--- a/CMakeLists.txt	2018-02-07 11:57:43.000000000 +0100
+++ b/CMakeLists.txt	2018-04-04 22:12:33.000000000 +0200
@@ -200,8 +200,7 @@
 	set(Communi_DIR "${CMAKE_SOURCE_DIR}/cmake_modules")
 	find_package(Communi)
 
-	INCLUDE(FindQt4)
-	FIND_PACKAGE(Qt4 COMPONENTS QtCore QtNetwork)
+	FIND_PACKAGE(Qt5 COMPONENTS Core Network)
 	# ADD_DEFINITIONS(${SWIFTEN_CFLAGS})
 	ADD_DEFINITIONS(-DSUPPORT_LEGACY_CAPS)
 	# ADD_DEFINITIONS(-DBOOST_FILESYSTEM_VERSION=2)
@@ -341,7 +340,6 @@
 		message("IRC plugin        : yes")
 		include_directories(${QT_QTNETWORK_INCLUDE_DIR})
 		include_directories(${IRC_INCLUDE_DIR})
-		include(${QT_USE_FILE})
 	else()
 		if(ENABLE_IRC)
 			message("IRC plugin        : no (install libCommuni and libprotobuf-dev)")
--- a/backends/libcommuni/CMakeLists.txt	2018-02-07 11:57:43.000000000 +0100
+++ b/backends/libcommuni/CMakeLists.txt	2018-04-04 22:20:11.000000000 +0200
@@ -1,14 +1,15 @@
 cmake_minimum_required(VERSION 2.6)
+find_package(Qt5Network REQUIRED)
 FILE(GLOB SRC *.cpp)
 FILE(GLOB HEADERS *.h)
-QT4_WRAP_CPP(SRC ${HEADERS} OPTIONS -DBOOST_TT_HAS_OPERATOR_HPP_INCLUDED)
-add_definitions(-DQT_NO_KEYWORDS)
+QT5_WRAP_CPP(SRC ${HEADERS} OPTIONS -DBOOST_TT_HAS_OPERATOR_HPP_INCLUDED)
 ADD_EXECUTABLE(spectrum2_libcommuni_backend ${SRC})
+include_directories(${Qt5Core_INCLUDE_DIRS} ${Qt5Network_INCLUDE_DIRS})
 
 if (NOT WIN32)
-	target_link_libraries(spectrum2_libcommuni_backend ${IRC_LIBRARY} Qt4::QtNetwork Qt4::QtCore transport pthread)
+	target_link_libraries(spectrum2_libcommuni_backend ${IRC_LIBRARY} Qt5::Network Qt5::Core transport pthread)
 else ()
-	target_link_libraries(spectrum2_libcommuni_backend ${IRC_LIBRARY} Qt4::QtNetwork Qt4::QtCore transport)
+	target_link_libraries(spectrum2_libcommuni_backend ${IRC_LIBRARY} Qt5::Network Qt5::Core transport)
 endif()
 INSTALL(TARGETS spectrum2_libcommuni_backend RUNTIME DESTINATION bin)
 
--- a/cmake_modules/FindCommuni.cmake	2018-02-07 11:57:43.000000000 +0100
+++ b/cmake_modules/FindCommuni.cmake	2018-04-04 22:14:07.000000000 +0200
@@ -1,8 +1,7 @@
-find_package(Qt4)
-include( ${QT_USE_FILE} )
+find_package(Qt5Network)
 
 FIND_LIBRARY(IRC_LIBRARY NAMES IrcCore PATHS ${QT_LIBRARY_DIR})
-FIND_PATH(IRC_INCLUDE_DIR NAMES "IrcCore/ircglobal.h" PATHS ${QT_INCLUDE_DIR} PATH_SUFFIXES Communi)
+FIND_PATH(IRC_INCLUDE_DIR NAMES "IrcCore/ircglobal.h" PATHS ${Qt5Core_INCLUDE_DIRS} ${Qt5Core_INCLUDE_DIRS}"/.." PATH_SUFFIXES Communi)
 
 # message( STATUS ${IRC_LIBRARY})
 if( IRC_LIBRARY AND IRC_INCLUDE_DIR )