diff -ur bowtie-0.12.7/scripts/gen_dnamasks2colormask.pl bowtie-0.12.7.new/scripts/gen_dnamasks2colormask.pl
--- bowtie-0.12.7/scripts/gen_dnamasks2colormask.pl	2010-06-06 15:36:31.000000000 +0100
+++ bowtie-0.12.7.new/scripts/gen_dnamasks2colormask.pl	2011-06-27 22:56:01.673782736 +0100
@@ -1,3 +1,4 @@
+#!/usr/bin/perl -w
 print "uint8_t dnamasks2colormask[16][16] = {\n";
 print "\t         /* 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15 */\n";
 my %color = (