mercurial fails to build when

[Ryan Schmidt]

On Sep 12, 2017, at 19:36, Glenn Ramsey wrote:
> 
> On OSX 10.12.6 with the latest Xcode I have set macosx_deployment_target to 10.8
> in macports.conf and when installing mercurial I get this error:
> 
> error: $MACOSX_DEPLOYMENT_TARGET mismatch: now "10.8" but "10.12" during configure
> 
> Is this a bug or can I only install mercurial if macosx_deployment_target
> matches the SDK version? If it is a bug, what is the workaround?

I would guess there are a fair number of ports that fail to build when macosx_deployment_target is changed, or that build successfully but ignore the requested macosx_deployment_target, because this is an esoteric feature that few people test. Looks like mercurial is one of those ports. 

Sure, it can be considered a bug in that port; you could file a bug report in our issue tracker. Each port's build system is different so I can't give you a one-size-fits-all solution. In some cases, the reason may be that the port's build system specifies its own value for that environment variable (or the equivalent compiler flag). If so, the solution might be to remove that code from the build system.