[MacOS] Figure out why PKG_CONFIG_PATH is not set correctly, and what the canonical way to fix this is (if any)

[vedang]

See my comment on the linked issue #269 , and the related commit which closes this issue for details about the problem.

[Ethanlinyf]

See the error info. below for your reference:

./configure -q --bindir=/Users/ethanlin/.emacs.d/elpa/pdf-tools-20240429.407/ && make clean && make -s
configure: error: Package requirements (glib-2.0) were not met:

Package 'libpcre2-8', required by 'glib-2.0', not found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables glib_CFLAGS
and glib_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

• Build failed. ;o(
  ===========================

Note: maybe try the '-d' option.

Comint exited abnormally with code 1 at Sun Aug 11 18:04:42