For mac need before unix:

```factor
    { [ os macosx? ] [ "libpcre.dylib" ] }
```

Also, if I add that, it has 4 failing tests due to memory errors, thoughts?

```
IN: scratchpad :test-failures

==== resource:extra/pcre/info/info-tests.factor

resource:extra/pcre/info/info-tests.factor: 7

Unit Test: {
    [ { { 3 "day" } { 2 "month" } { 1 "year" } } ]
    [
        "(?P<year>\\d{4})-(?P<month>\\d{2})-(?P<day>\\d{2})"
        <compiled-pcre> nametable>>
    ]
}

Memory protection fault at address 13b4bd11
[Traceback]

==== resource:extra/pcre/pcre-tests.factor

resource:extra/pcre/pcre-tests.factor: 43

Unit Test: {
    [
        {
            { f "1999-01-12" }
            { "year" "1999" }
            { "month" "01" }
            { "day" "12" }
        }
    ]
    [ "1999-01-12" iso-date <compiled-pcre> findall first ]
}

Memory protection fault at address 11d9c161
[Traceback]

resource:extra/pcre/pcre-tests.factor: 47

Unit Test: {
    [ 3 ]
    [
        "2003-10-09 1999-09-01 1514-10-20" iso-date
        <compiled-pcre> findall length
    ]
}

Memory protection fault at address 11e0c101
[Traceback]

resource:extra/pcre/pcre-tests.factor: 120

Unit Test: {
    [ t ]
    [
        "http://factorcode.org/" http-get nip
        "href=\"(?P<link>[^\"]+)\"" findall [ "link" of ] map
        sequence?
    ]
}

Memory protection fault at address 1236c6b1
[Traceback]
```