doc: mention that macOS system headers now require manual installation #14352

1. 
   fanquake commented at 10:25 am on September 29, 2018: member

   Starting with Xcode 10.0, installing the macOS Command Line Tools no longer installs the macOS system headers into /usr/include/ (this behaviour is seemingly deprecated).

   This means that building some dependencies using depends will fail like:

   0fatal error: 'unistd.h' file not found
   

   /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg is provided as a work around to install the system headers into /usr/include/. This has come up once already, so probably worth documenting in the macOS build notes.

2. fanquake added the label Docs on Sep 29, 2018
3. fanquake added the label macOS on Sep 29, 2018
4. fanquake requested review from theuni on Sep 29, 2018
5. doc: mention that macOS system headers now require manual installation 9860689829
6. fanquake force-pushed on Sep 29, 2018
7. DocOBITCOIN approved
8. 
   promag commented at 7:06 pm on October 1, 2018: member

   I guess this not necessary for those that update from a working development environment?
9. 
   theuni commented at 8:44 pm on October 1, 2018: member

   I don’t think this is the right thing to do. Instead, we should be making sure that the SDK is used as the sysroot as intended.
10. 
    fanquake commented at 5:18 am on October 9, 2018: member

    @theuni I’ll close this for now. Anyone that runs into the problem can find this PR, or the discussion in other issues.
11. fanquake closed this on Oct 9, 2018

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12. fanquake deleted the branch on Oct 9, 2018
13. 
    Sjors commented at 2:08 pm on October 12, 2019: member

    Trying the proper (?) solution in #17118
14. laanwj referenced this in commit 4cfb6738e8 on Oct 16, 2019
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fanquake DocOBITCOIN promag theuni Sjors

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