[MacPorts] #64046: Can't build py27-ngl on macOS 11.6

[MacPorts]

#64046: Can't build py27-ngl on macOS 11.6
--------------------+--------------------
 Reporter:  catap   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 It produces tons of warnings and one error:
 {{{
 hlu_wrap.c:4278:21: error: implicit declaration of function 'c_cssgrid' is
 invalid in C99 [-Werror,-Wimplicit-function-declaration]
   result = (float
 *)c_cssgrid(arg1,arg2,arg3,arg4,arg5,arg6,arg7,arg8,arg9);
                     ^
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64046>
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