[screen-devel] [bug #59465] GNU Screen fails to build on macOS with Xcode 12

[Issy]

URL:
  <https://savannah.gnu.org/bugs/?59465>

                 Summary: GNU Screen fails to build on macOS with Xcode 12
                 Project: GNU Screen
            Submitted by: issyl0
            Submitted on: Sat 14 Nov 2020 11:58:42 PM UTC
                Category: Build/Install
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
                 Release: 4.8.0
         Discussion Lock: Any
           Fixed Release: None
         Planned Release: None
           Work Required: None

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Details:

Hi,

I'm a maintainer of Homebrew (a macOS package manager) and we're trying to
build packages on the newly released macOS 11.0 and its counterpart Xcode 12
release. GNU Screen v4.8.0 fails to build:

```
configure: checking select with  -lnet -lnsl...
configure: error: !!! no select - no screen
```

and later

```
configure: error: !!! no tgetent - no screen
```

Upon investigation, it seems like it fails because Clang 12 requires functions
to be defined before use.

There exist some patches elsewhere that fix this by `include`ing the right
headers, for example, this set from MacPorts:
https://github.com/macports/macports-ports/commit/38df2ef467d4bcce657e8b8d36735c1fc9bb64eb.

Thanks,

Issy.




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