Pick up SDKROOT as the sysroot fallback.

[Chris Jones]

Hi,

Interesting thanks . Was wondering about something like this. Let me see about porting it to the gcc9 build.

Chris

> On 13 Oct 2019, at 3:24 pm, Jack Howarth <howarth.at.macports at gmail.com> wrote:
> 
> 
>    We might want to back port this patch into out gcc9 package in order to avoid hard coding the SDKROOT path in the compiler during the build.
> 
> [Darwin, committed] Pick up SDKROOT as the sysroot fallback.
> 
>      Jack
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