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CMakeLists.txt
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			# Doxygen documentation
			# ======================

			# add a target to generate API documentation with Doxygen
			find_package(Doxygen)

			if(DOXYGEN_FOUND)
			# these variables are used in the configuration of the Doxyfile.in
			set (SPECMICP_SRC_DIR ${PROJECT_SOURCE_DIR}/src)
			set (SPECMICP_DOC_DIR ${CMAKE_CURRENT_SOURCE_DIR})

			set (DOC_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})

			# Configure doxygen
			configure_file(Doxyfile.in ${DOC_BINARY_DIR}/Doxyfile @ONLY)
			# Citations for the documentations
			add_custom_target(citations SOURCES citations.bib)
			file(INSTALL citations.bib
			DESTINATION ${DOC_BINARY_DIR})
			# Target to build the documentations
			add_custom_target(doc_html
			${DOXYGEN_EXECUTABLE} ${DOC_BINARY_DIR}/Doxyfile
			WORKING_DIRECTORY ${DOC_BINARY_DIR}
			COMMENT "Generating API documentation with Doxygen" VERBATIM
			)
			install(DIRECTORY ${DOC_BINARY_DIR}/html
			DESTINATION ${SHARE_INSTALL_DIR}
			OPTIONAL
			)
			else()
			message(STATUS "Doxygen is not found, the documentation cannot be build")
			endif(DOXYGEN_FOUND)