Backport 2.1: Use "#!/usr/bin/env perl" as shebang line.
diff --git a/scripts/generate_errors.pl b/scripts/generate_errors.pl
index cc9527e..3687bd4 100755
--- a/scripts/generate_errors.pl
+++ b/scripts/generate_errors.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#!/usr/bin/env perl
 
 # Generate error.c
 #