Error in make sdk

[djdiskmachine]

Attempted to build SDK for Bittboy dev
Followed instructions in Mdashdotdashn/LittleGPTracker#10 (comment)
Went to buildroot folder and make sdk

Expected behavior: build success
Actual behavior: build fails on

In file included from /usr/include/signal.h:328,
                 from ./signal.h:52,
                 from c-stack.c:49:
c-stack.c:55:26: error: missing binary operator before token "("
   55 | #elif HAVE_LIBSIGSEGV && SIGSTKSZ < 16384
      |                          ^~~~~~~~
make[5]: *** [Makefile:1915: c-stack.o] Error 1
make[5]: *** Waiting for unfinished jobs....
  CC       cloexec.o
make[4]: *** [Makefile:1674: all] Error 2
make[3]: *** [Makefile:1572: all-recursive] Error 1
make[2]: *** [Makefile:1528: all] Error 2
make[1]: *** [package/pkg-generic.mk:250: /home/m/Documents/GitRepos/buildroot/output/build/host-m4-1.4.18/.stamp_built] Error 2
make: *** [Makefile:84: _all] Error 2

[djdiskmachine]

Tried to solve with patch for M4_VERSION = 1.4.19:
openwrt/openwrt@aa2d61e
But the patch doesn't apply -__-

[djdiskmachine]

Solved by applying this patch:
https://gist.github.com/djdiskmachine/d40676262d1b4a12430ae117220d3d8d