http://bugs.gentoo.org/137532

--- configure
+++ configure
@@ -21246,8 +21246,8 @@
   RASQAL_EXTERNAL_CPPFLAGS="$RASQAL_EXTERNAL_CPPFLAGS $C"
   RASQAL_EXTERNAL_LIBS="$RASQAL_EXTERNAL_LIBS $L"
 
-  PKGCONFIG_CFLAGS="PKGCONFIG_CFLAGS $C"
-  PKGCONFIG_LIBS="PKGCONFIG_LIBS $L"
+  PKGCONFIG_CFLAGS="$PKGCONFIG_CFLAGS $C"
+  PKGCONFIG_LIBS="$PKGCONFIG_LIBS $L"
   unset C
   unset L
 fi