the rawhide version of mutt fails with a 'buffer overflow' error, because of the size check of the 2nd parameter of function realpath(). tmp is defined as a char tmp[_POSIX_PATH_MAX], but its size is expected to be at least PATH_MAX (4096 vs 256) in the glibc check from realpath_chk.c:30

char *
__realpath_chk (const char *buf, char *resolved, size_t resolvedlen)
{
#ifdef PATH_MAX
  if (resolvedlen < PATH_MAX)
    __chk_fail ();

  return __realpath (buf, resolved);
#else