Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -1464,13 +1464,20 @@
 	AC_CHECK_MEMBER(struct sockaddr_un.sun_path, [
 		AC_DEFINE(OF_HAVE_UNIX_SOCKETS, 1,
 			[Whether we have UNIX sockets])
 		AC_SUBST(USE_SRCS_UNIX_SOCKETS, '${SRCS_UNIX_SOCKETS}')
 	], [], [
+		#ifdef OF_HAVE_SYS_TYPES_H
+		# include <sys/types.h>
+		#endif
 		#ifdef OF_HAVE_SYS_UN_H
 		# include <sys/un.h>
 		#endif
+
+		#ifdef __morphos__
+		# error MorphOS has the struct but does not support it
+		#endif
 	])
 
 	AC_CHECK_FUNCS(paccept accept4, break)
 
 	AC_CHECK_FUNCS(kqueue1 kqueue, [

Index: src/OFSocket.h
==================================================================
--- src/OFSocket.h
+++ src/OFSocket.h
@@ -132,11 +132,11 @@
 # define sipx_network sa_netnum
 # define sipx_node sa_nodenum
 # define sipx_port sa_socket
 #endif
 
-#ifndef OF_HAVE_UNIX_SOCKETS
+#if !defined(OF_HAVE_UNIX_SOCKETS) && !defined(OF_MORPHOS)
 struct sockaddr_un {
 	sa_family_t sun_family;
 	char sun_path[108];
 };
 #endif