[MacPorts] #60937: Missing include .h files

[MacPorts]

#60937: Missing include .h files
-----------------------------------------------+--------------------
 Reporter:  vdoublie                           |      Owner:  (none)
     Type:  defect                             |     Status:  new
 Priority:  Normal                             |  Milestone:
Component:  ports                              |    Version:  2.6.99
 Keywords:  bigsur  x86_64  undefined symbols  |       Port:  many
-----------------------------------------------+--------------------
 Many ports fail to build under Xcode 12.0 and macOS11.0 due to failure to
 include required .h files.

 Typical error are (like the one taken from port flex):


 {{{
 :info:build Undefined symbols for architecture x86_64:
 :info:build   "_yylex", referenced from:
 :info:build       _main in libmain.o
 }}}

 this was a warning with previous macOS version and Xcode, it is now an
 error.

-- 
Ticket URL: <https://trac.macports.org/ticket/60937>
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