--- extconf.rb.old	2010-04-25 17:45:58.549626368 +0200
+++ extconf.rb	2010-04-25 17:46:03.269752270 +0200
@@ -59,6 +59,7 @@
 add_depend_package("gtk2", "gtk/src", TOPDIR)
 
 if have_library("xpcomglue")
+  $CFLAGS << " -I/usr/include/nspr "
   have_header("gtkmozembed_glue.cpp") or exit 1
   CONFIG['LDSHARED'].gsub!(/\$\(CC\)/, "$(CXX)")
 elsif have_library("gtkembedmoz")