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all:
    echo NODEBUG=$(NODEBUG)
    echo ADDED_CFLAGS=$(ADDED_CFLAGS)

my $cmd = q|nmake /s NODEBUG=1 "ADDED_CFLAGS=/DCOST_EN_US /DPAYMENT_CR
+EDIT_CARD"|;
open(my $fr_nmake, '-|', "$cmd 2>&1") or die;
print <$fr_nmake>;
close($fr_nmake);

>perl 655027.pl

...
NODEBUG=1
ADDED_CFLAGS=/DCOST_EN_US /DPAYMENT_CREDIT_CARD

my @cmd = ('nmake', '/s', 'NODEBUG=1', 'ADDED_CFLAGS=/DCOST_EN_US /DPA
+YMENT_CREDIT_CARD');
my $cmd = join ' ', map quotemeta, @cmd;
open(my $fr_nmake, '-|', "$cmd 2>&1") or die;
print <$fr_nmake>;
close($fr_nmake);