Not much:
Its now brl.glgrahics instead of brl.blitzgl
bglcreatecontext -> glgraphics
bgldrawtext -> gldrawtext
flushmem is not needed anymore unless you use GCSetMode
all other error most likely result because of the interface problem.
Its now brl.glgrahics instead of brl.blitzgl
bglcreatecontext -> glgraphics
bgldrawtext -> gldrawtext
flushmem is not needed anymore unless you use GCSetMode
all other error most likely result because of the interface problem.