[MacPorts] #63748: xsel 1.2.0 fails to build on macOS 12.0.1

[MacPorts]

#63748: xsel 1.2.0 fails to build on macOS 12.0.1
---------------------------+------------------------
  Reporter:  derekschrock  |      Owner:  ryandesign
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  monterey
      Port:  xsel          |
---------------------------+------------------------

Comment (by derekschrock):

 xsel's [https://github.com/kfish/xsel/blob/master/configure.ac
 configure.ac] has
 [https://www.gnu.org/software/autoconf/manual/autoconf-2.60/html_node
 /Particular-Functions.html AC_FUNC_FORK] which creates the macro:

 `#define vfork fork`

 This is added to `"config.h"` included in
 [https://github.com/kfish/xsel/blob/master/xsel.c#L13 xsel.c] before
 [https://github.com/kfish/xsel/blob/master/xsel.c#L18 system headers].

 macOS 12's
 [https://gist.githubusercontent.com/derekschrock/9acb738e0d9a21e977f281be2dc819c5/raw/7a5fad9d5bc75024c7581638e19d21339d6e0c40/gistfile1.h
 <unistd.h>] has the following:

 {{{
 ...

 #if !defined(_POSIX_C_SOURCE)
 __deprecated_msg("Use posix_spawn or fork")
 #endif
 pid_t    vfork(void) __WATCHOS_PROHIBITED __TVOS_PROHIBITED;
 /* End XSI */
 ...
 }}}

 Since `"config.h"` with the above macro `#define vfork fork` that `pid_t
 vfork ...` turns in to `pid_t fork ...` So now any usage of `fork()`
 results in a depercation message.

 The exact fix is still in question as mentioned
 [https://github.com/kfish/xsel/issues/42#issuecomment-961575330 here].
 Any one of those can be used.  However, the easy ones would be to remove
 ​AC_FUNC_FORK from configure.ac or remove or `#undef vfork` the vfork
 macro after `autoconf` runs.

 Assuming everything I said is true/correct. Removing `AC_FUNC_FORK` from
 `configure.ac` might be the easiest/safest?  From my understanding
 `AC_FUNC_FORK` is only here for broken vfork/fork which isn't an issue on
 supported macOS version?
 `

-- 
Ticket URL: <https://trac.macports.org/ticket/63748#comment:6>
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