[MacPorts] #67864: vis @0.8 fails to build on 10.9 and older

[MacPorts]

#67864: vis @0.8 fails to build on 10.9 and older
--------------------+----------------------
 Reporter:  jmroot  |      Owner:  Raimondi
     Type:  defect  |     Status:  assigned
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  vis
--------------------+----------------------
 It uses `openat` and related constants, which could be provided by
 legacysupport.
 {{{
 sam.c:1682:41: error: use of undeclared identifier 'AT_FDCWD'
                 TextSave *ctx = text_save_begin(text, AT_FDCWD, path,
 file->save_method);
                                                       ^
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67864>
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