diff -up sage-5.9/spkg/build/sage-5.9/module_list.py.orig sage-5.9/spkg/build/sage-5.9/module_list.py
--- sage-5.9/spkg/build/sage-5.9/module_list.py.orig	2013-03-19 16:03:38.039687555 -0300
+++ sage-5.9/spkg/build/sage-5.9/module_list.py	2013-03-19 16:03:47.215687907 -0300
@@ -16,7 +16,7 @@ else:
     SAGE_ROOT  = os.environ['SAGE_ROOT']
     SAGE_LOCAL = SAGE_ROOT + '/local'
     SAGE_DEVEL = SAGE_ROOT + '/devel'
-    SAGE_INC = SAGE_LOCAL + '/include/'
+    SAGE_INC = '/usr/include/'
 
 
 #########################################################
@@ -1697,8 +1697,8 @@ ext_modules = [
               sources = ['sage/rings/polynomial/plural.pyx'],
               libraries = ['m', 'readline', 'singular', 'givaro', 'gmpxx', 'gmp'],
               language="c++",
-              include_dirs = [SAGE_ROOT +'/local/include/singular'],
-              depends = [SAGE_ROOT + "/local/include/libsingular.h"],
+              include_dirs = [SAGE_INC + 'singular', SAGE_INC + 'factory'],
+              depends = singular_depends,
               extra_compile_args = givaro_extra_compile_args),
 
     Extension('sage.rings.polynomial.multi_polynomial_libsingular',