diff --git a/meson.build b/meson.build
index c873b9b6..b9a108a6 100644
--- a/meson.build
+++ b/meson.build
@@ -125,7 +125,9 @@ foreach ident : [
         conf.set10('HAVE_' + ident[0].to_upper(), have)
 endforeach
 
+conf.set('_GNU_SOURCE', true)
 conf.set('_FILE_OFFSET_BITS', 64)
+conf.set('__STDC_FORMAT_MACROS', true)
 
 libfuse = dependency('fuse3', required : false)
 if libfuse.found()
diff --git a/src/api_extensions.h b/src/api_extensions.h
index 9ee55daf..77f69e71 100644
--- a/src/api_extensions.h
+++ b/src/api_extensions.h
@@ -3,11 +3,11 @@
 #ifndef __LXCFS_API_EXTENSIONS_H
 #define __LXCFS_API_EXTENSIONS_H
 
+#include "config.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 
-#include "config.h"
-
 /*
  * api_extensions is the list of all API extensions in the order they were
  * added.
diff --git a/src/bindings.c b/src/bindings.c
index dc4da142..eb62ddbd 100644
--- a/src/bindings.c
+++ b/src/bindings.c
@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <dirent.h>
diff --git a/src/bindings.h b/src/bindings.h
index 4e033628..a278aa7a 100644
--- a/src/bindings.h
+++ b/src/bindings.h
@@ -14,11 +14,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include "cgroup_fuse.h"
 #include "macro.h"
diff --git a/src/cgroup_fuse.c b/src/cgroup_fuse.c
index cfdf7701..5c22fd15 100644
--- a/src/cgroup_fuse.c
+++ b/src/cgroup_fuse.c
@@ -1,12 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
-#define __STDC_FORMAT_MACROS
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/cgroup_fuse.h b/src/cgroup_fuse.h
index 494dac70..c2315230 100644
--- a/src/cgroup_fuse.h
+++ b/src/cgroup_fuse.h
@@ -11,11 +11,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include "macro.h"
 
diff --git a/src/cgroups/cgfsng.c b/src/cgroups/cgfsng.c
index eb951b40..b0d26569 100644
--- a/src/cgroups/cgfsng.c
+++ b/src/cgroups/cgfsng.c
@@ -12,10 +12,6 @@
  * a comma-separated list of controllers.
  */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <ctype.h>
diff --git a/src/cgroups/cgroup.c b/src/cgroups/cgroup.c
index 7aec7aed..5bf7f62d 100644
--- a/src/cgroups/cgroup.c
+++ b/src/cgroups/cgroup.c
@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <dirent.h>
diff --git a/src/cgroups/cgroup.h b/src/cgroups/cgroup.h
index c9ea3700..122e8ebf 100644
--- a/src/cgroups/cgroup.h
+++ b/src/cgroups/cgroup.h
@@ -3,22 +3,13 @@
 #ifndef __LXC_CGROUP_H
 #define __LXC_CGROUP_H
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#ifndef FUSE_USE_VERSION
-#define FUSE_USE_VERSION 26
-#endif
-
-#define _FILE_OFFSET_BITS 64
+#include "config.h"
 
 #include <errno.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <sys/types.h>
 
-#include "../config.h"
 #include "../macro.h"
 #include "../memory_utils.h"
 
diff --git a/src/cgroups/cgroup2_devices.c b/src/cgroups/cgroup2_devices.c
index 06d258fa..e2eab796 100644
--- a/src/cgroups/cgroup2_devices.c
+++ b/src/cgroups/cgroup2_devices.c
@@ -2,10 +2,6 @@
 
 /* Parts of this taken from systemd's implementation. */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <errno.h>
diff --git a/src/cgroups/cgroup2_devices.h b/src/cgroups/cgroup2_devices.h
index 67a2da8c..6de10216 100644
--- a/src/cgroups/cgroup2_devices.h
+++ b/src/cgroups/cgroup2_devices.h
@@ -5,15 +5,7 @@
 #ifndef __LXC_CGROUP2_DEVICES_H
 #define __LXC_CGROUP2_DEVICES_H
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#ifndef FUSE_USE_VERSION
-#define FUSE_USE_VERSION 26
-#endif
-
-#define _FILE_OFFSET_BITS 64
+#include "config.h"
 
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/cgroups/cgroup_utils.c b/src/cgroups/cgroup_utils.c
index f4ae4ccf..83e4cbf7 100644
--- a/src/cgroups/cgroup_utils.c
+++ b/src/cgroups/cgroup_utils.c
@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <fcntl.h>
diff --git a/src/cgroups/cgroup_utils.h b/src/cgroups/cgroup_utils.h
index 8576e5e4..f4316866 100644
--- a/src/cgroups/cgroup_utils.h
+++ b/src/cgroups/cgroup_utils.h
@@ -3,15 +3,7 @@
 #ifndef __LXC_CGROUP_UTILS_H
 #define __LXC_CGROUP_UTILS_H
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#ifndef FUSE_USE_VERSION
-#define FUSE_USE_VERSION 26
-#endif
-
-#define _FILE_OFFSET_BITS 64
+#include "config.h"
 
 #include <fcntl.h>
 #include <stdarg.h>
@@ -25,7 +17,6 @@
 #include <sys/vfs.h>
 #include <unistd.h>
 
-#include "../config.h"
 #include "../macro.h"
 #include "../memory_utils.h"
 
diff --git a/src/cpuset_parse.c b/src/cpuset_parse.c
index c2edbc04..e511bb02 100644
--- a/src/cpuset_parse.c
+++ b/src/cpuset_parse.c
@@ -1,15 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
-#define _FILE_OFFSET_BITS 64
-
-#define __STDC_FORMAT_MACROS
-
 #include <stdio.h>
 #include <string.h>
 #include <stdbool.h>
diff --git a/src/cpuset_parse.h b/src/cpuset_parse.h
index 5ff8e668..33243457 100644
--- a/src/cpuset_parse.h
+++ b/src/cpuset_parse.h
@@ -3,11 +3,7 @@
 #ifndef __LXCFS_CPUSET_PARSE_H
 #define __LXCFS_CPUSET_PARSE_H
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#define _FILE_OFFSET_BITS 64
+#include "config.h"
 
 #include <stdbool.h>
 #include <stdio.h>
diff --git a/src/lxcfs.c b/src/lxcfs.c
index b6e404d0..56355967 100644
--- a/src/lxcfs.c
+++ b/src/lxcfs.c
@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <alloca.h>
@@ -28,11 +24,7 @@
 #include <sys/socket.h>
 #include <linux/limits.h>
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include "bindings.h"
 #include "lxcfs_fuse_compat.h"
@@ -607,7 +599,7 @@ static int do_sys_releasedir(const char *path, struct fuse_file_info *fi)
 	return __sys_releasedir(path, fi);
 }
 
-#ifdef HAVE_FUSE3
+#if HAVE_FUSE3
 static int lxcfs_getattr(const char *path, struct stat *sb, struct fuse_file_info *fi)
 #else
 static int lxcfs_getattr(const char *path, struct stat *sb)
@@ -678,7 +670,7 @@ static int lxcfs_opendir(const char *path, struct fuse_file_info *fi)
 	return -ENOENT;
 }
 
-#ifdef HAVE_FUSE3
+#if HAVE_FUSE3
 static int lxcfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
 			 off_t offset, struct fuse_file_info *fi, enum fuse_readdir_flags flags)
 #else
@@ -926,7 +918,7 @@ int lxcfs_mkdir(const char *path, mode_t mode)
 	return -EPERM;
 }
 
-#ifdef HAVE_FUSE3
+#if HAVE_FUSE3
 int lxcfs_chown(const char *path, uid_t uid, gid_t gid, struct fuse_file_info *fi)
 #else
 int lxcfs_chown(const char *path, uid_t uid, gid_t gid)
@@ -955,7 +947,7 @@ int lxcfs_chown(const char *path, uid_t uid, gid_t gid)
  * really make sense for cgroups.  So just return 0 always but do
  * nothing.
  */
-#ifdef HAVE_FUSE3
+#if HAVE_FUSE3
 int lxcfs_truncate(const char *path, off_t newsize, struct fuse_file_info *fi)
 #else
 int lxcfs_truncate(const char *path, off_t newsize)
@@ -984,7 +976,7 @@ int lxcfs_rmdir(const char *path)
 	return -EPERM;
 }
 
-#ifdef HAVE_FUSE3
+#if HAVE_FUSE3
 int lxcfs_chmod(const char *path, mode_t mode, struct fuse_file_info *fi)
 #else
 int lxcfs_chmod(const char *path, mode_t mode)
@@ -1008,7 +1000,7 @@ int lxcfs_chmod(const char *path, mode_t mode)
 	return -ENOENT;
 }
 
-#ifdef HAVE_FUSE3
+#if HAVE_FUSE3
 static void *lxcfs_init(struct fuse_conn_info *conn, struct fuse_config *cfg)
 #else
 static void *lxcfs_init(struct fuse_conn_info *conn)
@@ -1048,11 +1040,11 @@ const struct fuse_operations lxcfs_ops = {
 
 	.create		= NULL,
 	.destroy	= NULL,
-#ifndef HAVE_FUSE3
+#if !HAVE_FUSE3
 	.fgetattr	= NULL,
 #endif
 	.fsyncdir	= NULL,
-#ifndef HAVE_FUSE3
+#if !HAVE_FUSE3
 	.ftruncate	= NULL,
 	.getdir		= NULL,
 #endif
@@ -1066,7 +1058,7 @@ const struct fuse_operations lxcfs_ops = {
 	.statfs		= NULL,
 	.symlink	= NULL,
 	.unlink		= NULL,
-#ifndef HAVE_FUSE3
+#if !HAVE_FUSE3
 	.utime		= NULL,
 #endif
 };
@@ -1181,7 +1173,7 @@ int main(int argc, char *argv[])
 	char *pidfile = NULL, *token = NULL;
 	char pidfile_buf[STRLITERALLEN(RUNTIME_PATH) + STRLITERALLEN("/lxcfs.pid") + 1] = {};
 	bool debug = false, foreground = false;
-#ifndef HAVE_FUSE3
+#if !HAVE_FUSE3
 	bool nonempty = false;
 #endif
 	bool load_use = false;
@@ -1307,7 +1299,7 @@ int main(int argc, char *argv[])
 
 			/* default with fuse3 */
 			if (strcmp(token, "nonempty") == 0) {
-				#ifndef HAVE_FUSE3
+				#if !HAVE_FUSE3
 				nonempty = true;
 				#endif
 				continue;
@@ -1327,7 +1319,7 @@ int main(int argc, char *argv[])
 		goto out;
 	}
 
-#ifndef HAVE_FUSE3
+#if !HAVE_FUSE3
 	if (nonempty) {
 		if (append_comma_separate(&new_fuse_opts, "nonempty")) {
 			lxcfs_error("Failed to copy fuse argument \"nonempty\"");
diff --git a/src/lxcfs_fuse.h b/src/lxcfs_fuse.h
new file mode 100644
index 00000000..e4b2c1e0
--- /dev/null
+++ b/src/lxcfs_fuse.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#ifndef __LXCFS_FUSE_H
+#define __LXCFS_FUSE_H
+
+#include "config.h"
+
+#include "lxcfs_fuse_compat.h"
+
+#if HAVE_FUSE3
+#include <fuse3/fuse.h>
+#else
+#include <fuse.h>
+#endif
+
+#endif /* __LXCFS_FUSE_H */
diff --git a/src/lxcfs_fuse_compat.h b/src/lxcfs_fuse_compat.h
index 9c61af04..fcf2da2f 100644
--- a/src/lxcfs_fuse_compat.h
+++ b/src/lxcfs_fuse_compat.h
@@ -3,13 +3,12 @@
 #ifndef __LXCFS_FUSE_COMPAT_H
 #define __LXCFS_FUSE_COMPAT_H
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
+#include "config.h"
 
-#ifdef HAVE_FUSE3
+#if HAVE_FUSE3
 #define DIR_FILLER(F,B,N,S,O) F(B,N,S,O,FUSE_FILL_DIR_PLUS)
 #else
 #define DIR_FILLER(F,B,N,S,O) F(B,N,S,O)
 #endif
+
 #endif /* __LXCFS_FUSE_COMPAT_H */
diff --git a/src/macro.h b/src/macro.h
index b9abf11a..caa0126f 100644
--- a/src/macro.h
+++ b/src/macro.h
@@ -3,20 +3,10 @@
 #ifndef __LXCFS_MACRO_H
 #define __LXCFS_MACRO_H
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
-#ifndef FUSE_USE_VERSION
-#define FUSE_USE_VERSION 26
-#endif
-
-#define _FILE_OFFSET_BITS 64
+#include "config.h"
 
 #include <stdio.h>
 
-#include "config.h"
-
 #define BATCH_SIZE 50
 
 /* filesystem magic values */
diff --git a/src/memory_utils.h b/src/memory_utils.h
index 2916f566..c689c8ec 100644
--- a/src/memory_utils.h
+++ b/src/memory_utils.h
@@ -3,6 +3,8 @@
 #ifndef __LXCFS_MEMORY_UTILS_H
 #define __LXCFS_MEMORY_UTILS_H
 
+#include "config.h"
+
 #include <dirent.h>
 #include <errno.h>
 #include <stdio.h>
diff --git a/src/proc_cpuview.c b/src/proc_cpuview.c
index b3bed6d0..472d69df 100644
--- a/src/proc_cpuview.c
+++ b/src/proc_cpuview.c
@@ -1,12 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
-#define __STDC_FORMAT_MACROS
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/proc_cpuview.h b/src/proc_cpuview.h
index 15511e96..32eee540 100644
--- a/src/proc_cpuview.h
+++ b/src/proc_cpuview.h
@@ -10,11 +10,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include "macro.h"
 
diff --git a/src/proc_fuse.c b/src/proc_fuse.c
index 80dc9a32..4ac5d44b 100644
--- a/src/proc_fuse.c
+++ b/src/proc_fuse.c
@@ -1,12 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
-#define __STDC_FORMAT_MACROS
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/proc_fuse.h b/src/proc_fuse.h
index 2c1f5727..c97d60c7 100644
--- a/src/proc_fuse.h
+++ b/src/proc_fuse.h
@@ -5,11 +5,7 @@
 
 #include "config.h"
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/src/proc_loadavg.c b/src/proc_loadavg.c
index b70437a9..5f9bec79 100644
--- a/src/proc_loadavg.c
+++ b/src/proc_loadavg.c
@@ -1,12 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
-#define __STDC_FORMAT_MACROS
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/proc_loadavg.h b/src/proc_loadavg.h
index bb6a78b1..e6ae2ded 100644
--- a/src/proc_loadavg.h
+++ b/src/proc_loadavg.h
@@ -11,11 +11,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include "macro.h"
 
diff --git a/src/syscall_numbers.h b/src/syscall_numbers.h
index 41eb5dcc..c9006af3 100644
--- a/src/syscall_numbers.h
+++ b/src/syscall_numbers.h
@@ -2,9 +2,8 @@
 #ifndef __LXCFS_SYSCALL_NUMBERS_H
 #define __LXCFS_SYSCALL_NUMBERS_H
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE 1
-#endif
+#include "config.h"
+
 #include <asm/unistd.h>
 #include <errno.h>
 #include <sched.h>
diff --git a/src/sysfs_fuse.c b/src/sysfs_fuse.c
index 4525b69e..b07464c7 100644
--- a/src/sysfs_fuse.c
+++ b/src/sysfs_fuse.c
@@ -1,17 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
-/* Taken over modified from the kernel sources. */
-#define NBITS 32 /* bits in uint32_t */
-#define DIV_ROUND_UP(n, d) (((n) + (d)-1) / (d))
-#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, NBITS)
-
-#define __STDC_FORMAT_MACROS
 #include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
@@ -47,6 +37,11 @@
 #include "lxcfs_fuse_compat.h"
 #include "utils.h"
 
+/* Taken over modified from the kernel sources. */
+#define NBITS 32 /* bits in uint32_t */
+#define DIV_ROUND_UP(n, d) (((n) + (d)-1) / (d))
+#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, NBITS)
+
 static ssize_t get_max_cpus(char *cpulist)
 {
 	char *c1, *c2;
diff --git a/src/sysfs_fuse.h b/src/sysfs_fuse.h
index f151af7f..a80d3d82 100644
--- a/src/sysfs_fuse.h
+++ b/src/sysfs_fuse.h
@@ -11,11 +11,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include "macro.h"
 
diff --git a/src/utils.c b/src/utils.c
index 99271854..b826b2ef 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -1,12 +1,7 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
-#define _FILE_OFFSET_BITS 64
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
diff --git a/src/utils.h b/src/utils.h
index e19eba49..18d85a73 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -13,11 +13,7 @@
 #include <sys/syscall.h>
 #include <unistd.h>
 
-#if HAVE_FUSE3
-#include <fuse3/fuse.h>
-#else
-#include <fuse.h>
-#endif
+#include "lxcfs_fuse.h"
 
 #include "macro.h"
 #include "syscall_numbers.h"
diff --git a/tests/cpusetrange.c b/tests/cpusetrange.c
index 38eea26b..50af4ff5 100644
--- a/tests/cpusetrange.c
+++ b/tests/cpusetrange.c
@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <stdio.h>
diff --git a/tests/test-read.c b/tests/test-read.c
index 9166dde8..2929c35a 100644
--- a/tests/test-read.c
+++ b/tests/test-read.c
@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <stdio.h>
diff --git a/tests/test_syscalls.c b/tests/test_syscalls.c
index f0dbf455..56137f21 100644
--- a/tests/test_syscalls.c
+++ b/tests/test_syscalls.c
@@ -1,9 +1,5 @@
 /* SPDX-License-Identifier: LGPL-2.1+ */
 
-#ifndef _GNU_SOURCE
-#define _GNU_SOURCE
-#endif
-
 #include "config.h"
 
 #include <errno.h>