Hi Gavai: Use the locate command to find dynamic libraries (.so extension) locate libread | grep "\.so" or to find the static library locate libread | grep "\.a" Have a close look at http://cvs.bioperl.org/cgi-bin/viewcvs/viewcvs.cgi/bioperl-ext/README.diff?r1=1.1&r2=1.2 and specifically the link to ftp://ftp.mrc-lmb.cam.ac.uk/pub/staden/io_lib/ . Pull down the io_lib, untar it, cd into its directory ./configure make find ./ -print | grep -i libread make install On my systems, it placed everything into /usr/local/lib and /usr/local/lib. You can change that if you wish on the ./configure line using --prefix=/path/to/io_lib, but in most cases the default (e.g. do not include the --prefix) is fine. Joe -- Joseph Landman, Ph.D Scalable Informatics LLC, email: landman at scalableinformatics.com web : http://scalableinformatics.com phone: +1 734 612 4615