>>> 4th 3.62.5 Extracting
gzip -d -c /home/mark/buildroot-test/instance-0/dl/4th/4th-3.62.5-unix.tar.gz | /home/mark/buildroot-test/instance-0/output/host/bin/tar --strip-components=1 -C /home/mark/buildroot-test/instance-0/output/build/4th-3.62.5   -xf -
>>> 4th 3.62.5 Patching

Applying 0001-avoid-regen-during-install.patch using patch: 
patching file sources/Makefile
>>> 4th 3.62.5 Configuring
>>> 4th 3.62.5 Building
PATH="/home/mark/buildroot-test/instance-0/output/host/bin:/home/mark/buildroot-test/instance-0/output/host/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin" SHARED=1 /usr/bin/make -j2 -C /home/mark/buildroot-test/instance-0/output/build/4th-3.62.5/sources all CROSS="/home/mark/buildroot-test/instance-0/output/host/bin/riscv32-linux-" CFLAGS="-D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os   -DUNIX -fsigned-char -fPIC" FOURTH=/home/mark/buildroot-test/instance-0/output/host/bin/4th
make[1]: Entering directory '/home/mark/buildroot-test/instance-0/output/build/4th-3.62.5/sources'
cp stage.h editor.h
/home/mark/buildroot-test/instance-0/output/host/bin/riscv32-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os   -DUNIX -fsigned-char -fPIC   -c -o errs_4th.o errs_4th.c
cp 4th.c stage.c
/home/mark/buildroot-test/instance-0/output/host/bin/riscv32-linux-gcc -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -Os   -DUNIX -fsigned-char -fPIC   -c -o save_4th.o save_4th.c
In file included from /home/mark/buildroot-test/instance-0/output/host/riscv32-buildroot-linux-gnu/sysroot/usr/include/features.h:474:0,
                 from /home/mark/buildroot-test/instance-0/output/host/riscv32-buildroot-linux-gnu/sysroot/usr/include/bits/libc-header-start.h:33,
                 from /home/mark/buildroot-test/instance-0/output/host/riscv32-buildroot-linux-gnu/sysroot/usr/include/stdio.h:27,
                 from 4th.h:28,
                 from save_4th.c:123:
/home/mark/buildroot-test/instance-0/output/host/riscv32-buildroot-linux-gnu/sysroot/usr/include/gnu/stubs.h:11:11: fatal error: gnu/stubs-ilp32d.h: No such file or directory
 # include <gnu/stubs-ilp32d.h>
           ^~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[1]: *** [<builtin>: save_4th.o] Error 1
make[1]: *** Waiting for unfinished jobs....
rm stage.c
make[1]: Leaving directory '/home/mark/buildroot-test/instance-0/output/build/4th-3.62.5/sources'
make: *** [package/pkg-generic.mk:241: /home/mark/buildroot-test/instance-0/output/build/4th-3.62.5/.stamp_built] Error 2
make: Leaving directory '/home/mark/buildroot-test/instance-0/buildroot'