--- atop-2.12.1.orig/gpucom.c	2025-09-23 19:16:03.000000000 +0200
+++ atop-2.12.1/gpucom.c	2026-07-07 02:03:39.884775016 +0200
@@ -22,7 +22,7 @@
 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 ** See the GNU General Public License for more details.
 */
-#define _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 200809L
 #define _XOPEN_SOURCE
 #define _GNU_SOURCE
 #define _DEFAULT_SOURCE