test -z "$YACC" && AC_MSG_WARN([GNU bison not found])
AC_CHECK_PROGS(TCLSH, tclsh8.5 tclsh8.4 tclsh8.3 tclsh8.2, tclsh)
AC_PROG_INSTALL
test -z "$YACC" && AC_MSG_WARN([GNU bison not found])
AC_CHECK_PROGS(TCLSH, tclsh8.5 tclsh8.4 tclsh8.3 tclsh8.2, tclsh)
AC_PROG_INSTALL