diff -ur tigervnc-1.2.0.orig/unix/xserver/hw/vnc/Makefile.am tigervnc-1.2.0/unix/xserver/hw/vnc/Makefile.am
--- tigervnc-1.2.0.orig/unix/xserver/hw/vnc/Makefile.am	2011-10-31 09:14:40.000000000 +0100
+++ tigervnc-1.2.0/unix/xserver/hw/vnc/Makefile.am	2012-09-06 19:44:04.431123087 +0200
@@ -5,6 +5,7 @@
 RDR_LIB=$(LIB_DIR)/rdr/librdr.la
 NETWORK_LIB=$(LIB_DIR)/network/libnetwork.la
 XREGION_LIB=$(LIB_DIR)/Xregion/libXregion.la
+OS_LIB=$(LIB_DIR)/os/libos.la
 COMMON_LIBS=$(NETWORK_LIB) $(RFB_LIB) $(RDR_LIB) $(XREGION_LIB)
 
 noinst_LTLIBRARIES = libvnccommon.la
@@ -55,7 +56,7 @@
 
 libvnc_la_LDFLAGS = -module -avoid-version
 
-libvnc_la_LIBADD = libvnccommon.la $(COMMON_LIBS)
+libvnc_la_LIBADD = libvnccommon.la $(COMMON_LIBS) $(OS_LIB)
 
 EXTRA_DIST = Xvnc.man