>  You can try "ifeq -else -endif " directive in the makefile.
> I hope this is what you are looking for
but i want to access environment variables. Can you please explain its usage in
more details.

consider this example.
if user says. "make single". now the make file should executed rules for 
single cpp file.
but if user says "make combined", make file should execute rule for
the combined file.

-- 
________________________________________________________________
"Only two things are infinite, the
universe and human stupidity, and I'm not sure about the former." -- Einstein.

- Vikram Karandikar
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