Hi, I have a autoconf/automake/libtool project with libraries, which works for 32 bit processor. How can I convert this to a x86_64-aware project? That is, when compiled on AMD64, it will compile for 64 bit and install libs in lib64 directory. when compiled on 32bit linux, it will compile for 32 bit and install libs in lib directory. I have seen the configure option "--enable-libsuffix=64" on this list. I don't see how to use this option to rewrite "configure.ac" and "Makefile.am". A sample "configure.ac" and "Makefile.am" would be appreciated. Tosa -- Yasunari Tosa, Ph.D. Email: tosa@nmr.mgh.harvard.edu NMR Ctr, Mass. General Hospital TEL: 617-726-4050 Building 149, 13th Street Charlestown, MA 02129 USA