Linking error on macOS

[keigoi]

Hello! When I try to compile a code that uses pyre-ast as a library, I get the following error, indicating a linking-time error:

File "bin/dune", line 3, characters 7-11:
3 |  (name main)
           ^^^^
Undefined symbols for architecture x86_64:
  "_libintl_bind_textdomain_codeset", referenced from:
      __locale_bind_textdomain_codeset in libpython.a(_localemodule.o)
  "_libintl_bindtextdomain", referenced from:
      __locale_bindtextdomain in libpython.a(_localemodule.o)
  "_libintl_dcgettext", referenced from:
      __locale_dcgettext in libpython.a(_localemodule.o)
  "_libintl_dgettext", referenced from:
      __locale_dgettext in libpython.a(_localemodule.o)
  "_libintl_gettext", referenced from:
      __locale_gettext in libpython.a(_localemodule.o)
  "_libintl_setlocale", referenced from:
      __locale_setlocale in libpython.a(_localemodule.o)
      __locale_localeconv in libpython.a(_localemodule.o)
  "_libintl_textdomain", referenced from:
      __locale_textdomain in libpython.a(_localemodule.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
File "caml_startup", line 1:
Error: Error during linking (exit code 1)

After some searching on the web, I found the following related issue:
beeware/Python-Apple-support#91

And they suggests temporarily hiding /usr/local/* from the system.

The following workaround works for me:

# rename /usr/local/* so that they won't affect the compilation of Python3 under the vendor/ directory
sudo -s sh -c "mv /usr/local/lib /usr/local/lib0; mv /usr/local/include /usr/local/include0"
# now install pyre-ast
opam install pyre-ast
# recover the renamed directories
sudo -s sh -c "mv /usr/local/lib0 /usr/local/lib; mv /usr/local/include0 /usr/local/include"

Hope this helps!