Index: mozilla-1.9.2/xulrunner/installer/libxul-embedding.pc.in
===================================================================
--- mozilla-1.9.2/xulrunner/installer/libxul-embedding.pc.in
+++ mozilla-1.9.2/xulrunner/installer/libxul-embedding.pc.in	2009-12-18 13:14:38.000000000 -0500
@@ -6,5 +6,6 @@
 Name: libxul-embedding
 Description: Static library for version-independent embedding of the Mozilla runtime
 Version: %MOZILLA_VERSION%
+Requires: %NSPR_NAME% >= %NSPR_VERSION%
 Libs: -L${sdkdir}/lib -lxpcomglue
 Cflags: -DXPCOM_GLUE -I${includedir} %WCHAR_CFLAGS%