--- /dev/null
+#!/usr/bin/perl
+#
+# checkincludes: Find files included more than once in (other) files.
+# Copyright abandoned, 2000, Niels Kristian Bech Jensen <nkbj@image.dk>.
+
+foreach $file (@ARGV) {
+ open(FILE, $file) or die "Cannot open $file: $!.\n";
+
+ my %includedfiles = ();
+
+ while (<FILE>) {
+ if (m/^\s*#\s*include\s*[<"](\S*)[>"]/o) {
+ ++$includedfiles{$1};
+ }
+ }
+ foreach $filename (keys %includedfiles) {
+ if ($includedfiles{$filename} > 1) {
+ print "$file: $filename is included more than once.\n";
+ }
+ }
+
+ close(FILE);
+}