Index: utils/transcode.cpp
--- utils/transcode.cpp.orig
+++ utils/transcode.cpp
@@ -29,6 +29,10 @@
 #include "rclutil.h"
 #include "simdutf.h"
 
+#ifndef ICONV_CONST
+#define ICONV_CONST
+#endif
+
 using namespace std;
 
 // iconv_open caching
