--- acm4-4.7.orig/src/interpolate.h
+++ acm4-4.7/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 */