10.1. Integration with 'configure.in'
Declaring your use of libtool in the project's 'configure.in' is a simple matter of adding the 'AC_PROG_LIBTOOL' (or 'AM_PROG_LIBTOOL' if you have an older automake or libtool installation) somewhere near the top of the file. I always put it immediately after the other 'AC_PROG_…' macros. If you are converting an old project to use libtool, you also need to remove any calls to 'AC_PROG_RANLIB'. Because Libtool will be handling all the libraries, it decides whether to call ranlib as appropriate for the build environment.
The code generated by 'AC_PROG_LIBTOOL' relies on the shell variable $top_builddir to hold the relative path to the directory that contains the configure script. If you are using Automake, ...