[MacPorts] #69639: netcdf fails to build on Sonoma macOS 14.4.1

[MacPorts]

#69639: netcdf fails to build on Sonoma macOS 14.4.1
------------------------+--------------------
 Reporter:  EJFielding  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.9.1
 Keywords:  netcdf m4   |       Port:  netcdf
------------------------+--------------------
 I was trying to do the usual `upgrade outdated` and it was going to
 install a new version of netcdf `netcdf-4.9.2_2`. I also tried installing
 it directly with `sudo port install netcdf +cdf5 +dap +netcdf4 +gcc12`.
 The build failed when it could not find the "m4" program and then it
 requested that I install the command-line tools. I let it run the command-
 line tools installation, cleaned the port, and tried again, but I got the
 same error.

 {{{
 :info:build /Library/Developer/CommandLineTools/usr/bin/make  -f
 libdap4/CMakeFiles/dap4.dir/build.make libdap4/CMakeFiles/dap4.dir/build
 :info:build xcode-select: Failed to locate 'm4', requesting installation
 of command line developer tools.

 }}}

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Ticket URL: <https://trac.macports.org/ticket/69639>
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