+#ifdef HAVE_mpc
+#include <mpc.h>
+# ifdef HAVE_mpc
+extern tree do_mpc_arg2 (tree, tree, tree, int, int (*)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t));
+# endif
+# if MPC_VERSION >= MPC_VERSION_NUM(0,6,1)
+# define HAVE_mpc_pow
+# endif
+# if MPC_VERSION >= MPC_VERSION_NUM(0,7,1)
+# define HAVE_mpc_arc
+# endif
+#endif