websocketpp-0.8.1-cmake-configversion-compatibility-anynewerversion.patch from Fedora:
# Switch from ExactVersion to AnyNewerVersion to improve compatibility
# https://cmake.org/cmake/help/v3.0/module/CMakePackageConfigHelpers.html
# Fixes build failure of tomahawk, which uses "find_package(websocketpp 0.2.99 REQUIRED)"
# PR submitted upstream: https://github.com/zaphoyd/websocketpp/pull/740
# Disable check for same 32/64bit-ness in websocketpp-configVersion.cmake by setting CMAKE_SIZEOF_VOID_P
# PR submitted upstream: https://github.com/zaphoyd/websocketpp/pull/770

--- a/CMakeLists.txt	2018-10-31 13:58:03.000000000 +0100
+++ b/CMakeLists.txt	2018-10-31 14:21:06.251424022 +0100
@@ -266,9 +266,11 @@
   INSTALL_DESTINATION "${INSTALL_CMAKE_DIR}"
   NO_CHECK_REQUIRED_COMPONENTS_MACRO
 )
+# disable check for same 32/64bit-ness in websocketpp-configVersion.cmake by setting CMAKE_SIZEOF_VOID_P
+set (CMAKE_SIZEOF_VOID_P "")
 write_basic_package_version_file("${PROJECT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/websocketpp-configVersion.cmake"
   VERSION ${WEBSOCKETPP_VERSION}
-  COMPATIBILITY ExactVersion)
+  COMPATIBILITY AnyNewerVersion)
 
 # Install the websocketpp-config.cmake and websocketpp-configVersion.cmake
 install (FILES