1 files changed, 4 insertions, 0 deletions

diff --git a/attract.c b/attract.c
index f4cb7b0..bd7717d 100644
--- a/attract.c
+++ b/attract.c
@@ -8,6 +8,10 @@
 #include <assert.h>
 #include "lodepng.h"
 
+#ifndef CMPLX
+#define CMPLX(r,i) ((r) + (i)*I)
+#endif
+
 const int MAXITER=200;
 const double EPS=1e-1;