--- rpl/configure.ac	2011/10/03 15:57:51	1.3
+++ rpl/configure.ac	2011/10/04 19:32:33	1.4
@@ -196,6 +196,17 @@ AC_SUBST(ABI)
 AC_SUBST(RPLCAS)
 AC_SUBST(LIBRPLCAS)
 
+AC_ARG_ENABLE(shared-memory,
+[  --enable-shared-memory  enable shared memory [[default=yes]]], [
+if test "$enableval" = "no"; then
+	SHARED_MEMORY="-USHARED_MEMORY"
+else
+	SHARED_MEMORY="-DSHARED_MEMORY"
+fi],[
+	SHARED_MEMORY="-USHARED_MEMORY"])
+
+AC_SUBST(SHARED_MEMORY)
+
 dnl Options
 AC_ARG_ENABLE(optimization,
 [  --enable-optimization   set compiler flags [[default=environment variables -O3]]], [