[MacPorts] #33044: port can't find R dylibs and repeatedly rebuilds

[MacPorts]

#33044: port can't find R dylibs and repeatedly rebuilds
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 Reporter:  stephen@…           |       Owner:  macports-tickets@…                   
     Type:  defect              |      Status:  new                                  
 Priority:  Normal              |   Milestone:                                       
Component:  ports               |     Version:  2.0.3                                
 Keywords:  rev-upgrade         |        Port:  R                                    
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Comment(by cal@…):

 The problem is not about not being able to execute R through
 `${prefix}/bin/R`, which sets `DYLD_LIBRARY_PATH` to the appropriate paths
 so the R binary will find it's libraries, but about our new check routine
 `rev-upgrade` in trunk, which tries to find binaries that have broken
 linkage. Since we cannot automatically determine whether
 `DYLD_LIBRARY_PATH` is set before starting a binary (we can't *know*
 automatically that R is supposed to be run through the script setting
 `DYLD_LIBRARY_PATH`) it thinks `${prefix}/lib/R/bin/exec/x86_64/R` is
 broken, since it references a non-existant file and marks it for rebuild,
 which *usually* fixes this kind of problems, however in this case does
 not, because it's by design.

 The problem can be easily fixed by running the two lines I posted above in
 a post-destroot phase, though, and this is why I think we should add this.

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Ticket URL: <https://trac.macports.org/ticket/33044#comment:4>
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