The Quake III Arena sources as originally released under the GPL license on August 20, 2005.

code/unix/extract_ver.pl

@@ -0,0 +1,9 @@
+#!/usr/bin/env perl
+# extracting version string from game/q_shared.h
+# hacked from Wolf build process
+
+# extract the wolf version from q_shared.h
+$line = `cat ../game/q_shared.h | grep Q3_VERSION`;
+chomp $line;
+$line =~ s/.*Q3\ (.*)\"/$1/;
+print "$line\n";