Configure Error in Mac OS X El Capitan

[vito-royeca]

./configure
...
....

checking for OPENAL... configure: error: Package requirements (openal >= 0.0.8) were not met:

No package 'openal' 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 OPENAL_CFLAGS
and OPENAL_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.