Index: trunk/psphot/src/psphotEfficiency.c
===================================================================
--- trunk/psphot/src/psphotEfficiency.c	(revision 33963)
+++ trunk/psphot/src/psphotEfficiency.c	(revision 33993)
@@ -420,5 +420,9 @@
 
     // psphotFitSourcesLinearReadout subtracts the model fits
+# if (HAVE_MODEL_VAR)
     if (!psphotFitSourcesLinearReadout(recipe, readout, fakeSourcesAll, psf, true, PM_SOURCE_PHOTFIT_CONST)) {
+# else
+    if (!psphotFitSourcesLinearReadout(recipe, readout, fakeSourcesAll, psf, true)) {
+# endif
         psError(PS_ERR_UNKNOWN, false, "Unable to perform linear fit on fake sources.");
         psFree(fakeSources);