[MacPorts] #69745: pulseaudio @17.0 -x11: build fails on m4 tool

[MacPorts]

#69745: pulseaudio @17.0 -x11: build fails on m4 tool
--------------------+------------------------
 Reporter:  DrLex0  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.9.3
 Keywords:          |       Port:  pulseaudio
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 Similar to #69467, but its fix does not work for this build.

 The dreaded “The m4 command requires the command line developer tools”
 dialog shows up, and the build aborts. Looks like something (CMake?) still
 wants to use the m4 tool that Apple forgot to provide:

 {{{:info:configure Program m4 found: YES (/usr/bin/m4)}}}

 This is a usable workaround:

 {{{sudo ln -s /Library/Developer/CommandLineTools/usr/bin/gm4
 /Library/Developer/CommandLineTools/usr/bin/m4}}}

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Ticket URL: <https://trac.macports.org/ticket/69745>
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