--- rxvt-unicode/src/rxvtutil.h	2014/11/12 12:12:02	1.62
+++ rxvt-unicode/src/rxvtutil.h	2019/06/25 03:35:01	1.64
@@ -3,7 +3,10 @@
 
 #include <stdlib.h>
 #include <string.h>
+
+#define ECB_NO_THREADS 1
 #include "ecb.h"
+
 #include "estl.h"
 
 #include "emman.h"
@@ -24,8 +27,6 @@
 template<typename T, typename U, typename V> static inline T    clamp    (T  v, U a, V b) { return v < (T)a ? a : v >(T)b ? b : v; }
 template<typename T, typename U, typename V> static inline void clamp_it (T &v, U a, V b) {    v = v < (T)a ? a : v >(T)b ? b : v; }
 
-template<typename T> static inline T squared_diff (T a, T b) { return (a - b) * (a - b); }
-
 // linear interpolation
 template<typename T, typename U, typename P>
 static inline T