diff -up primus-master/primusrun.nouveaufix primus-master/primusrun
--- primus-master/primusrun.nouveaufix	2012-12-11 06:00:06.000000000 -0500
+++ primus-master/primusrun	2013-01-02 17:39:48.634165376 -0500
@@ -15,6 +15,12 @@
 # $LIB will be interpreted by the dynamic linker
 # export PRIMUS_libGLa=${PRIMUS_libGLa:-'/usr/$LIB/nvidia-bumblebee/libGL.so.1'}

+if [ ! -d /usr/$LIB/nvidia-bumblebee ]; then
+     # nouveau driver is present
+     export PRIMUS_libGLa=${PRIMUS_libGLa:-'/usr/$LIB/libGL.so.1'}
+fi
+
+
 # "Displaying" libGL
 # export PRIMUS_libGLd=${PRIMUS_libGLd:-'/usr/$LIB/libGL.so.1'}