patch parmetis to use external GKlib

var/spack/repos/builtin/packages/parmetis/enable_external_metis.patch

@@ -1,13 +1,55 @@
 diff --git a/CMakeLists.txt b/CMakeLists.txt
-index ca945dd..1bf94e9 100644
+index ca945dd..5995e42 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
+@@ -23,7 +23,7 @@ else()
+   set(ParMETIS_LIBRARY_TYPE STATIC)
+ endif()
+ 
+-include(${GKLIB_PATH}/GKlibSystem.cmake)
++include_directories(${GKLIB_PATH})
+ 
+ # List of paths that the compiler will search for header files.
+ # i.e., the -I equivalent
 @@ -33,7 +33,7 @@ include_directories(${GKLIB_PATH})
  include_directories(${METIS_PATH}/include)
  
  # List of directories that cmake will look for CMakeLists.txt
 -add_subdirectory(${METIS_PATH}/libmetis ${CMAKE_BINARY_DIR}/libmetis)
-+#add_subdirectory(${METIS_PATH}/libmetis ${CMAKE_BINARY_DIR}/libmetis)
++# add_subdirectory(${METIS_PATH}/libmetis ${CMAKE_BINARY_DIR}/libmetis)
  add_subdirectory(include)
  add_subdirectory(libparmetis)
  add_subdirectory(programs)
+diff --git a/libparmetis/parmetislib.h b/libparmetis/parmetislib.h
+index c1daeeb..07511f6 100644
+--- a/libparmetis/parmetislib.h
++++ b/libparmetis/parmetislib.h
+@@ -20,13 +20,12 @@
+ 
+ #include <parmetis.h>
+ 
+-#include "../metis/libmetis/gklib_defs.h"
++#include <gklib_defs.h>
+ 
+-#include <mpi.h> 
++#include <mpi.h>
+ 
+ #include <rename.h>
+ #include <defs.h>
+ #include <struct.h>
+ #include <macros.h>
+ #include <proto.h>
+-
+diff --git a/programs/parmetisbin.h b/programs/parmetisbin.h
+index e26cd2d..d156480 100644
+--- a/programs/parmetisbin.h
++++ b/programs/parmetisbin.h
+@@ -19,7 +19,7 @@
+ #include <GKlib.h>
+ #include <parmetis.h>
+ 
+-#include "../metis/libmetis/gklib_defs.h"
++#include <gklib_defs.h>
+ #include "../libparmetis/rename.h"
+ #include "../libparmetis/defs.h"
+ #include "../libparmetis/struct.h"

var/spack/repos/builtin/packages/parmetis/package.py

@@ -66,7 +66,7 @@ def install(self, spec, prefix):
 
         # FIXME : Once a contract is defined, MPI compilers should be retrieved indirectly via spec['mpi'] in case
         # FIXME : they use a non-standard name
-        options.extend(['-DGKLIB_PATH:PATH={metis_source}/GKlib'.format(metis_source=metis_source), # still need headers from METIS source, and they are not installed with METIS. shame...
+        options.extend(['-DGKLIB_PATH:PATH={metis_source}/GKlib'.format(metis_source=spec['metis'].prefix.include),
                         '-DMETIS_PATH:PATH={metis_source}'.format(metis_source=spec['metis'].prefix),
                         '-DCMAKE_C_COMPILER:STRING=mpicc',
                         '-DCMAKE_CXX_COMPILER:STRING=mpicxx'])