--- tigervnc-1.3.1/unix/xserver/hw/xwayland/xwayland.c~	2015-01-10 18:03:40.852155058 +0100
+++ tigervnc-1.3.1/unix/xserver/hw/xwayland/xwayland.c	2015-01-10 18:08:58.240164951 +0100
@@ -682,3 +682,8 @@
         FatalError("Couldn't add screen\n");
     }
 }
+
+// never called with Xwayland, satisfy 'os' linked
+// lib externs used only with Xvnc binary
+void vncWriteBlockHandler(fd_set *fds) { }
+void vncWriteWakeupHandler(int nfds, fd_set *fds) { }
--- tigervnc-1.3.1/unix/xserver/hw/vnc/Makefile.am~	2015-01-11 06:02:48.324838411 +0100
+++ tigervnc-1.3.1/unix/xserver/hw/vnc/Makefile.am	2015-01-11 06:34:59.852555819 +0100
@@ -37,7 +37,7 @@
 	-DVENDOR_STRING="\"$(VENDOR_STRING)\"" -I$(TIGERVNC_SRCDIR)/common \
 	-I$(top_srcdir)/include ${XSERVERLIBS_CFLAGS} -I$(includedir)
 
-Xvnc_LDADD = $(XVNC_LIBS) libvnccommon.la $(COMMON_LIBS) \
+Xvnc_LDADD = $(XVNC_LIBS) libvnccommon.la $(COMMON_LIBS) $(OS_LIB) \
 	$(XSERVER_LIBS) $(XSERVER_SYS_LIBS) $(XVNC_SYS_LIBS) -lX11
 
 Xvnc_LDFLAGS = $(LD_EXPORT_SYMBOLS_FLAG)