cache install prefix

Author: scivision

options.cmake

@@ -12,8 +12,8 @@ option(CMAKE_TLS_VERIFY "Verify TLS certificates" true)
 
 include(GNUInstallDirs)
 
-if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT AND ${PROJECT_NAME}_IS_TOP_LEVEL)
-  set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/local" CACHE PATH "install prefix" FORCE)
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT AND PROJECT_IS_TOP_LEVEL)
+  set_property(CACHE CMAKE_INSTALL_PREFIX PROPERTY VALUE "${PROJECT_BINARY_DIR}/local")
 endif()
 
 set_property(DIRECTORY PROPERTY EP_UPDATE_DISCONNECTED true)