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-rw-r--r--xorg-server/include/os.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/xorg-server/include/os.h b/xorg-server/include/os.h
index d906834f1..68f405714 100644
--- a/xorg-server/include/os.h
+++ b/xorg-server/include/os.h
@@ -88,7 +88,9 @@ extern void ddxBeforeReset(void);
#endif
#ifdef DDXOSVERRORF
-extern _X_EXPORT void (*OsVendorVErrorFProc) (const char *, va_list args);
+extern _X_EXPORT void (*OsVendorVErrorFProc) (const char *,
+ va_list args)
+_X_ATTRIBUTE_PRINTF(1, 0);
#endif
extern _X_EXPORT int WaitForSomething(int * /*pClientsReady */