--- a/configure	2011-01-01 14:37:30.188000001 -0600
+++ b/configure	2011-01-01 14:40:30.409000001 -0600
@@ -491,6 +491,13 @@
 has_js="system"
 js_lib="-lmozjs"
 else
+#gentoo spidermonkey (mozjs)
+js_flags="-DXP_UNIX -I/usr/include/js"
+js_inc="/usr/include/js"
+if $cc -o $TMPO $TMPC $js_flags -lmozjs 2> /dev/null  ; then
+has_js="system"
+js_lib="-lmozjs"
+else
 #try local
 js_inc="$local_inc/js"
 js_flags="-DXP_UNIX -I$local_inc/js"
@@ -499,6 +506,7 @@
 fi
 fi
 fi
+fi
 fi