Index: numpy/distutils/system_info.py
===================================================================
--- numpy/distutils/system_info.py	(revision 8325)
+++ numpy/distutils/system_info.py	(working copy)
@@ -201,7 +201,7 @@
     default_x11_include_dirs = ['/usr/X11R6/include','/usr/X11/include',
                                 '/usr/include']
 
-if os.path.join(sys.prefix, 'lib') not in default_lib_dirs:
+if hasattr(sys, "prefix") and os.path.join(sys.prefix, 'lib') not in default_lib_dirs:
     default_lib_dirs.insert(0,os.path.join(sys.prefix, 'lib'))
     default_include_dirs.append(os.path.join(sys.prefix, 'include'))
     default_src_dirs.append(os.path.join(sys.prefix, 'src'))
Index: numpy/distutils/ccompiler.py
===================================================================
--- numpy/distutils/ccompiler.py	(revision 8325)
+++ numpy/distutils/ccompiler.py	(working copy)
@@ -19,10 +19,6 @@
 
 # hack to set compiler optimizing options. Needs to integrated with something.
 import distutils.sysconfig
-_old_init_posix = distutils.sysconfig._init_posix
-def _new_init_posix():
-    _old_init_posix()
-    distutils.sysconfig._config_vars['OPT'] = '-Wall -g -O0'
 #distutils.sysconfig._init_posix = _new_init_posix
 
 def replace_method(klass, method_name, func):