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diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5b3e77..4c5fd3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -313,14 +313,16 @@ else()
endif()
#SHARE - use the default on Apple as TAG_VERSION is empty
-if(WIN32 OR OS2)
- set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/")
-elseif(TAG_VERSION OR BUILD_OSX_BUNDLE)
- set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${MAIN_DIR_NAME}${TAG_VERSION}/")
-elseif(NOT WANT_VERSIONING)
- set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${MAIN_DIR_NAME}/")
-else()
- set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${MAIN_DIR_NAME}-${VERSION}/")
+if(NOT DOCDIR)
+ if(WIN32 OR OS2)
+ set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/")
+ elseif(TAG_VERSION OR BUILD_OSX_BUNDLE)
+ set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${MAIN_DIR_NAME}${TAG_VERSION}/")
+ elseif(NOT WANT_VERSIONING)
+ set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${MAIN_DIR_NAME}/")
+ else()
+ set(DOCDIR "${CMAKE_INSTALL_DATAROOTDIR}/doc/${MAIN_DIR_NAME}-${VERSION}/")
+ endif()
endif()
if(IS_ABSOLUTE ${DOCDIR} AND WANT_RELOCATABLE)
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