diff --git a/mbuni/ChangeLog b/mbuni/ChangeLog
index bc502a3..7146778 100644
--- a/mbuni/ChangeLog
+++ b/mbuni/ChangeLog
@@ -1,5 +1,6 @@
 2011-01-05 P. A. Bagyenda <bagyenda@dsmagic.com>
 	* Added strip-prefixes option for each mmsc connection (mmsbox)
+	* Fixed building of shared libs on mac os x
 2011-01-04  P. A. Bagyenda <bagyenda@dsmagic.com>
 	* mm1 mmsbox plugin fix Thanks to  Piotr Isajew (pki at ex.com.pl)
 2011-01-03 P. A. Bagyenda <bagyenda@dsmagic.com>
diff --git a/mbuni/configure.ac b/mbuni/configure.ac
index 8c53553..f321a6d 100644
--- a/mbuni/configure.ac
+++ b/mbuni/configure.ac
@@ -80,6 +80,7 @@ case "$host" in
   *apple-darwin*) 
     CFLAGS="$CFLAGS -DDARWIN=1 -O4 -Wall -D_REENTRANT=1" 
     LIB_EXT="dylib"
+    allow_undefined_flag='-flat_namespace -undefined suppress'
     ;;
   *-linux*)
     CFLAGS="$CFLAGS -D_XOPEN_SOURCE=600 -D_BSD_SOURCE -O4 -Wall -D_REENTRANT=1"