diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -142,6 +142,7 @@ add_executable(${PROGRAM_NAME} WIN32
   src/updatechecker.cpp
   src/versionnumber.cpp
   src/updatecheckdialog.cpp
+  src/samplepack.cpp
   misc/windows_icon.rc
   ${UI_FILES}
   ${RES_FILES}
@@ -239,6 +240,13 @@ if (UNIX)
     COMMAND ${CMAKE_COMMAND} -P ${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake)
 endif (UNIX)
 
+# testing
+set(ENABLE_TESTS false CACHE BOOL "Build tests.")
+if (ENABLE_TESTS)
+  enable_testing()
+  add_subdirectory(tests)
+endif ()
+
 # packaging
 include(BuildLinuxAppImage)