diff -up sage-5.10/spkg/build/sage-5.10/module_list.py.orig sage-5.10/spkg/build/sage-5.10/module_list.py --- sage-5.10/spkg/build/sage-5.10/module_list.py.orig 2013-07-29 20:04:06.006075582 -0300 +++ sage-5.10/spkg/build/sage-5.10/module_list.py 2013-07-29 20:04:18.016076042 -0300 @@ -2042,7 +2042,7 @@ if UNAME[0] == "Darwin" and not UNAME[2] ) -if is_package_installed('lrcalc'): +if 1: ext_modules.append( Extension('sage.libs.lrcalc.lrcalc', sources = ["sage/libs/lrcalc/lrcalc.pyx"],