AC_INIT(riscv-tests, 1.0) cross_compiling=yes AC_PROG_CC AC_ARG_WITH(xlen, [AS_HELP_STRING([--with-xlen=XLEN], [Set XLEN, the X-register bit width (default is 64)])], AC_SUBST(XLEN, $withval), AC_SUBST(XLEN, 64) ) AC_OUTPUT( Makefile )