Including a makefile engine from both nmake and gnumake

# how to include a file named from the environment with both nmake and gnumake
# this should allow creating templates and makefile engines that do work with both
# François Revol (mmu_man)
# this code is in the public domain

# MAGIC: DO NOT TOUCH
#\
!if "$(MAKE)" == "NMAKE"
#\
!include $(SOMEMKENGINE)
#\
!else
include $(SOMEMKENGINE)
#\
!endif