$ git clean -X -f
Removing config.mak
Removing suppl/src/addu.obj
Removing suppl/src/byte2par.obj
$ ./mak.sh
File config.mak missing, copying config.std to it
Building FreeCOM for language english
Make is make -f gnumake.mak.

Checking SUPPL library
Building SUPPL library
make: Nothing to be done for 'suppl.mak'.
rm -f gcc.cfg
echo >> gcc.cfg -Os -Wall -Werror -Wno-pointer-to-int-cast -Wno-incompatible-pointer-types -mregparmcall -fno-builtin -fno-strict-aliasing -Wno-format -mfar-function-if-far-return-type -fno-caller-saves -fno-optimize-sibling-calls -fno-move-loop-invariants -fno-tree-loop-optimize -fno-rerun-cse-after-loop
echo >> gcc.cfg -I. -I../compat -I../suppl/compat -I../suppl
echo >> gcc.cfg -mcmodel=small
echo >> gcc.cfg -UDEBUG -DNDEBUG -DXMS_SWAP
cp gcc.cfg src
make: Nothing to be done for 'suppl.mak'.
ia16-elf-gcc -c -I.. addu.c @gcc.cfg -o addu.obj
ia16-elf-gcc -c -I.. byte2par.c @gcc.cfg -o byte2par.obj
ia16-elf-gcc -c -I.. cntry.c @gcc.cfg -o cntry.obj
In file included from cntry.c:115:0:
../fmemory.h:57:11: error: conflicting types for ‘_fmemchr’
 char far *_fmemchr(const char far * const s, int ch, unsigned length);
           ^~~~~~~~
In file included from /home/[...]/proj/build-ia16/prefix/ia16-elf/include/libi86/internal/wrap/string.h:5:0,
                 from cntry.c:111:
/home/[...]/proj/build-ia16/prefix/ia16-elf/include/libi86/string.h:41:23: note: previous declaration of ‘_fmemchr’ was here
 extern __libi86_fpv_t _fmemchr (__libi86_fpcv_t __s, int __c,
                       ^~~~~~~~
In file included from cntry.c:115:0:
../fmemory.h:63:6: error: conflicting types for ‘_fstrcpy’
 void _fstrcpy(char far * const dst, const char far * const src);
      ^~~~~~~~
In file included from /home/[...]/proj/build-ia16/prefix/ia16-elf/include/libi86/internal/wrap/string.h:5:0,
                 from cntry.c:111:
/home/[...]/proj/build-ia16/prefix/ia16-elf/include/libi86/string.h:53:23: note: previous declaration of ‘_fstrcpy’ was here
 extern __libi86_fpc_t _fstrcpy (__libi86_fpc_t __dest, __libi86_fpcc_t __src);
                       ^~~~~~~~
make: *** [../../mkfiles/gcc.mak:30: cntry.obj] Error 1
$