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-rw-r--r--tests/test-isfinite.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/tests/test-isfinite.c b/tests/test-isfinite.c
index 2d718e2ccc..fc2f23c0d9 100644
--- a/tests/test-isfinite.c
+++ b/tests/test-isfinite.c
@@ -21,6 +21,11 @@
#include <math.h>
+/* isfinite must be a macro. */
+#ifndef isfinite
+# error missing declaration
+#endif
+
#include <float.h>
#include <limits.h>
#include <stdio.h>