[MacPorts] #68340: go @1.17.13_0: environment variables for olders macOS versions cause bash to print "wrong substitution" and thus compiles fail.

[MacPorts]

#68340: go @1.17.13_0: environment variables for olders macOS versions cause bash
to print "wrong substitution" and thus compiles fail.
------------------------+--------------------
  Reporter:  garoffoli  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  go         |
------------------------+--------------------

Comment (by RobK88):

 @garoffoli -  Here is an example of setting these environment variables in
 a Portfile for a `go` program.  One would include this code block in the
 Portfile:



 {{{
 pre-build {
 #       Sierra and earlier
         if { ${os.platform} eq "darwin" && ${os.major} < 17 } {
                 build.args-append   GO_EXTLINK_ENABLED="1" \
 GO_LDFLAGS="\"-extldflags=${configure.ldflags}\"" \
                                     CGO_LDFLAGS="-g -O2
 ${configure.ldflags}"
 }
 }}}

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Ticket URL: <https://trac.macports.org/ticket/68340#comment:5>
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