Index: configure.ac
===================================================================
--- configure.ac	(revision 81956)
+++ configure.ac	(working copy)
@@ -25,6 +25,7 @@
 AC_CONFIG_MACRO_DIR([m4])
 AC_CANONICAL_BUILD
 AC_CANONICAL_HOST
+PKG_PROG_PKG_CONFIG
 
 AC_CONFIG_HEADERS([config.h])
 AH_TOP([