[MacPorts] #68389: R: libR.pc bakes in destroot path into include flags

[MacPorts]

#68389: R: libR.pc bakes in destroot path into include flags
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 Reporter:  barracuda156  |      Owner:  i0ntempest
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  R
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 I believe, this is wrong? I.e. it may be correct during a build of `R`
 itself, but will point to nowhere otherwise.

 {{{
 rhome=/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_R/R/work/destroot/opt/local/Library/Frameworks/R.framework/Versions/4.3/Resources
 rlibdir=${rhome}/lib
 rincludedir=/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_math_R/R/work/destroot/opt/local/Library/Frameworks/R.framework/Versions/4.3/Resources/include
 }}}

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Ticket URL: <https://trac.macports.org/ticket/68389>
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