QT for some reason messes with XCompose causing broken input (Qt 5 only - Qt 4 did not break anything). In Qt 5.2 and 5.3 this was causing an invalid conversion in chat messages containing these resulting in the bad bytes being stripped. In Qt 5.9 it is still broken, but you at least get a string with something in it. This checks for non-zero converted strings for room creation and chat lines.
# check for a well known-framework
execute_process(COMMAND stat ${frameworks_dir}/QtCore.framework RESULT_VARIABLE doBundle OUTPUT_QUIET ERROR_QUIET)
# prepare Frameworks directory
execute_process(COMMAND mkdir -p ${frameworks_dir})
# macdeployqt will convert safely any absolute path library for 'hedgewars'
execute_process(COMMAND ${macdeployqt_executable} ${CMAKE_BINARY_DIR}/Hedgewars.app OUTPUT_QUIET ERROR_QUIET)
# but macdeployqt will not work for a second executable, so employ this series of ridiculous commands to work around it
execute_process(COMMAND mv ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/hedgewars ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/tmp)
execute_process(COMMAND mv ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/hwengine ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/hedgewars)
execute_process(COMMAND ${macdeployqt_executable} ${CMAKE_BINARY_DIR}/Hedgewars.app OUTPUT_QUIET ERROR_QUIET)
execute_process(COMMAND mv ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/hedgewars ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/hwengine)
execute_process(COMMAND mv ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/tmp ${CMAKE_BINARY_DIR}/Hedgewars.app/Contents/MacOS/hedgewars)
if(doBundle EQUAL 1)
if(${SPARKLE_FOUND})
execute_process(COMMAND cp -pPR ${SPARKLE_LIBRARY} ${frameworks_dir})
endif()
message(STATUS "Frameworks and libraries successfully copied...")
else()
message(STATUS "Frameworks already present, skipping...")
endif()