Fixed path comparison in cases where symlinks to python executables are used.

Signed-off-by: Sven Schrader <sven.schrader@gmail.com>
Signed-off-by: Sven Rebhan <odinshorse@googlemail.com>
Signed-off-by: Jochen Eppler <jougs@gmx.net>

--- distutils/command/build_ext.py	2009-05-20 14:02:07.039240200 +0200
+++ distutils/command/build_ext.py.new	2009-05-20 14:06:55.491335213 +0200
@@ -186,7 +186,7 @@
         # for extensions under Cygwin and AtheOS Python's library directory must be
         # appended to library_dirs
         if sys.platform[:6] == 'cygwin' or sys.platform[:6] == 'atheos':
-            if sys.executable.startswith(os.path.join(sys.exec_prefix, "bin")):
+            if os.path.samefile(os.path.join(sys.exec_prefix, "bin"), os.path.dirname(sys.executable)):
                 # building third party extensions
                 self.library_dirs.append(os.path.join(sys.prefix, "lib",
                                                       "python" + get_python_version(),
@@ -199,7 +199,7 @@
         # Python's library directory must be appended to library_dirs
         if (sys.platform.startswith('linux') or sys.platform.startswith('gnu')) \
                 and sysconfig.get_config_var('Py_ENABLE_SHARED'):
-            if sys.executable.startswith(os.path.join(sys.exec_prefix, "bin")):
+            if os.path.samefile(os.path.join(sys.exec_prefix, "bin"), os.path.dirname(sys.executable)):
                 # building third party extensions
                 self.library_dirs.append(sysconfig.get_config_var('LIBDIR'))
             else: