--- acm-5.0.orig/src/interpolate.h
+++ acm-5.0/src/interpolate.h
@@ -31,8 +31,6 @@
 
 #include <math.h>
 
-typedef float float_t;
-
 typedef struct {
 	float_t   x;				/* upper x value for this interval */
 	float_t   m;				/* slope of line in this interval */