Linux] OpenAL errors when compiling TGE 1.5.0

I'm trying to compile Torque Game Engine 1.5.0 in Ubuntu 8.04. Here's What I do:

make -f mk/configure.mk OS=LINUX COMPILER=GCC4 BUILD=DEBUG
make clean
make

It seems to successfully compile the /lpng, /zlib, and /ljpeg portions, but then I get this:

--> Compiling audio/audio.cc
In file included from ./game/gameBase.h:16,
from ./game/shapeBase.h:10,
from ./game/gameConnection.h:13,
from audio/audio.cc:11:
./dgl/gTexManager.h:428:26: warning: no newline at end of file
In file included from ./platform/platformAL.h:25,
from ./platform/platformAudio.h:16,
from ./audio/audio.h:10,
from audio/audio.cc:6:
../lib/openal/LINUX/al/al_func.h:18: error: '' has incomplete type
../lib/openal/LINUX/al/al_func.h:18: error: invalid use of 'ALvoid'
In file included from ./platform/platformAL.h:26,
from ./platform/platformAudio.h:16,
from ./audio/audio.h:10,
from audio/audio.cc:6:
../lib/openal/LINUX/al/alc_func.h:11: error: '' has incomplete type
../lib/openal/LINUX/al/alc_func.h:11: error: invalid use of 'ALCvoid'
audio/audio.cc: In function 'bool cullSource(U32*, F32)':
audio/audio.cc:252: error: too few arguments to function
audio/audio.cc: In function 'AUDIOHANDLE alxCreateSource(const Audio::Description*, const char*, const MatrixF*, AudioSampleEnvironment*)':
audio/audio.cc:731: error: too few arguments to function
audio/audio.cc: In function 'void alxLoopingUpdate()':
audio/audio.cc:1732: error: too few arguments to function
audio/audio.cc: In function 'void alxStreamingUpdate()':
audio/audio.cc:1833: error: too few arguments to function
audio/audio.cc: In function 'bool Audio::OpenALInit()':
audio/audio.cc:2414: error: too few arguments to function
audio/audio.cc:2419: error: too few arguments to function
audio/audio.cc:2441: error: too few arguments to function
make[1]: *** [out.GCC4.DEBUG/audio/audio.obj] Error 1
make: *** [default] Error 2


I've checked and I have the latest versions of all of the dependencies, and I am totally stumped. Does anybody have any suggestions?