--- a/src/devices/ib/GPI2_IB.h	2025-09-12 13:25:31.564181121 +0200
+++ b/src/devices/ib/GPI2_IB.h	2025-09-12 13:24:49.105422150 +0200
@@ -26,6 +26,9 @@ along with GPI-2. If not, see <http://ww
 
 #include "GPI2_Dev.h"
 
+/* Missing prototype as driver.h is now private */
+int ibv_read_sysfs_file(const char *dir, const char *file, char *buf, size_t size);
+
 #define GASPI_GID_INDEX   (0)
 #define PORT_LINK_UP      (5)
 #define MAX_INLINE_BYTES  (128)