diff -ruN mesa-25.0.7/src/util/detect_os.h mesa-25.0.7-banan_os/src/util/detect_os.h
--- mesa-25.0.7/src/util/detect_os.h	2025-05-28 18:20:23.000000000 +0300
+++ mesa-25.0.7-banan_os/src/util/detect_os.h	2025-06-17 14:04:20.625567958 +0300
@@ -76,6 +76,11 @@
 #define DETECT_OS_WINDOWS 1
 #endif
 
+#if defined(__banan_os__)
+#define DETECT_OS_BANAN_OS 1
+#define DETECT_OS_POSIX 1
+#endif
+
 #if defined(__HAIKU__)
 #define DETECT_OS_HAIKU 1
 #define DETECT_OS_POSIX 1
@@ -113,6 +118,9 @@
 #ifndef DETECT_OS_FREEBSD
 #define DETECT_OS_FREEBSD 0
 #endif
+#ifndef DETECT_OS_BANAN_OS
+#define DETECT_OS_BANAN_OS 0
+#endif
 #ifndef DETECT_OS_HAIKU
 #define DETECT_OS_HAIKU 0
 #endif