--- src/m4/ac_check_iconv.m4.orig	2016-09-04 11:56:39.334457000 +0200
+++ src/m4/ac_check_iconv.m4	2016-09-04 11:54:17.189348000 +0200
@@ -6,7 +6,7 @@
 dnl
 AC_DEFUN([AC_CHECK_ICONV],
 [dnl	Check for the iconv header file
-AC_CHECK_HEADERS(iconv.h)
+AC_CHECK_HEADERS(iconv.h wchar.h)
 
 dnl No point going on if iconv.h isn't present.
 dnl In this case, we just assume iconv can not be used by the application