diff -ur gtk-sharp-2.12.6/configure.in gtk-sharp-2.12.6.new/configure.in
--- gtk-sharp-2.12.6/configure.in	2008-11-05 22:54:52 +0300
+++ gtk-sharp-2.12.6.new/configure.in	2008-11-27 00:45:21 +0300
@@ -202,6 +202,7 @@
 fi
 AC_SUBST(MDASSEMBLER)
 AC_SUBST(MONODOCER)
+AC_SUBST(doc_sources_dir)
 
 AM_CONDITIONAL(ENABLE_MONO_CAIRO, test "x$enable_mono_cairo" = "xyes")
 AM_CONDITIONAL(ENABLE_GLADE, test "x$enable_glade" = "xyes")
diff -ur gtk-sharp-2.12.6/doc/Makefile.am gtk-sharp-2.12.6.new/doc/Makefile.am
--- gtk-sharp-2.12.6/doc/Makefile.am	2008-08-27 19:35:31 +0400
+++ gtk-sharp-2.12.6.new/doc/Makefile.am	2008-11-27 00:45:56 +0300
@@ -20,7 +20,7 @@
 UPDATER = $(MONODOCER) -path:en -pretty $(UPDATE_ASSEMBLIES)
 
 if ENABLE_MONODOC
-SOURCESDIR=$(prefix)/lib/monodoc/sources
+SOURCESDIR=$(doc_sources_dir)
 TARGETS=gtk-sharp-docs.zip gtk-sharp-docs.tree gtk-sharp-docs.source
 else
 SOURCESDIR=$(datadir)