Log Message:
Added patch to fix gnutls includes detection during build. Move libiconv
dependency to the NLS option, which is what requires it. Setting DESTDIR
in INSTALL_ENV is superfluous - removing. Set PKGMANDIR via --mandir in
CONFIGURE_ARGS instead of passing PKGMANDIR in MAKE_ENV. Updated patch to
reflect change. Patches sent upstream. Disable gnutls option by default,
as it requires openssl compatibility, which is currently not supported in 
pkgsrc. Bump PKGREVISION.