--- tk-8.6.6.ebuild.old	2016-08-28 16:00:23.689289567 -0400
+++ tk-8.6.6.ebuild.old	2016-08-28 16:00:39.821181797 -0400
@@ -82,6 +82,11 @@ 
 }
 
 multilib_src_configure() {
+	if tc-is-cross-compiler ; then
+		export ac_cv_func_strtod=yes
+		export tcl_cv_strtod_buggy=1
+	fi
+
 	local mylibdir=$(get_libdir)
 
 	econf \