>>> sslh 1.21c Downloading
--2021-01-25 22:04:36--  http://www.rutschle.net/tech/sslh/sslh-v1.21c.tar.gz
Resolving www.rutschle.net (www.rutschle.net)... 212.47.237.232
Connecting to www.rutschle.net (www.rutschle.net)|212.47.237.232|:80... connected.
HTTP request sent, awaiting response... 301 Moved Permanently
Location: https://www.rutschle.net/tech/sslh/sslh-v1.21c.tar.gz [following]
--2021-01-25 22:04:36--  https://www.rutschle.net/tech/sslh/sslh-v1.21c.tar.gz
Connecting to www.rutschle.net (www.rutschle.net)|212.47.237.232|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 111894 (109K) [application/x-gzip]
Saving to: '/home/giuliobenetti/autobuild/run/instance-0/output-1/build/.sslh-v1.21c.tar.gz.ewEIFf/output'

     0K .......... .......... .......... .......... .......... 45%  755K 0s
    50K .......... .......... .......... .......... .......... 91% 1.70M 0s
   100K .........                                             100% 51.6M=0.1s

2021-01-25 22:04:36 (1.12 MB/s) - '/home/giuliobenetti/autobuild/run/instance-0/output-1/build/.sslh-v1.21c.tar.gz.ewEIFf/output' saved [111894/111894]

sslh-v1.21c.tar.gz: OK (sha256: 3bfe783726f82c1f5a4be630ddc494ebb08dbb69980662cd7ffdeb7bc9e1e706)
>>> sslh 1.21c Extracting
gzip -d -c /home/giuliobenetti/autobuild/run/instance-0/dl/sslh/sslh-v1.21c.tar.gz | tar --strip-components=1 -C /home/giuliobenetti/autobuild/run/instance-0/output-1/build/sslh-1.21c   -xf -
>>> sslh 1.21c Patching

Applying 0001-Makefile-fix-static-linking-with-pcre.patch using patch: 
patching file Makefile
>>> sslh 1.21c Configuring
>>> sslh 1.21c Building
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" /usr/bin/make -j5 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/aarch64-linux-ar" AS="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-as" LD="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-ld" NM="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-nm" CC="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gcc" GCC="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gcc" CPP="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-cpp" CXX="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-g++" FC="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gfortran" F77="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gfortran" RANLIB="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-ranlib" READELF="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-readelf" STRIP="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-strip" OBJCOPY="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-objcopy" OBJDUMP="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-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/aarch64-linux-as" DEFAULT_LINKER="/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-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  -D_FORTIFY_SOURCE=1" CXXFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  -D_FORTIFY_SOURCE=1" LDFLAGS="" FCFLAGS=" -Os " FFLAGS=" -Os " 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/aarch64-buildroot-linux-gnu/sysroot" INTLTOOL_PERL=/usr/bin/perl USELIBBSD=1 USELIBCAP=1 USELIBCONFIG= USELIBPCRE=1 USESYSTEMD=1 -C /home/giuliobenetti/autobuild/run/instance-0/output-1/build/sslh-1.21c
make[1]: Entering directory '/home/giuliobenetti/autobuild/run/instance-0/output-1/build/sslh-1.21c'
./genver.sh >version.h
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  -D_FORTIFY_SOURCE=1 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -c sslh-fork.c
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  -D_FORTIFY_SOURCE=1 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -c sslh-select.c
pod2man --section=8 --release=1.21c --center=" " sslh.pod | gzip -9 - > sslh.8.gz	
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  -D_FORTIFY_SOURCE=1 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -c echosrv.c
/home/giuliobenetti/autobuild/run/instance-0/output-1/host/bin/aarch64-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os  -D_FORTIFY_SOURCE=1 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -c systemd-sslh-generator.c
systemd-sslh-generator.c:1:10: fatal error: libconfig.h: No such file or directory
 #include <libconfig.h>
          ^~~~~~~~~~~~~
compilation terminated.
make[1]: *** [Makefile:74: systemd-sslh-generator.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/home/giuliobenetti/autobuild/run/instance-0/output-1/build/sslh-1.21c'
make: *** [package/pkg-generic.mk:250: /home/giuliobenetti/autobuild/run/instance-0/output-1/build/sslh-1.21c/.stamp_built] Error 2
make: Leaving directory '/home/giuliobenetti/autobuild/run/instance-0/buildroot'