--- a/configure.ac
+++ b/configure.ac
@@ -1404,6 +1404,13 @@
 #endif
 ])
 
+# On Linux, irda.h requires sys/socket.h  
+AC_CHECK_HEADERS(linux/irda.h,,,[   
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h> 
+#endif
+])
+
 # checks for typedefs
 was_it_defined=no
 AC_MSG_CHECKING(for clock_t in time.h)