[MacPorts] #57157: root6 with +veccore variant has include path problems

[MacPorts]

#57157: root6 with +veccore variant has include path problems
---------------------------+----------------------
 Reporter:  olupton        |      Owner:  (none)
     Type:  defect         |     Status:  assigned
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.5.3
 Keywords:  root6 veccore  |       Port:  root6
---------------------------+----------------------
 I have the following variant of the root6 port
 {{{@6.14.04_0+clang60+cocoa+cxx17+gcc8+gsl+http+minuit2+opengl+python37+roofit+root7+soversion+ssl+tmva+vc+veccore+xml+xrootd}}}

 Code that links against this now fails to compile with errors such as:
 {{{
 In file included from
 /opt/local/libexec/root6/include/root/Math/Minimizer.h:20:
 In file included from
 /opt/local/libexec/root6/include/root/Math/Util.h:27:
 /opt/local/libexec/root6/include/root/Math/Types.h:22:10: fatal error:
 'VecCore/VecCore' file not found
 #include <VecCore/VecCore>
          ^~~~~~~~~~~~~~~~~
 1 error generated.
 }}}

 The problem seems to be that the VecCore headers are installed at a higher
 level in the directory structure than the other ROOT headers:
 {{{
 $ ls /opt/local/libexec/root6/include/
 VecCore root
 }}}

 So even if the correct ROOT include directory
 {{{
 $ root-config --incdir
 /opt/local/libexec/root6/include/root
 }}}
 is in the include path, the VecCore headers that ROOT's own headers
 request cannot be found.

 As a minimal workaround, making
 {{{/opt/local/libexec/root6/include/root/VecCore}}} be a symlink to
 {{{/opt/local/libexec/root6/include/VecCore}}} seems to fix the
 compilation errors.

-- 
Ticket URL: <https://trac.macports.org/ticket/57157>
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