nettle @3.9.1_0: won't build on macOS 14 / XCode 15.3

[rbeyer (Ross Beyer)]

When I try and build nettle on my M3 macOS 15 system under XCode 15.3, it yields this error:

:info:build xcode-select: Failed to locate 'm4', requesting installation of command line developer tools.

A dialog is opened asking if I want to install. However, after doing that, and then attempting to rebuild the port, the same exact error happens. So I'm not entirely sure what's wrong. Earlier in the build log (attached), there are messages saying that m4 is in the build tree and is found, but then later when clang runs, I guess it is trying to look for it in the command line developer tools, and I'm not sure why it can't be found?

[rbeyer (Ross Beyer)]

main.log from port install -v nettle

[ryandesign (Ryan Carsten Schmidt)]

The repeated request to install the command line tools, and the failure of m4 to work even after doing so, is a bug in version 15.3 of the command line tools. Apple forgot to include m4 in it. It is filed with Apple as bug number FB13684598. They have not responded to it.

We are working around it in every port that uses m4 as we discover them by using MacPorts m4 instead.

[ryandesign (Ryan Carsten Schmidt)]

In 28ba43a577425db0d6e7b211005ae27081fd7c8d/macports-ports (master):

nettle: Use MacPorts m4

Closes: #69789