--- a/addon/doxysearch/CMakeLists.txt	2019-04-03 18:43:47.995610511 +0200
+++ b/addon/doxysearch/CMakeLists.txt	2019-04-03 18:45:27.730609191 +0200
@@ -18,6 +18,7 @@
                       ${ZLIB_LIBRARIES}
 		      ${WIN_EXTRA_LIBS}
                       qtools
+                      pthread
 )
 
 add_executable(doxysearch.cgi
@@ -27,6 +28,7 @@
                       ${XAPIAN_LIBRARIES}
                       ${ZLIB_LIBRARIES}
 		      ${WIN_EXTRA_LIBS}
+		      pthread
 )
 
 install(TARGETS doxyindexer doxysearch.cgi DESTINATION bin)
--- a/addon/doxywizard/CMakeLists.txt	2019-04-03 18:43:59.139610364 +0200
+++ b/addon/doxywizard/CMakeLists.txt	2019-04-03 18:45:14.151609371 +0200
@@ -102,9 +102,9 @@
 )
 
 if(Qt5Core_FOUND)
-  target_link_libraries(doxywizard Qt5::Core Qt5::Gui Qt5::Widgets Qt5::Xml)
+  target_link_libraries(doxywizard Qt5::Core Qt5::Gui Qt5::Widgets Qt5::Xml pthread)
 else()
-  target_link_libraries(doxywizard ${QT_LIBRARIES} ${QT_QTMAIN_LIBRARY})
+  target_link_libraries(doxywizard ${QT_LIBRARIES} ${QT_QTMAIN_LIBRARY} pthread)
 endif()
 
 install(TARGETS doxywizard DESTINATION bin)