Description: Debian: Don't autodetect whether semephores are present
 Assume working semaphores, don't rely on running kernel for the check.

 This is not something that's approriate for us to detect at build time.
 Potentially forwadable, if redesigned.

Forwarded: not-needed

--- a/configure.ac
+++ b/configure.ac
@@ -6196,10 +6196,15 @@ AC_CACHE_CHECK([whether POSIX semaphores
   [ac_cv_posix_semaphores_enabled=yes])
 )
 AS_VAR_IF([ac_cv_posix_semaphores_enabled], [no], [
-  AC_DEFINE(
-    [POSIX_SEMAPHORES_NOT_ENABLED], [1],
-    [Define if POSIX semaphores aren't enabled on your system]
-  )
+  case $ac_sys_system in
+    Linux*) # assume yes, see https://launchpad.net/bugs/630511
+      ;;
+    *)
+      AC_DEFINE(
+        [POSIX_SEMAPHORES_NOT_ENABLED], [1],
+        [Define if POSIX semaphores aren't enabled on your system]
+      )
+  esac
 ])
 
 dnl Multiprocessing check for broken sem_getvalue
