diff --git a/CMakeLists.txt b/CMakeLists.txt
index b2e5961..563a642 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,16 +12,12 @@ set(CRONTAB_V "${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}")
 set(QT_MIN_VERSION "5.2.0")
 find_package (Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS
     Core
+    Gui
     Widgets
     Test
 )
 set(CMAKE_AUTOMOC ON)
 
-include_directories(
-    ${Qt5Core_INCLUDE_DIRS}
-    ${Qt5Widgets_INCLUDE_DIRS}
-)
-
 add_subdirectory(crontablib)
 add_subdirectory(src)
 
diff --git a/crontablib/CMakeLists.txt b/crontablib/CMakeLists.txt
index b5fd710..42eaf46 100644
--- a/crontablib/CMakeLists.txt
+++ b/crontablib/CMakeLists.txt
@@ -1,7 +1,3 @@
-include_directories(
-    ${CMAKE_CURRENT_BINARY_DIR}
-)
-
 set(crontablib_SRCS
    cthost.cpp
    ctcron.cpp
@@ -40,7 +36,10 @@ set(crontablib_HDRS
 
 add_library(crontab SHARED ${crontablib_SRCS})
 
-target_link_libraries(crontab Qt5::Core)
+target_link_libraries(crontab Qt5::Core Qt5::Gui)
+target_include_directories(crontab PRIVATE ${Qt5Core_INCLUDE_DIRS}
+                                           ${Qt5Gui_INCLUDE_DIRS}
+                                           ${CMAKE_CURRENT_BINARY_DIR})
 target_compile_features(crontab PRIVATE cxx_lambdas cxx_nullptr cxx_unicode_literals)
 set_target_properties(crontab PROPERTIES VERSION ${CRONTAB_V} SOVERSION ${VERSION_MAJOR})
 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d250979..96b2c1e 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,11 +1,6 @@
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.in
                ${CMAKE_CURRENT_BINARY_DIR}/config.h)
 
-include_directories(
-    ${CMAKE_CURRENT_SOURCE_DIR}/../crontablib
-    ${CMAKE_CURRENT_BINARY_DIR}
-)
-
 set(zeit_SRCS
     aboutdialog.cpp
     alarmdialog.cpp
@@ -36,12 +31,16 @@ SET(TRANSLATION
 find_package(Qt5LinguistTools REQUIRED)
 qt5_add_translation(QM_FILES ${TRANSLATION})
 
-set(qt_LIBS Qt5::Core Qt5::Widgets)
+set(qt_LIBS Qt5::Core Qt5::Gui Qt5::Widgets)
 
 qt5_wrap_ui(zeit_FORMS_HEADERS ${zeit_FRMS})
 qt5_add_resources(zeit_RESOURCES_RCC ${zeit_RSRCS})
 add_executable(zeit ${zeit_SRCS} ${zeit_HEADERS_MOC} ${zeit_FORMS_HEADERS}
                     ${QM_FILES} ${zeit_RESOURCES_RCC})
+target_include_directories(zeit PRIVATE ${Qt5Core_INCLUDE_DIRS}
+                           ${Qt5Widgets_INCLUDE_DIRS}
+                           ${CMAKE_CURRENT_SOURCE_DIR}/../crontablib
+                           ${CMAKE_CURRENT_BINARY_DIR})
 target_link_libraries(zeit crontab ${qt_LIBS})
 target_compile_features(zeit PRIVATE cxx_lambdas cxx_nullptr cxx_unicode_literals)
 
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 2aa147d..9092b19 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,10 +1,9 @@
-include_directories(
-    ${CMAKE_CURRENT_SOURCE_DIR}/../crontablib
-    ${CMAKE_CURRENT_BINARY_DIR}
-)
-
-set(test_LIBS Qt5::Core Qt5::Test)
+set(test_LIBS Qt5::Core Qt5::Gui Qt5::Test)
 set(tests_SRCS tests.cpp)
 add_executable(tests ${tests_SRCS})
+target_include_directories(tests PRIVATE ${Qt5Core_INCLUDE_DIRS}
+                           ${Qt5Gui_INCLUDE_DIRS}
+                           ${CMAKE_CURRENT_SOURCE_DIR}/../crontablib
+                           ${CMAKE_CURRENT_BINARY_DIR})
 target_link_libraries(tests crontab ${test_LIBS})
 target_compile_features(tests PRIVATE cxx_nullptr)