In order to add the mapscript python build steps to the buildbot we should separate the mapserver build directory and the base directory for the libraries.
I would suggest adding MS_CURRENT as:
!IFNDEF MS_CURRENT
MS_CURRENT = $(MS_BASE)
!ENDIF
And mapscriptvars would use MS_CURRENT instead of MS_BASE like:
mapscriptvars: makefile.vc nmake.opt
-del mapscriptvars
echo $(MS_CURRENT) > mapscriptvars
echo $(MS_DEFS) -DWIN32 -D_WIN32 >> mapscriptvars
echo $(INCLUDES) >> mapscriptvars
echo $(LIBS_DLL) >> mapscriptvars
echo $(LIBS) >> mapscriptvars
findstr MS_VERSION mapserver.h | findstr define >> mapscriptvars
