Fedora Core 4 Compile Problems

I did an install, and am trying to do a build according to the instructions here: http://www.garagegames.com/docs/tge/general/apbs04.php#setupengine.linux.compile.install_build.system_setup

I get build errors when I try to compile the code. I can resolve the resManager.h errors by rewriting the header file, but I'm not ssure how to resolve the errors in event.h.

$ gcc --version
gcc (GCC) 4.0.0 20050519 (Red Hat 4.0.0-8)
Copyright (C) 2005 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Is my problem using gcc version 4? And is there an easy solution?

$ make
--> Compiling audio/audio.cc
'-mcpu=' is deprecated. Use '-mtune=' or '-march=' instead.
./core/resManager.h: In member function 'void Resource::unlock()':
./core/resManager.h:255: error: invalid use of undefined type 'struct ResManager'
./core/resManager.h:38: error: forward declaration of 'struct ResManager'
./core/resManager.h: In member function 'void Resource::purge()':
./core/resManager.h:263: error: invalid use of undefined type 'struct ResManager'
./core/resManager.h:38: error: forward declaration of 'struct ResManager'
./core/resManager.h:265: error: invalid use of undefined type 'struct ResManager'
./core/resManager.h:38: error: forward declaration of 'struct ResManager'
./core/resManager.h: In member function 'void Resource::_unlock()':
./core/resManager.h:278: error: invalid use of undefined type 'struct ResManager'
./core/resManager.h:38: error: forward declaration of 'struct ResManager'
./platform/event.h: At global scope:
./platform/event.h:137: error: a cast to a type other than an integral or enumeration type cannot appear in a constant-expression
./platform/event.h:137: error: '->' cannot appear in a constant-expression
./platform/event.h:137: error: '&' cannot appear in a constant-expression
./platform/event.h:140: error: a cast to a type other than an integral or enumeration type cannot appear in a constant-expression
./platform/event.h:140: error: '->' cannot appear in a constant-expression
./platform/event.h:140: error: '&' cannot appear in a constant-expression
./platform/event.h:143: error: a cast to a type other than an integral or enumeration type cannot appear in a constant-expression
./platform/event.h:143: error: '->' cannot appear in a constant-expression
./platform/event.h:143: error: '&' cannot appear in a constant-expression
audio/audio.cc: In function 'int loopingImageSort(const void*, const void*)':
audio/audio.cc:161: warning: converting to 'int' from 'float'
audio/audio.cc: In function 'int streamingSourceSort(const void*, const void*)':
audio/audio.cc:193: warning: converting to 'int' from 'float'
audio/audio.cc: In function 'AUDIOHANDLE alxCreateSource(const Audio::Description*, const char*, const MatrixF*, AudioSampleEnvironment*)':
audio/audio.cc:707: warning: converting to non-pointer type 'ALuint' from NULL
audio/audio.cc: In function 'ALuint alxGetWaveLen(ALuint)':
audio/audio.cc:2092: warning: converting to 'ALuint' from 'F64'
make[1]: *** [out.GCC3.DEBUG/audio/audio.obj] Error 1
make: *** [default] Error 2