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apt-get source libglib2.0-0
cd /glib2.0-2.24.2/glib

/**
 * g_format_size_for_display:
 * @size: a size in bytes.
 * 
 * Formats a size (for example the size of a file) into a human readable string.
 * Sizes are rounded to the nearest size prefix (KB, MB, GB) and are displayed 
 * rounded to the nearest  tenth. E.g. the file size 3292528 bytes will be
 * converted into the string "3.1 MB".
 *
 * The prefix units base is 1024 (i.e. 1 KB is 1024 bytes).
 *
 * This string should be freed with g_free() when not needed any longer.
 *
 * Returns: a newly-allocated formatted string containing a human readable
 *          file size.
 *
 * Since: 2.16
 **/
char *
g_format_size_for_display (goffset size)
{
  if (size < (goffset) KILOBYTE_FACTOR)
    return g_strdup_printf (g_dngettext(GETTEXT_PACKAGE, "%u byte", "%u bytes",(guint) size), (guint) size);
  else
    {
      gdouble displayed_size;

      if (size < (goffset) MEGABYTE_FACTOR)
        {
          displayed_size = (gdouble) size / (gdouble) KILOBYTE_FACTOR;
          return g_strdup_printf (_("%.1f KB"), displayed_size);
        }
      else if (size < (goffset) GIGABYTE_FACTOR)
        {
          displayed_size = (gdouble) size / (gdouble) MEGABYTE_FACTOR;
          return g_strdup_printf (_("%.1f MB"), displayed_size);
        }
      else if (size < (goffset) TERABYTE_FACTOR)
        {
          displayed_size = (gdouble) size / (gdouble) GIGABYTE_FACTOR;
          return g_strdup_printf (_("%.1f GB"), displayed_size);
        }
      else if (size < (goffset) PETABYTE_FACTOR)
        {
          displayed_size = (gdouble) size / (gdouble) TERABYTE_FACTOR;
          return g_strdup_printf (_("%.1f TB"), displayed_size);
        }
      else if (size < (goffset) EXABYTE_FACTOR)
        {
          displayed_size = (gdouble) size / (gdouble) PETABYTE_FACTOR;
          return g_strdup_printf (_("%.1f PB"), displayed_size);
        }
      else
        {
          displayed_size = (gdouble) size / (gdouble) EXABYTE_FACTOR;
          return g_strdup_printf (_("%.1f EB"), displayed_size);
        }
    }
}

char *
g_format_size_for_display (goffset size)
{
  if (size < (goffset) KILOBYTE_FACTOR)
    return g_strdup_printf (g_dngettext(GETTEXT_PACKAGE, "%u byte", "%u bytes",(guint) size), (guint) size);
  else
    {
      gdouble displayed_size;

      if (size < (goffset) MEGABYTE_FACTOR)
        {
          displayed_size = (gdouble) size / (gdouble) KILOBYTE_FACTOR;
          return g_strdup_printf (_("%.1f KB"), displayed_size);
        }
      else 
        {
          displayed_size = (gdouble) size / (gdouble) MEGABYTE_FACTOR;
          return g_strdup_printf (_("%.2f MB"), displayed_size);
        }
    }
}

apt-get build-dep libglib2.0-0
cd ..
./configure
make
make install