Heres the rap on how to use scons:
In the root glob2 folder, type: "scons" to compile the program.
In any other folder (like src), type "scons -u" which will do the same thing
as the above command
If you want to change the variables, type "scons CXXFLAGS=whatever" or
alternatively "scons -u CXXFLAGS=whatever", and these options are stored in
a file called options_cache.py. To build libusl, use "scons libusl", to
build the program in tools, type "scons mksprite". To build a distribution
tar, type "scons dist". Its all fairly simple.