https://bugs.winehq.org/show_bug.cgi?id=50436
--- Comment #5 from Sveinar Søpler cybermax@dexter.no --- Hmm.. it could maybe look like a typo in configure perhaps? I would assume so, even tho configure finds the right libraries when it is installed in system folders (by other means i guess... -lFAudio flag and such).
running: pkg-config --cflags faudio produces an error for me aswell, but using pkg-config --cflags FAudio does not.
So it seems this is a bug.
Not sure what would be the correct approach when generating the .pc file - after all it is kinda up to the end-user/distro to choose build flags, and possible scripts generating this in the .pc file. One thing i am fairly certain of, is that it is not a wine issue.
The configure script is tho :)