I'd like to have a Windows environment variable like MYINCDIR=c:\myincdir that specifies the root of a set of include directories and then use that variable within the -I command-line option of the compiler. I've tried these without success:
-I%MYINCDIR%\foo -I"%MYINCDIR%\foo" -I"%MYINCDIR%"\foo
to no avail.
Is there any way to pick up an environment variable into the -I option?
Thanks, Andrew