diff --git a/gjs.changes b/gjs.changes
index 9acf77d..2eaa2d4 100644
--- a/gjs.changes
+++ b/gjs.changes
@@ -1,3 +1,15 @@
+-------------------------------------------------------------------
+Fri Jun 17 09:49:37 CEST 2011 - vuntz@opensuse.org
+
+- Make it possible to build against js instead of xulrunner. This
+  is controlled by a build_with_xulrunner define:
+  + if it's set to a value other than 0, we keep the previous
+    behavior.
+  + if it's set to 0, we ignore all the xulrunner-related
+    BuildRequires and Requires, and instead use a
+    pkgconfig(mozjs185) BuildRequires.
+- Stop pretending we build against xulrunner from old openSUSE.
+
 -------------------------------------------------------------------
 Wed Jun 15 12:31:48 CEST 2011 - dimstar@opensuse.org
 
diff --git a/gjs.spec b/gjs.spec
index 1d72ffb..7fb598d 100644
--- a/gjs.spec
+++ b/gjs.spec
@@ -15,16 +15,10 @@
 # Please submit bugfixes or comments via http://bugs.opensuse.org/
 #
 
+# Set to 1 to build with xulrunner, else we build with js
+%define build_with_xulrunner 0
 
-%if 0%{suse_version} > 1130
 %define xulrunner_ver 20
-%else
-%if 0%{suse_version} > 1120
-%define xulrunner_ver 192
-%else
-%define xulrunner_ver 191
-%endif
-%endif
 
 Name:           gjs
 Version:        1.29.0
@@ -36,13 +30,18 @@ Group:          Development/Libraries/GNOME
 Url:            http://live.gnome.org/Gjs
 Source:         %{name}-%{version}.tar.bz2
 BuildRequires:  gcc-c++
+%if %{build_with_xulrunner}
 BuildRequires:  mozilla-xulrunner%{xulrunner_ver}-devel
+%endif
 BuildRequires:  python
 BuildRequires:  readline-devel
 BuildRequires:  systemtap-sdt-devel
 BuildRequires:  pkgconfig(cairo)
 BuildRequires:  pkgconfig(dbus-glib-1)
 BuildRequires:  pkgconfig(gobject-introspection-1.0)
+%if ! %{build_with_xulrunner}
+BuildRequires:  pkgconfig(mozjs185)
+%endif
 Requires:       libgjs0 = %{version}
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
@@ -54,9 +53,11 @@ Mozilla SpiderMonkey JavaScript engine.
 License:        MIT License (or similar)
 Summary:        JavaScript bindings based on gobject-introspection and Mozilla
 Group:          Development/Libraries/GNOME
+%if %{build_with_xulrunner}
 # Explicitly requires the xulrunner version we need, instead of hoping we'll
 # get the right one with the libmozjs.so Requires.
 Requires:       mozilla-xulrunner%{xulrunner_ver}
+%endif
 Provides:       libgjs-0 = %{version}
 Obsoletes:      libgjs-0 < %{version}
 
@@ -69,7 +70,9 @@ License:        MIT License (or similar)
 Summary:        JavaScript bindings based on gobject-introspection and Mozilla
 Group:          Development/Libraries/GNOME
 Requires:       libgjs0 = %{version}
+%if %{build_with_xulrunner}
 Requires:       mozilla-xulrunner%{xulrunner_ver}-devel
+%endif
 # Just a helper provides
 Provides:       gjs-devel = %{version}