1 files changed, 1 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index 948468b..205019a 100644
--- a/eval.c
+++ b/eval.c
@@ -16,6 +16,7 @@
  */
 
 #include <errno.h>
+#include <math.h>
 #include <stdlib.h>
 #include <string.h>