[MacPorts] #65510: Can no longer compile R packages with MacPorts's GCC (@rpath related)

[MacPorts]

#65510: Can no longer compile R packages with MacPorts's GCC (@rpath related)
----------------------+--------------------------
 Reporter:  szhorvat  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  gcc11, gcc12
----------------------+--------------------------
 Since recently, I can no longer use MacPort's GCC/gfortran to compile R
 packages. The packages will not load. The error is:


 {{{
 Library not loaded: @rpath/libgfortran.5.dylib
 ...
 Reason: image not found
 }}}

 If I look at what the shared library that was compiled references with
 `otool -L`, I see this:

 {{{
 ...
 /opt/local/lib/libgmp.10.dylib (compatibility version 15.0.0, current
 version 15.1.0)
 /opt/local/lib/libglpk.40.dylib (compatibility version 44.0.0, current
 version 44.1.0)
 ...
 @rpath/libgfortran.5.dylib (compatibility version 6.0.0, current version
 6.0.0)
 @rpath/libquadmath.0.dylib (compatibility version 1.0.0, current version
 1.0.0)
 }}}

 As I recall, in the past, `libgfortran` and `libquadmath` used to be
 referenced with full path. Now they are referenced with @rpath. I do not
 know how shared libraries are looked up on macOS, or what @rpath means,
 but I assume this is the source of the problem.

 This makes it impossible to use MacPort's GCC to compile R packages, which
 is a serious problem for me.

 Is there a workaround?

-- 
Ticket URL: <https://trac.macports.org/ticket/65510>
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