[MacPorts] #61916: frei0r-plugins fails on big sur due to implicit strcmp

[MacPorts]

#61916: frei0r-plugins fails on big sur due to implicit strcmp
--------------------------+----------------------------
 Reporter:  ShadSterling  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.4
 Keywords:  bigsur        |       Port:  frei0r-plugins
--------------------------+----------------------------
 {{{
 :info:build In file included from
 filter/cairoimagegrid/cairoimagegrid.c:27:
 :info:build ../include/frei0r_cairo.h:63:6: error: implicitly declaring
 library function 'strcmp' with type 'int (const char *, const char *)'
 [-Werror,-Wimplicit-function-declaration]
 :info:build   if(strcmp(op, NORMAL) == 0)
 :info:build      ^
 :info:build ../include/frei0r_cairo.h:63:6: note: include the header
 <string.h> or explicitly provide a declaration for 'strcmp'
 :info:build 1 error generated.
 }}}

 This came up in reinstalling everything on Big Sur, frei0r-plugins is not
 requested.

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Ticket URL: <https://trac.macports.org/ticket/61916>
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