open_toontown_panda3d/direct/src/directbase/Sources.pp

#define USE_PACKAGES cg  // from gobj.

#begin lib_target
  #define TARGET directbase
  
  #define SOURCES \
    directbase.cxx directbase.h directsymbols.h \

  #define INSTALL_HEADERS \
    directbase.h directsymbols.h

#end lib_target