Add scotch dependency

src/CMakeLists.txt

@@ -145,6 +145,11 @@ if (SPM_WITH_MPI)
   target_link_libraries(spm PUBLIC MPI::MPI_C)
 endif (SPM_WITH_MPI)
 
+# spm may depend on Scotch if compiled within PaStiX
+if (PASTIX_ORDERING_SCOTCH)
+  target_link_libraries(spm PUBLIC MORSE::SCOTCH)
+endif()
+
 # install the library
 install(TARGETS spm
   ARCHIVE DESTINATION ${LIB_INSTALL_DIR}