sub Build { # my $vcvars32 = 'VCVARS32.BAT'; << comment out these # system ($vcvars32); << two lines # set your environment variables (the same ones # vcvars32.bat sets) like so: $ENV{LIB} = 'D:\MSVCDIR\LIB;'.$ENV{LIB}; $ENV{PATH} = 'D:\MSVCDIR\BIN;'.$ENV{PATH]; system $command; # this now sees the variables set above