devkitPro
libmad from pacman and libogc conflict
both the pacman repository (here) and libogc (here) conflict with each other, providing the same lib name but not the same functions. One example of such are all the MP3Player_* functions that are missing in the non-libogc version
The stock templates place the correct libogc paths ahead of the portlibs paths so they shouldn't conflict. Work is still ongoing to clean up libogc and eventually remove the libraries that shouldn't have been added to the libogc source tree in the first place but, until then, it's best to ensure libogc library and include files are in the search paths ahead of portlibs paths.
That is true, as of https://github.com/devkitPro/wii-examples/commit/56fd9dcc25c723e27e5f8213dd77889c0446b4ad libogc should be prioritised over portlibs in my case I was working on older homebrew that used an older template