Fix the build on OpenBSD, and possibly other BSDs

Author: aperezdc

Makefile

@@ -1,6 +1,6 @@
 MULTICALL = 1
 CFLAGS    = -Os -g -Wall -W
-CFLAGS   += -std=c23
+CFLAGS   += -std=c2x
 PREFIX    = /usr/local
 RST2MAN   = rst2man
 RM        = rm -f

denv.c

@@ -4,6 +4,10 @@
  * SPDX-License-Identifier: MIT
  */
 
+#ifndef __linux
+#define _BSD_SOURCE
+#endif
+
 #define _DEFAULT_SOURCE
 #define _GNU_SOURCE
 #define _POSIX_C_SOURCE 200809L

dmon.c

@@ -5,8 +5,12 @@
  * Distributed under terms of the MIT license.
  */
 
-#define _GNU_SOURCE 1
-#define _POSIX_C_SOURCE 199309L
+#ifndef __linux
+#define _BSD_SOURCE
+#endif
+
+#define _GNU_SOURCE
+#define _POSIX_C_SOURCE 200809L
 
 #include "deps/cflag/cflag.h"
 #include "deps/clog/clog.h"

task.c

@@ -1,12 +1,16 @@
 /*
  * task.c
- * Copyright (C) 2010-2020 Adrian Perez <[email protected]>
+ * Copyright (C) 2010-2024 Adrian Perez <[email protected]>
  *
  * Distributed under terms of the MIT license.
  */
 
-#define _POSIX_C_SOURCE 199309L
+#ifndef __linux
+#define _BSD_SOURCE
+#endif
+
 #define _DEFAULT_SOURCE
+#define _POSIX_C_SOURCE 199309L
 
 #include "task.h"
 #include "deps/clog/clog.h"