BUGS list for gltt lib

- IRIX Users:
  Don't forget to remove any "config.cache" file before running
  configure again.
  If you are trying to build GLTT with the native IRIX C++ compiler,
  the Makefile will try to create the library with the
  command "libtool CC --mode=link ...". This appears to be buggy
  to libtool. Run it again as: "libtool gcc --mode=link ..."

