--- CMakeLists.txt.orig	2017-04-19 13:09:34 UTC
+++ CMakeLists.txt
@@ -38,7 +38,7 @@ if( NOT BUILD_WITH_QT4 )
     find_package(Qt5Core QUIET)
 endif()
 
-if (Qt5Core_FOUND)
+if (NOT BUILD_WITH_QT4)
   set(QTKEYCHAIN_VERSION_INFIX 5)
 
   if(UNIX AND NOT APPLE AND NOT ANDROID)
@@ -249,8 +249,9 @@ ecm_generate_pri_file(BASE_NAME Qt${QTKE
   INCLUDE_INSTALL_DIR ${CMAKE_INSTALL_INCLUDEDIR}
   FILENAME_VAR pri_filename)
 
-install(FILES ${pri_filename} DESTINATION ${ECM_MKSPECS_INSTALL_DIR})
-
+if( NOT BUILD_WITH_QT4 )
+  install(FILES ${pri_filename} DESTINATION ${ECM_MKSPECS_INSTALL_DIR})
+endif()
 
 install(EXPORT Qt${QTKEYCHAIN_VERSION_INFIX}KeychainLibraryDepends
     DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Qt${QTKEYCHAIN_VERSION_INFIX}Keychain"
