Linking an external library with a libtool shared library

[platter]

Hello all,

I am repackaging a shared library using Automake, Autoconf, and Libtool.  I
am running into a problem.

I would like the installation to check for the existence of the pthread
library, and if it is installed on the target host, I would like the package
to link to the existing library so that the user of the shared library doesn't
have to manually also link to pthread.

I have been reading the Autoconf, Automake, and Libtool manuals, as well as
the Autobook, without success on this issue.

Does anyone know how to do this?

Thanks,

John