O_CLOEXEC does not exist in Debian 6, and apparently EPOLL_CLOEXEC is the correct to use anyway.

uev.c

@@ -37,7 +37,7 @@
 
 static int _init(uev_ctx_t *ctx, int close_old)
 {
-	int fd = epoll_create1(O_CLOEXEC);
+	int fd = epoll_create1(EPOLL_CLOEXEC);
 
 	if (fd < 0)
 		return -1;