[MacPorts] #67314: R: do we need sysroot to be detected on systems without xcrun?

[MacPorts]

#67314: R: do we need sysroot to be detected on systems without xcrun?
-----------------------------------------+----------------------
 Reporter:  barracuda156                 |      Owner:  kjellpk
     Type:  defect                       |     Status:  assigned
 Priority:  Normal                       |  Milestone:
Component:  ports                        |    Version:  2.8.1
 Keywords:  tiger, leopard, snowleopard  |       Port:  R
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 When installing R packages that require compilation, I am getting this
 with R 4.3.0:
 {{{
 ** libs
 using C compiler: ‘gcc-mp-12 (MacPorts gcc12 12.2.0_2) 12.2.0’
 using C++ compiler: ‘g++-mp-12 (MacPorts gcc12 12.2.0_2) 12.2.0’
 Warning in system2("xcrun", "--show-sdk-path", TRUE, TRUE) :
   running command ''xcrun' --show-sdk-path 2>&1' had status 64
 using SDK: ‘NA’‘NA’‘NA’‘NA’‘NA’‘NA’
 }}}
 And then sysroot is not passed. However, build succeeds and tests pass, so
 I am not sure if this is in need of fixing or not.
 Thoughts?

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Ticket URL: <https://trac.macports.org/ticket/67314>
MacPorts <https://www.macports.org/>
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