FYI. I got it to work with libltdl/libtools 2.2 by enabling the function that uses the new libltdl API as you suggested. Thanks again . If anyone has the same problem, I had to add a patch to the FreeBSD port and upgrade it to FreeRADIUS 2.1.8. The following is the patch I added to the port in addition to having to manually update the pkg-plist. --- src/main/modules.c 2010-01-08 06:43:51.000000000 -0800 +++ src/main/modules.c 2010-01-08 07:48:12.000000000 -0800 @@ -207,9 +207,6 @@ * Solve the issues of libraries linking to other libraries * by using a newer libltdl API. */ -#ifndef HAVE_LT_DLADVISE_INIT -#define fr_dlopenext lt_dlopenext -#else static lt_dlhandle fr_dlopenext(const char *filename) { lt_dlhandle handle = 0; @@ -225,7 +222,6 @@ return handle; } -#endif /* HAVE_LT_DLADVISE_INIT */ #endif /* WITHOUT_LIBLTDL */ static int virtual_server_idx(const char *name)