--- CMakeLists.txt.orig	2017-12-11 09:39:35 UTC
+++ CMakeLists.txt
@@ -108,6 +108,7 @@ if(QT5_BUILD)
 else()
   find_package(Qt4 REQUIRED)
   find_package(QJSON 0.8.0 REQUIRED)
+  include_directories(${QJSON_INCLUDE_DIR})
   add_definitions("'-DQStringLiteral(str)=QString::fromUtf8(\"\" str \"\", sizeof(str) - 1)'")
 
   if(WIN32)