--- configure.in
+++ configure.in
@@ -295,6 +295,8 @@
 ],ac_cv_lkstrftime=no,ac_cv_lkstrftime=no])
 AC_MSG_RESULT($ac_cv_lkstrftime)
 
+PKG_PROG_PKG_CONFIG
+
 dnl ********************************************************************************
 dnl security extension support (SSL and S/MIME)
 dnl