diff --git a/configure.ac b/configure.ac
index b1ab0a7..d5071b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -24,6 +24,7 @@
 AC_CONFIG_AUX_DIR([.])
 
 AM_INIT_AUTOMAKE
+PKG_PROG_PKG_CONFIG
 
 AC_ARG_VAR([PY_PREFIX], [Prefix for installing Python modules.
                          (Normal --prefix is ignored for Python because