My-Computer:~ me$ cat testframework.cpp
#include <al.h>
int main() {}

My-Computer:~ me$ g++ -Wall -F /Library/Frameworks/ -framework OpenAL testframework.cpp
testframework.cpp:1:16: al.h: No such file or directory
My-Computer:~ me$ find /Library/Frameworks/OpenAL.framework/
/Library/Frameworks/OpenAL.framework/
/Library/Frameworks/OpenAL.framework//Headers
/Library/Frameworks/OpenAL.framework//OpenAL
/Library/Frameworks/OpenAL.framework//Resources
/Library/Frameworks/OpenAL.framework//Versions
/Library/Frameworks/OpenAL.framework//Versions/A
/Library/Frameworks/OpenAL.framework//Versions/A/Headers
/Library/Frameworks/OpenAL.framework//Versions/A/Headers/al.h
/Library/Frameworks/OpenAL.framework//Versions/A/Headers/alc.h
/Library/Frameworks/OpenAL.framework//Versions/A/Headers/alctypes.h
/Library/Frameworks/OpenAL.framework//Versions/A/Headers/altypes.h
/Library/Frameworks/OpenAL.framework//Versions/A/Headers/alut.h
/Library/Frameworks/OpenAL.framework//Versions/A/OpenAL
/Library/Frameworks/OpenAL.framework//Versions/A/Resources
/Library/Frameworks/OpenAL.framework//Versions/A/Resources/English.lproj
/Library/Frameworks/OpenAL.framework//Versions/A/Resources/English.lproj/InfoPlist.strings
/Library/Frameworks/OpenAL.framework//Versions/A/Resources/Info.plist
/Library/Frameworks/OpenAL.framework//Versions/A/Resources/pbdevelopment.plist
/Library/Frameworks/OpenAL.framework//Versions/A/Resources/READ_ME
/Library/Frameworks/OpenAL.framework//Versions/Current
My-Computer:~ me$