my $skipabi = shift;
# to catch multiple abi-prev-* files being passed in
-die "invalid value for skipabi parameter\n"
- if (defined($skipabi) && $skipabi !~ /^[01]$/);
+die "invalid value '$skipabi' for skipabi parameter\n" if defined($skipabi) && $skipabi !~ /^[01]$/;
$abinew =~ /abi-(.*)/;
my $abistr = $1;