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-rw-r--r--lib/isnanf-nolibm.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/isnanf-nolibm.h b/lib/isnanf-nolibm.h
index 4ce81d6c..520b8147 100644
--- a/lib/isnanf-nolibm.h
+++ b/lib/isnanf-nolibm.h
@@ -1,5 +1,5 @@
/* Test for NaN that does not need libm.
- Copyright (C) 2007-2022 Free Software Foundation, Inc.
+ Copyright (C) 2007-2024 Free Software Foundation, Inc.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
@@ -14,6 +14,11 @@
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
+/* This file uses HAVE_ISNANF_IN_LIBC. */
+#if !_GL_CONFIG_H_INCLUDED
+ #error "Please include config.h first."
+#endif
+
#if HAVE_ISNANF_IN_LIBC
/* Get declaration of isnan macro or (older) isnanf function. */
# include <math.h>