This hack makes Guile default to UTF-8.  This avoids calls to
`iconv_open'; `iconv_open' tries to open shared objects that aren't
available during bootstrap, so using UTF-8 avoids that (and UTF-8 has
built-in conversions in glibc, too.)

diff --git a/libguile/bytevectors.c b/libguile/bytevectors.c
index cf41f2f..facfb91 100644
--- a/libguile/bytevectors.c
+++ b/libguile/bytevectors.c
@@ -1887,7 +1887,7 @@ utf_encoding_name (char *name, size_t utf_width, SCM endianness)
   if (scm_i_is_narrow_string (str))                                     \
     {                                                                   \
       err = mem_iconveh (scm_i_string_chars (str), c_strlen,            \
-                         "ISO-8859-1", c_utf_name,                      \
+                         "UTF-8", c_utf_name,                      \
                          iconveh_question_mark, NULL,                   \
                          &c_utf, &c_utf_len);                           \
       if (SCM_UNLIKELY (err))                                           \
diff --git a/libguile/ports.c b/libguile/ports.c
index 301bc44..b0ea2e6 100644
--- a/libguile/ports.c
+++ b/libguile/ports.c
@@ -1750,7 +1750,7 @@ scm_ungetc (scm_t_wchar c, SCM port)
   if (pt->encoding != NULL)
     encoding = pt->encoding;
   else
-    encoding = "ISO-8859-1";
+    encoding = "UTF-8";
 
   len = sizeof (result_buf);
   result = u32_conv_to_encoding (encoding,
@@ -2212,7 +2212,7 @@ scm_i_set_port_encoding_x (SCM port, const char *encoding)
   pt = SCM_PTAB_ENTRY (port);
 
   if (encoding == NULL)
-    encoding = "ISO-8859-1";
+    encoding = "UTF-8";
 
   if (pt->encoding != encoding)
     pt->encoding = scm_gc_strdup (encoding, "port");
diff --git a/libguile/posix.c b/libguile/posix.c
index 4f8b8ac..fea7f74 100644
--- a/libguile/posix.c
+++ b/libguile/posix.c
@@ -1740,7 +1740,7 @@ SCM_DEFINE (scm_setlocale, "setlocale", 1, 1, 0,
       SCM_SYSERROR;
     }
 
-  enc = locale_charset ();
+  enc = "UTF-8";
 
   /* Set the default encoding for new ports.  */
   scm_i_set_default_port_encoding (enc);
diff --git a/libguile/script.c b/libguile/script.c
index 83daf8a..083891e 100644
--- a/libguile/script.c
+++ b/libguile/script.c
@@ -387,7 +387,7 @@ locale_arguments_to_string_list (int argc, char **const argv)
   SCM lst;
   const char *encoding;
 
-  encoding = environ_locale_charset ();
+  encoding = "UTF-8";
   for (i = argc - 1, lst = SCM_EOL;
        i >= 0;
        i--)
diff --git a/libguile/strings.c b/libguile/strings.c
index 5d0db23..8266247 100644
--- a/libguile/strings.c
+++ b/libguile/strings.c
@@ -1576,7 +1576,7 @@ scm_from_locale_string (const char *str)
 SCM
 scm_from_locale_stringn (const char *str, size_t len)
 {
-  return scm_from_stringn (str, len, locale_charset (),
+  return scm_from_stringn (str, len, "UTF-8",
                            scm_i_default_port_conversion_handler ());
 }
 
@@ -1803,7 +1803,7 @@ char *
 scm_to_locale_stringn (SCM str, size_t *lenp)
 {
   return scm_to_stringn (str, lenp,
-                         locale_charset (),
+                         "UTF-8",
                          scm_i_default_port_conversion_handler ());
 }
 
@@ -2054,7 +2054,7 @@ scm_to_stringn (SCM str, size_t *lenp, const char *encoding,
                         "string contains #\\nul character: ~S",
                         scm_list_1 (str));
 
-  if (scm_i_is_narrow_string (str) && (encoding == NULL))
+  if (scm_i_is_narrow_string (str))
     {
       /* If using native Latin-1 encoding, just copy the string
          contents.  */
@@ -2079,11 +2079,11 @@ scm_to_stringn (SCM str, size_t *lenp, const char *encoding,
   len = 0;
   enc = encoding;
   if (enc == NULL)
-    enc = "ISO-8859-1";
+    enc = "UTF-8";
   if (scm_i_is_narrow_string (str))
     {
       ret = mem_iconveh (scm_i_string_chars (str), ilen,
-                         "ISO-8859-1", enc,
+                         "UTF-8", enc,
                          (enum iconv_ilseq_handler) handler, NULL,
                          &buf, &len);
 
