Building from source on MacOS - env variables

[JCGoran]

I am trying to build pypy from source using a brew-installed pypy following the guide on an ARM-based MacOS.
At one step of the installation process (i.e. running pypy ../../rpython/bin/rpython --opt=jit), I see:

[platform:WARNING] ld: warning: ignoring file '/usr/local/Cellar/gettext/0.22.4/lib/libintl.8.dylib': found architecture 'x86_64', required architecture 'arm64'

which is reasonable since I have both brew for arm64 and brew for x86_64 installed, and I installed gettext on both archs.
I thought that this wouldn't be a big deal, but trying to run the pypy-c executable fails with missing gettext symbols:

$ ./pypy-c
dyld[85716]: symbol not found in flat namespace '_libintl_bind_textdomain_codeset'

My question is, how do I specify the LDFLAGS (or whatever env variables pypy installer is looking at) so it finds the right gettext library? I tried setting LDFLAGS="-L/opt/homebrew/Cellar/gettext/<version>/lib ${LDFLAGS}", but that didn't work.

For reference, on ARM-based MacOS, brew installs everything under /opt/homebrew instead of /usr/local.

[mattip]

You should activaye the arm64 brew for an arm64 build, use a arm64 pypy2.7 for translation, and make sure you have not activated the x86_64 brew in that shell.

[mattip]

And make sure pkg-config returns the correct gettext

[JCGoran]

I managed to get it to work by unlinking the x86_64 version of gettext by running brew unlink gettext in a Rosetta 2 (x86_64) terminal before compiling. Then the warning message does not appear, and the built pypy-c binary runs as expected.