[ET Trac] [Einstein Toolkit] #1170: ExtrenalLibraries handle XXX_DIR XXX_INC_DIRS and XXX_LIB_DIRS incosistently

[Einstein Toolkit]

#1170: ExtrenalLibraries handle XXX_DIR XXX_INC_DIRS and XXX_LIB_DIRS
incosistently
-----------------------------------+----------------------------------------
 Reporter:  rhaas                  |       Owner:     
     Type:  defect                 |      Status:  new
 Priority:  minor                  |   Milestone:     
Component:  EinsteinToolkit thorn  |     Version:     
 Keywords:  ExternalLibraries      |  
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 This is a companion ticket to #1006.

 Different thorns (eg. MPI and HDF5 and LAPACK) handle XXX_DIR and
 XXX_INC_DIRS etc differently. MPI for example sets the include path to
 $MPI_DIR/include if MPI_INC_DIRS is not explicitly set and to MPI_INC_DIRS
 if it is set. HDF5 has no HDF5_INC_DIRS option and always sets the include
 path to HDF5_DIR/include. LAPACK has not INC_DIRS option and sets the
 linker path to LAPACK_DIR while the other two thorns set it to XXX_DIR/lib
 (unless overridden by MPI_LIB_DIRS in the case of MPI).

 I would be good to present a uniform set of option for all these thorns.

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Ticket URL: <https://trac.einsteintoolkit.org/ticket/1170>
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