Add check for epoll(), sys/epoll.h

configure.in

@@ -886,6 +886,11 @@ dnl ----------------------------------------------------------------
 AC_CHECK_FUNCS( poll )
 AC_CHECK_HEADERS( poll.h )
 
+dnl ----------------------------------------------------------------
+AC_CHECK_FUNC(epoll_create, AC_DEFINE(HAVE_EPOLL,1,
+			[define if you have epoll]))
+AC_CHECK_HEADERS( sys/epoll.h )
+
 dnl ----------------------------------------------------------------
 # strerror checks
 OL_STRERROR

include/portable.h.in

@@ -548,6 +548,9 @@
 /* Define if you have the <sys/dir.h> header file.  */
 #undef HAVE_SYS_DIR_H
 
+/* Define if you have the <sys/epoll.h> header file.  */
+#undef HAVE_SYS_EPOLL_H
+
 /* Define if you have the <sys/errno.h> header file.  */
 #undef HAVE_SYS_ERRNO_H
 
@@ -698,6 +701,9 @@
 /* define if you have winsock2 */
 #undef HAVE_WINSOCK2
 
+/* define if you have epoll */
+#undef HAVE_EPOLL
+
 /* define if sys_errlist is not declared in stdio.h or errno.h */
 #undef DECL_SYS_ERRLIST