Xcodebuild Fails on Tunnelblick, Apparently Caused by Missing -I Flag

[Steven Smith]

I’m trying to build Tunnelblick in MacPorts.

The xcodebuild command is failing to find a header file, Sparkle/SUUpdater.h, but this file is created by the build process. The logs show that the necessary flag -I is not being passed to clang , i.e., -I/path/to/the/right/header/dir. This comment has the full command from the logs: https://github.com/Tunnelblick/Tunnelblick/issues/592#issue-541983427

I believe that the issue is upstream in Tunnelblick’s Xcode project. However, I’m not certain, and neither I nor the upstream author @jkbullard have diagnosed the issue.

If any Xcode experts have some cycles to take a look, it would be nice to have a MacPorts-managed Tunnelblick built using recent Xcode and macOS versions.

See:

https://github.com/macports/macports-ports/pull/6051
https://github.com/Tunnelblick/Tunnelblick/issues/592
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