See https://bugs.gentoo.org/show_bug.cgi?id=577290

diff -Naur geoclue-2.4.1.orig/src/geocode-glib/geocode-glib.c geoclue-2.4.1/src/geocode-glib/geocode-glib.c
--- geoclue-2.4.1.orig/src/geocode-glib/geocode-glib.c	2015-09-07 12:17:11.000000000 +0000
+++ geoclue-2.4.1/src/geocode-glib/geocode-glib.c	2016-03-12 23:47:52.876000000 +0000
@@ -190,7 +190,7 @@
 	return geocode_object_get_lang_for_locale (setlocale (LC_MESSAGES, NULL));
 }
 
-#ifdef __GLIBC__
+#if defined(__GLIBC__) && !defined(__UCLIBC__)
 static gpointer
 is_number_after_street (gpointer data)
 {
@@ -223,7 +223,7 @@
 gboolean
 _geocode_object_is_number_after_street (void)
 {
-#ifndef __GLIBC__
+#if !defined(__GLIBC__) || defined(__UCLIBC__)
 	return FALSE;
 #else
 	static GOnce once = G_ONCE_INIT;