GNU Autoconf, Automake, and Libtool

19.1. A Module-Loading Subsystem

As you saw in Chapter 17, "Using GNU libltdl," I need to put an invocation of the macro 'AC_LIBTOOL_DLOPEN' just before 'AC_PROG_LIBTOOL', in the file 'configure.in'. But, as well as being able to use libtoolize --ltdl, which adds libltdl in a subdirectory with its own subconfigure, you can also manually copy just the ltdl source files into your project^[1] , and use AC_LIB_LTDL in your existing 'configure.in'. At the time of writing, this is still a very new and (as yet) undocumented feature, with a few kinks that need to be ironed out. In any case, you probably should not use this method to add 'ltdl.lo' to a C++ library, because 'ltdl.c' is written in C. If you do want to use libltdl with a C++ library, things ...