patch 8.2.5061: C89 requires signal handlers to return void Commit: https://github.com/vim/vim/commit/99c48fe9974b8d70ca33674658a3da722b0d6466 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jun 5 22:05:19 2022 +0100 patch 8.2.5061: C89 requires signal handlers to return void Problem: C89 requires signal handlers to return void. Solution: Drop RETSIGTYPE and hard-code a void return value.

# Clang 12 (or Apple clang 13) and later makes a warning '-Wcompound-token-split-by-macro' enable by default.
/^PERL_CFLAGS_EXTRA[[:blank:]]*=/s/$/ -Wno-error=compound-token-split-by-macro/
/^RUBY_CFLAGS_EXTRA[[:blank:]]*=/s/$/ -Wno-error=compound-token-split-by-macro/