Backport 2.1: Use "#!/usr/bin/env perl" as shebang line.
diff --git a/scripts/massif_max.pl b/scripts/massif_max.pl
index d1ce4ca..4e3342a 100755
--- a/scripts/massif_max.pl
+++ b/scripts/massif_max.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 # Parse a massif.out.xxx file and output peak total memory usage