No word named “dlsym?” found in current vocabulary search path

gistfile1.txt

IN: alien.libraries
GENERIC: dlsym? ( name string/dll -- ? )
M: string dlsym? dup lookup-library [ nip dll>> dlsym? ] [ no-library-named ] if* ;
M: dll dlsym? dlsym >boolean ;

IN: secure
MEMO: best-tls-method ( -- class )
    {
        { [ "TLSv1_2_method" "libssl" dlsym? ] [ TLSv1.2 ] }
        { [ "TLSv1_1_method" "libssl" dlsym? ] [ TLSv1.1 ] }
        { [ "TLSv1_method" "libssl" dlsym? ] [ TLSv1 ] }
        [ no-tls-supported ]
    } cond ;


/Users/davec/.factor-rc

1: USING: accessors assocs debugger io io.encodings.utf8 io.files
3:  ui.tools.listener vectors vocabs.loader io.servers sets binary-search ;
                                                      ^
resource:basis/io/servers/servers.factor

3: USING: accessors arrays calendar combinators
7: io io.sockets io.sockets.secure io.streams.duplex io.styles
                                  ^
resource:basis/io/sockets/secure/secure.factor

26:         { [ "TLSv1_2_method" "libssl" dlsym? ] [ TLSv1.2 ] }
                                                ^
No word named “dlsym?” found in current vocabulary search path