To compile DGL, cd to the source directory and type "make". This will create DGL 2.0
For DGL 1.0 go to the directory olddgl/source and type "make".
"make install" will strip the DGL executable and move it to the bin directory.
"make lib" will create libdgl.a and move it to the lib directory.
"make clean" will remove any intermediate files created during the make process.
