diff --git a/configure.ac b/configure.ac
index 6517fb2c30..4f71eafafa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1068,6 +1068,7 @@ sys/vcd/Makefile
 sys/vga/Makefile
 sys/xvideo/Makefile
 ext/Makefile
+ext/a52/Makefile
 ext/aalib/Makefile
 ext/alsa/Makefile
 ext/audiofile/Makefile