+/* The configure-time prefix, i.e., the value supplied as the argument
+ to --prefix=. */
+extern const char cpp_PREFIX[];
+/* The length of the configure-time prefix. */
+extern const size_t cpp_PREFIX_len;
+/* The configure-time execution prefix. This is typically the lib/gcc
+ subdirectory of cpp_PREFIX. */
+extern const char cpp_EXEC_PREFIX[];
+/* The run-time execution prefix. This is typically the lib/gcc
+ subdirectory of the actual installation. */
+extern const char *gcc_exec_prefix;
+
+/* Return true if the toolchain is relocated. */
+bool cpp_relocated (void);
+