[MacPorts] #64420: argyll @2.2.1_1 fails to compile on macOS 12.1

[MacPorts]

#64420: argyll @2.2.1_1 fails to compile on macOS 12.1
-------------------------+-----------------------------
 Reporter:  dwightkelly  |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.7.1
 Keywords:               |       Port:  argyll @2.2.1_1
-------------------------+-----------------------------
 The error below occur while installing argyll @2.2.1_1 on macOS 12.1
 Apple clang version 13.0.0 (clang-1300.0.27.3)
 Target: x86_64-apple-darwin21.2.0
 Thread model: posix

 {{{
 :info:build execunix.c:234:6: error: implicit declaration of function
 'execvp' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
 :info:build             execvp( argv[0], argv );
 :info:build             ^
 :info:build execunix.c:235:6: error: implicitly declaring library function
 '_exit' with type 'void (int) __attribute__((noreturn))' [-Werror
 ,-Wimplicit-function-declaration]
 :info:build             _exit(127);
 :info:build             ^
 :info:build execunix.c:235:6: note: include the header <unistd.h> or
 explicitly provide a declaration for '_exit'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/64420>
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