p11-kit nm issues on leopard

[rmottola (Riccardo)]

ad_max_install_names -arch x86_64 -o p11-kit-client.la -rpath /opt/local/lib/pkcs11 p11-kit/client_la-client.lo p11-kit/client_la-client-init.lo  libp11-kit-internal.la libp11-common.la libp11-library.la -L/opt/local/lib -lffi -L/opt/local/lib -lintl -R/opt/local/lib -Wl,-framework -Wl,CoreFoundation   -lintl 
libtool: link: /usr/bin/nm -p  p11-kit/.libs/libp11_kit_la-proxy.o p11-kit/.libs/libp11_kit_la-proxy-init.o p11-kit/.libs/libp11_kit_la-rpc-server.o   ./.libs/libp11-kit-internal.a ./.libs/libp11-common.a ./.libs/libp11-library.a |  | /usr/bin/sed 's/.* //' | sort | uniq > .libs/libp11-kit.exp
./libtool: eval: line 1717: syntax error near unexpected token `|'
./libtool: eval: line 1717: `/usr/bin/nm -p  p11-kit/.libs/libp11_kit_la-proxy.o p11-kit/.libs/libp11_kit_la-proxy-init.o p11-kit/.libs/libp11_kit_la-rpc-server.o   ./.libs/libp11-kit-internal.a ./.libs/libp11-common.a ./.libs/libp11-library.a |  | /usr/bin/sed 's/.* //' | sort | uniq > .libs/libp11-kit.exp'

I suppose this is the same issue I am seeing on gimp #58834

if {${os.platform} eq "darwin" && ${os.major} < 10} {
    depends_build-append port:cctools
    configure.env-append NM=${prefix}/bin/nm
    configure.args-append lt_cv_path_NM=${prefix}/bin/nm
}