We dont have strtol_l on musl so the missing configure.ac check is not
a problem for us. By skipping it we also avoid regenerating configure
script.

diff --git a/libguile/i18n.c b/libguile/i18n.c
index f0e3443..17e9eca 100644
--- a/libguile/i18n.c
+++ b/libguile/i18n.c
@@ -1373,7 +1373,7 @@ SCM_DEFINE (scm_locale_string_to_integer, "locale-string->integer",
 
   if (c_locale != NULL)
     {
-#ifdef USE_GNU_LOCALE_API
+#if defined(USE_GNU_LOCALE_API) && defined(HAVE_STRTOL_L)
       c_result = strtol_l (c_str, &c_endptr, c_base, c_locale);
 #else
       RUN_IN_LOCALE_SECTION (c_locale,
-- 
2.4.3