Configure help

[Bob Rossi]

Hi,

I am having a little trouble using autoconf to configure my package.
Currently, I am tring to build a package that depends on another
package. Basically CGDB (main package) depends on Readline (second
package).

I am using   
   AC_CONFIG_SUBDIRS(readline-5.0)
to configure readline. This works well.

There is 2 problems I need to solve. The first is, since readline is
installed in cgdb/readline-5.0, I need a way of telling 

     AC_CHECK_HEADERS(readline.h history.h)
     AC_CHECK_LIB(readline, readline,
       [AC_DEFINE(HAVE_LIBREADLINE, 1, readline library)],
         AC_MSG_ERROR([Packaged readline failed to build.
         Please submit a bug report.]))

the above 2 commands how to find the installed readline. For instance,
AC_CHECK_LIB does not know to look in cgdb/readline-5.0 for readline.h.
What is the best way to accomplish this? 

Also, AC_CHECK_LIB can not even look for libreadline.a until after the
"make" is done. Is there a way to ./configure && make && make install
the readline package, and then continue with CGDB's configure?

Thanks,
Bob Rossi