initialize PKG_CONFIG varible if empty, fixes previous commit

diff --git a/configure b/configure
index fd30e466d79182de92676de60f91b6d71512bd1a..37a783ccccf75ee9695cac3fe19cd0ce9a87bc80 100755 (executable)
--- a/configure
+++ b/configure
@@ -10,6 +10,7 @@
 # ###########################################################################
 
 ROOTDIR=$(cd "$(dirname "$0")"; pwd)
+test -z "$PKG_CONFIG" && PKG_CONFIG=pkg-config
 
 #
 # Options