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FindPETSc.cmake
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			# - Try to find PETSc
			# PETSC_FOUND - system has PETSc
			# PETSC_INCLUDE_DIRS - the PETSc include directories
			# PETSC_LIBRARIES - Link these to use PETSc
			# PETSC_VERSION - Version string (MAJOR.MINOR.SUBMINOR)

			if(PETSc_FIND_REQUIRED)
			find_package(PkgConfig REQUIRED)
			else()
			find_package(PkgConfig QUIET)
			if(NOT PKG_CONFIG_FOUND)
			return()
			endif()
			endif()

			pkg_search_module(_petsc PETSc)

			# Some debug code
			#get_property(_vars DIRECTORY PROPERTY VARIABLES)
			#foreach(_var ${_vars})
			# if ("${_var}" MATCHES "^_petsc")
			# message("${_var} -> ${${_var}}")
			# endif()
			#endforeach()

			if(_petsc_FOUND AND _petsc_VERSION)
			set(PETSC_VERSION ${_petsc_VERSION})
			endif()

			if(_petsc_FOUND AND (NOT PETSC_LIBRARIES))
			set(_petsc_libs)
			foreach(_lib ${_petsc_LIBRARIES})
			string(TOUPPER "${_lib}" _u_lib)
			find_library(PETSC_LIBRARY_${_u_lib} ${_lib} PATHS ${_petsc_LIBRARY_DIRS})
			list(APPEND _petsc_libs ${PETSC_LIBRARY_${_u_lib}})
			mark_as_advanced(PETSC_LIBRARY_${_u_lib})
			endforeach()

			set(PETSC_LIBRARIES ${_petsc_libs} CACHE INTERNAL "")
			set(PETSC_INCLUDE_DIRS ${_petsc_INCLUDE_DIRS} CACHE INTERNAL "")
			if(NOT TARGET petsc::petsc)
			add_library(petsc::petsc INTERFACE IMPORTED)
			set_property(TARGET petsc::petsc PROPERTY INTERFACE_LINK_LIBRARIES ${PETSC_LIBRARIES})
			set_property(TARGET petsc::petsc PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${PETSC_INCLUDE_DIRS})
			endif()
			endif()

			include (FindPackageHandleStandardArgs)
			find_package_handle_standard_args(PETSc
			REQUIRED_VARS PETSC_LIBRARIES PETSC_INCLUDE_DIRS
			VERSION_VAR PETSC_VERSION)