as" LD="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-ld" NM="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-nm" CC="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-gcc" GCC="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-gcc" CPP="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-cpp" CXX="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-g++" FC="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-gfortran" F77="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-gfortran" RANLIB="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-ranlib" READELF="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-readelf" STRIP="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-strip" OBJCOPY="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-objcopy" OBJDUMP="/home/buildroot/autobuild/instance-2/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/buildroot/autobuild/instance-2/output-1/host/include" CFLAGS_FOR_BUILD="-O2 -I/home/buildroot/autobuild/instance-2/output-1/host/include" CXXFLAGS_FOR_BUILD="-O2 -I/home/buildroot/autobuild/instance-2/output-1/host/include" LDFLAGS_FOR_BUILD="-L/home/buildroot/autobuild/instance-2/output-1/host/lib -Wl,-rpath,/home/buildroot/autobuild/instance-2/output-1/host/lib" FCFLAGS_FOR_BUILD="" DEFAULT_ASSEMBLER="/home/buildroot/autobuild/instance-2/output-1/host/bin/arm-linux-as" DEFAULT_LINKER="/home/buildroot/autobuild/instance-2/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/buildroot/autobuild/instance-2/output-1/host/bin/pkg-config" STAGING_DIR="/home/buildroot/autobuild/instance-2/output-1/host/arm-buildroot-uclinux-uclibcgnueabi/sysroot" INTLTOOL_PERL=/usr/bin/perl ./configure --prefix=/usr --cc=/home/buildroot/autobuild/instance-2/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.
package/pkg-generic.mk:231: recipe for target '/home/buildroot/autobuild/instance-2/output-1/build/rhash-1.4.0/.stamp_configured' failed
make: *** [/home/buildroot/autobuild/instance-2/output-1/build/rhash-1.4.0/.stamp_configured] Error 1
make: Leaving directory '/home/buildroot/autobuild/instance-2/buildroot'