Before using a macro, you need to define it, either on the NMAKE command line or in your description file. Command-line macro definitions look like this:
macroname=macrostring
No spaces can surround the equal sign. If you embed spaces, NMAKE might misinterpret your macro. If your macro string contains embedded spaces, enclose it in double quotation marks ( " ) like this:
macroname="macro string"
or simply enclose the entire macro definition in double quotation marks ( " ) like this:
"macroname = macro string"
Macro names can be any combination of alphanumeric characters and the underscore character ( _ ), and they are case-sensitive. A macro string can be any string of characters or a null string.