Re: how to link with installed libltdl?

[Howard Chu]

Andreas Jellinghaus wrote:
> Hi,
>
> for opensc and related projects we came to the conclusion
> it is best to require the user to install libltdl.so and
> header files, and then link to that library.
>
> Is there a recommended way to implement this in autoconf?
> In the documentation it looks like all scenarios copy
> libltdl into the source, but we don't want to do that.

In OpenLDAP's configure.in we use

    AC_CHECK_HEADERS(ltdl.h)

    if test $ac_cv_header_ltdl_h = no ; then
        AC_MSG_ERROR([could not locate libtool ltdl.h])
    fi

    AC_CHECK_LIB(ltdl, lt_dlinit, [
        MODULES_LIBS=-lltdl
        AC_DEFINE(HAVE_LIBLTDL,1,[define if you have libtool -ltdl])
    ])

    if test "$ac_cv_lib_ltdl_lt_dlinit" = no ; then
        AC_MSG_ERROR([could not locate libtool -lltdl])
    fi

--
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc
  OpenLDAP Core Team            http://www.openldap.org/project/