tweak cmake

Author: irishpatrick

CMakeLists.txt

@@ -16,4 +16,6 @@ target_include_directories(${PROJECT_NAME} PRIVATE include)
 # Pull in our pico_stdlib which pulls in commonly used features
 target_link_libraries(${PROJECT_NAME} pico_stdlib hardware_pwm)
 
-add_subdirectory(examples)
+if (${BUILD_EXAMPLES})
+        add_subdirectory(examples)
+endif()