Index: uspace/lib/c/include/math.h
===================================================================
--- uspace/lib/c/include/math.h	(revision 05d893a319c9a10dc1c47a2cadc2688e0d042110)
+++ uspace/lib/c/include/math.h	(revision 5e0ea6f520af8c8faa2c9eeaf59cf6dc8f52bd53)
@@ -1,3 +1,4 @@
 /*
+ * Copyright (c) 2025 Jiri Svoboda
  * Copyright (c) 2018 CZ.NIC, z.s.p.o.
  * All rights reserved.
@@ -30,7 +31,10 @@
 #define _MATH_H
 
+#include <_bits/decls.h>
 #include <limits.h>
 #include <stddef.h>
 #include <float.h>
+
+__C_DECLS_BEGIN;
 
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE) || defined(_HELENOS_SOURCE)
@@ -322,3 +326,5 @@
 #endif
 
+__C_DECLS_END;
+
 #endif /* _MATH_H */