Index: configure.in
===================================================================
--- configure.in	(Revision 70541)
+++ configure.in	(Arbeitskopie)
@@ -3766,6 +3766,61 @@
 #endif
 ])
 
+###
+# multiprocessing specific tests
+AC_DEFINE(HAVE_BROKEN_SEM_UNLINK, 0, Define if 'sem_unlink' is broken on your platform)
+AC_DEFINE(HAVE_BROKEN_SEM_GETVALUE, 0, Define if 'sem_getvalue' is broken on your platform)
+
+AC_MSG_CHECKING(for sem_open)
+AC_TRY_COMPILE([#include <semaphore.h>], void *x=sem_open,
+  AC_DEFINE(HAVE_SEM_OPEN, 1, Define if you have the 'sem_open' function.)
+  AC_MSG_RESULT(yes),
+  AC_DEFINE(HAVE_SEM_OPEN, 0)
+  AC_MSG_RESULT(no)
+)
+
+AC_MSG_CHECKING(for sem_timedwait)
+AC_TRY_COMPILE([#include <semaphore.h>], void *x=sem_timedwait,
+  AC_DEFINE(HAVE_SEM_TIMEDWAIT, 1, Define if you have the 'sem_timedwait' function.)
+  AC_MSG_RESULT(yes),
+  AC_DEFINE(HAVE_SEM_TIMEDWAIT, 0)
+  AC_MSG_RESULT(no)
+)
+
+AC_MSG_CHECKING(for sendmsg (fd transfer))
+AC_TRY_COMPILE([#include <sys/socket.h>], 
+  void *x; size_t s; struct msghdr msg;  struct cmsghdr *cmsg;
+  x=sendmsg; 
+  s = CMSG_SPACE(CMSG_LEN(sizeof(int)));
+  cmsg = CMSG_FIRSTHDR(&msg);
+  ,
+  AC_DEFINE(HAVE_FD_TRANSFER, 1, Define if you have the 'sendmsg' function for fd transfer.)
+  AC_MSG_RESULT(yes),
+  AC_DEFINE(HAVE_FD_TRANSFER, 0.)
+  AC_MSG_RESULT(no)
+)
+
+case $ac_sys_system/$ac_sys_release in
+    FreeBSD/4.*|FreeBSD/5.*|FreeBSD/6.*|FreeBSD/7.*|FreeBSD/8.*)
+        # FreeBSD's P1003.1b semaphore support is very experimental
+        # and has many known problems. (as of June 2008)
+        AC_DEFINE(HAVE_SEM_OPEN, 0)
+        AC_DEFINE(HAVE_SEM_TIMEDWAIT, 0)  
+    ;;
+esac
+
+case $ac_sys_system in
+    CYGWIN*)
+        AC_DEFINE(HAVE_BROKEN_SEM_UNLINK, 1)
+        ;;
+    Darwin*)
+        AC_DEFINE(HAVE_BROKEN_SEM_GETVALUE, 1)
+        ;;
+esac
+
+# end of multiprocessing
+###
+
 AC_SUBST(THREADHEADERS)
 
 for h in `(cd $srcdir;echo Python/thread_*.h)`
Index: setup.py
===================================================================
--- setup.py	(Revision 70541)
+++ setup.py	(Arbeitskopie)
@@ -1246,19 +1246,19 @@
 
         elif platform == 'darwin':          # Mac OSX
             macros = dict(
-                HAVE_SEM_OPEN=1,
-                HAVE_SEM_TIMEDWAIT=0,
-                HAVE_FD_TRANSFER=1,
-                HAVE_BROKEN_SEM_GETVALUE=1
+            #    HAVE_SEM_OPEN=1,
+            #    HAVE_SEM_TIMEDWAIT=0,
+            #    HAVE_FD_TRANSFER=1,
+            #    HAVE_BROKEN_SEM_GETVALUE=1
                 )
             libraries = []
 
         elif platform == 'cygwin':          # Cygwin
             macros = dict(
-                HAVE_SEM_OPEN=1,
-                HAVE_SEM_TIMEDWAIT=1,
-                HAVE_FD_TRANSFER=0,
-                HAVE_BROKEN_SEM_UNLINK=1
+            #    HAVE_SEM_OPEN=1,
+            #    HAVE_SEM_TIMEDWAIT=1,
+            #    HAVE_FD_TRANSFER=0,
+            #    HAVE_BROKEN_SEM_UNLINK=1
                 )
             libraries = []
 
@@ -1266,25 +1266,25 @@
             # FreeBSD's P1003.1b semaphore support is very experimental
             # and has many known problems. (as of June 2008)
             macros = dict(                  # FreeBSD
-                HAVE_SEM_OPEN=0,
-                HAVE_SEM_TIMEDWAIT=0,
-                HAVE_FD_TRANSFER=1,
+            #    HAVE_SEM_OPEN=0,
+            #    HAVE_SEM_TIMEDWAIT=0,
+            #    HAVE_FD_TRANSFER=1,
                 )
             libraries = []
 
         elif platform.startswith('openbsd'):
             macros = dict(                  # OpenBSD
-                HAVE_SEM_OPEN=0,            # Not implemented
-                HAVE_SEM_TIMEDWAIT=0,
-                HAVE_FD_TRANSFER=1,
+            #    HAVE_SEM_OPEN=0,            # Not implemented
+            #    HAVE_SEM_TIMEDWAIT=0,
+            #    HAVE_FD_TRANSFER=1,
                 )
             libraries = []
 
         else:                                   # Linux and other unices
             macros = dict(
-                HAVE_SEM_OPEN=1,
-                HAVE_SEM_TIMEDWAIT=1,
-                HAVE_FD_TRANSFER=1
+            #    HAVE_SEM_OPEN=1,
+            #    HAVE_SEM_TIMEDWAIT=1,
+            #    HAVE_FD_TRANSFER=1
                 )
             libraries = ['rt']
 
@@ -1301,7 +1301,7 @@
                                      '_multiprocessing/socket_connection.c'
                                    ]
 
-            if macros.get('HAVE_SEM_OPEN', False):
+            if sysconfig.get_config_var("HAVE_SEM_OPEN"):
                 multiprocessing_srcs.append('_multiprocessing/semaphore.c')
 
         if sysconfig.get_config_var('WITH_THREAD'):