[AD] Still problems with acodec

[Evert Glebbeek <eglebbk@xxxxxxxxxx>]

Compiling acodec still gives me problems on my Mac. Since it seems to  
be working for everyone else (well, Peter Hull) it must be something  
on the setup of my system.

When using CMake the Ogg/Vorbis files appear to be found properly  
now, but instead I get:

[ 62%] Building C object addons/acodec/CMakeFiles/ 
a5_acodec_shared.dir/ogg.c.o
/Users/eglebbk/Program/Allegro5/4.9/addons/acodec/ogg.c: In function  
'al_load_sample_oggvorbis':
/Users/eglebbk/Program/Allegro5/4.9/addons/acodec/ogg.c:42: error:  
'OV_CALLBACKS_NOCLOSE' undeclared (first use in this function)

etc.

Where is this symbol supposed to be defined? I (recursively) grepped  
for it in the /usr/include/ directory on my Linux system and can't  
find it there either. Google isn't helping very much at the moment  
but I'll keep trying.

When using the XCode project file, I still get complaints about not  
being able to find the libvorbis and libogg libraries. They're  
installed under /sw/, which is presumably why. libvorbis and libogg  
both come with XCode project files to compile them, but I can't  
figure out how to tell XCode to actually install the compiled project  
since there's no clear install target listed. Supplied documentation  
doesn't help either. I'm sure this is more of a problem with their  
supplied files than anything else, but I thought I'd ask anyway.

Evert