ReaderWriterATTR.cpp had a variable "mips" defined, which is predefined for the IRIX preprocessor.
Changed this to _mips.
FltFile.cpp had a class and transient variable defined within the scope of member function
FltFile::readExternals(), which was causing the IRIX 7.3 compiles to hork. Moved the class
definition to outside of the member function scope.
Modified osg/Drawable::draw(..) so that it uses display list COMPILE
rather than COMPILE_AND_EXECUTE to solve performance problems under
NVidia drivers. The old behavior is still available by comments out
a #define.
Fixed the default compilation list src/osgPlugins/Makefile so that it
compiles by defalt png and gif.
