Index: cmake/modules/AddSphinxTarget.cmake
===================================================================
--- cmake/modules/AddSphinxTarget.cmake
+++ cmake/modules/AddSphinxTarget.cmake
@@ -51,7 +51,7 @@
         # FIXME: We might not ship all the tools that these man pages describe
         install(DIRECTORY "${SPHINX_BUILD_DIR}/" # Slash indicates contents of
                 COMPONENT "${project}-sphinx-man"
-                DESTINATION share/man/man1)
+                DESTINATION ${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_MANDIR}/man1)
 
       elseif (builder STREQUAL html)
         string(TOUPPER "${project}" project_upper)