diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
index f1b611920503072d8556b39d33ea28c9a745a9aa..c1e5c4bd9d3adea7155dfc3b5e964c06842a103d 100644 (file)
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
# define isinf(a) (fpclassify(a) == FP_INFINITE)
#endif
+#if HAVE_MATH_H
+#include <math.h>
+#endif
+
#include <stdio.h>
int main(void){
double rrdnan,rrdinf,rrdc,rrdzero;