[MacPorts] #64913: vlang fails for PowerPC: -latomic flag needed, Header file <sys/errno.h>, needed for module `sync` was not found

[MacPorts]

#64913: vlang fails for PowerPC: -latomic flag needed, Header file <sys/errno.h>,
needed for module `sync` was not found
---------------------------+-------------------------------------------
  Reporter:  barracuda156  |      Owner:  harens
      Type:  defect        |     Status:  accepted
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:  powerpc, leopard, snowleopard
      Port:  vlang         |
---------------------------+-------------------------------------------

Comment (by harens):

 > Thank you. Just for the record, on 10.6 PPC it fails still with:

 If this is different to the `sys/errno.h` error, would you mind sending
 the logs? Thanks.

 > It also ignores +universal and builds only one arch.

 Thank you for letting me know. This might be quite difficult to fix, since
 vlang has an unusual build setup, but I'll see what I can do. Worst case
 scenario, I might disable the universal variant, but hopefully it won't
 come to that.

 > Attempt to build for ppc32 also fails on Leopard in the same way

 I still don't understand why it can't find the header automatically.
 However, we can try manually including it and see if that works.

 Would you mind adding `-cflags -I${configure.sdkroot}/usr/include` to the
 end of `VFLAGS` in the portfile. i.e.

 {{{
 VFLAGS="-v -cg -showcc -prod -cc ${configure.cc} -cflags [shellescape
 ${configure.cflags}] -cflags -I${configure.sdkroot}/usr/include" \
 }}}

 I'm not entirely sure what `${configure.sdkroot}` is on your machine, so
 if that doesn't work, try `-cflags -I/usr/include`. Lets see if that
 changes anything.

-- 
Ticket URL: <https://trac.macports.org/ticket/64913#comment:11>
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