gmake INST_TOP=C:\perl_app\bin\Perl CCHOME=C:\msys64\mingw64 EMAIL=customer_support@xyz.com
gmake test INST_TOP=C:\perl_app\bin\Perl CCHOME=C:\msys64\mingw64 EMAIL=customer_support@xyz.com
gmake install INST_TOP=C:\perl_app\bin\Perl CCHOME=C:\msys64\mingw64 EMAIL=customer_support@xyz.com

##</code><code>##

#EMAIL        *=

##</code><code>##

#EMAIL		:=

##</code><code>##

EMAIL        := customer_support@xyz.com

##</code><code>##

EMAIL        *= customer_support@xyz.com