--- CMakeLists.txt.orig	2020-04-23 11:51:20 UTC
+++ CMakeLists.txt
@@ -9,6 +9,8 @@ set(ECM_MIN_VERSION     "1.7.0")
 
 cmake_minimum_required(VERSION ${CMAKE_MIN_VERSION})
 
+cmake_policy(SET CMP0063 OLD) # Suppress visibility warnings
+
 execute_process(COMMAND ${CMAKE_COMMAND} --version OUTPUT_VARIABLE VERSION_CMAKE_INFO)
 message(STATUS "CMake version: ${VERSION_CMAKE_INFO}")