diff -up doxygen-1.8.10/doc/CMakeLists.txt.than doxygen-1.8.10/doc/CMakeLists.txt

--- doxygen-1.8.10/doc/CMakeLists.txt.than	2015-08-28 11:46:15.675460840 +0200

+++ doxygen-1.8.10/doc/CMakeLists.txt	2015-08-28 11:51:27.894592457 +0200

@@ -88,17 +88,17 @@ install(FILES

         "${PROJECT_BINARY_DIR}/man/doxywizard.1"

         "${PROJECT_BINARY_DIR}/man/doxysearch.1"

         "${PROJECT_BINARY_DIR}/man/doxyindexer.1"

-        DESTINATION man/man1

+        DESTINATION "${MAN_INSTALL_DIR}"

 )

 install(FILES

         "${PROJECT_BINARY_DIR}/latex/doxygen_manual.pdf"

-        DESTINATION "${CMAKE_INSTALL_PREFIX}/${DOC_INSTALL_DIR}"

+        DESTINATION "${DOC_INSTALL_DIR}"

 )

 install(DIRECTORY

         "${PROJECT_BINARY_DIR}/html"

-        DESTINATION "${CMAKE_INSTALL_PREFIX}/${DOC_INSTALL_DIR}"

+        DESTINATION "${DOC_INSTALL_DIR}"

 )

 endif()