diff --git a/sketchlib/CMakeLists.txt b/sketchlib/CMakeLists.txt
index 8eb9541..e7e4af8 100644
--- a/sketchlib/CMakeLists.txt
+++ b/sketchlib/CMakeLists.txt
@@ -1,3 +1,7 @@
+find_package(Qt5Core CONFIG REQUIRED)
+find_package(Qt5Gui CONFIG REQUIRED)
+find_package(Qt5Widgets CONFIG REQUIRED)
+
 set(HEADERS
     basecontainer.h
     containerfactory.h
diff --git a/sketchviewer/CMakeLists.txt b/sketchviewer/CMakeLists.txt
index 2aaa44b..b37a074 100644
--- a/sketchviewer/CMakeLists.txt
+++ b/sketchviewer/CMakeLists.txt
@@ -1,3 +1,6 @@
+find_package(Qt5Core CONFIG REQUIRED)
+find_package(Qt5Network CONFIG REQUIRED)
+
 set(HEADERS
 )