-STEPMAKE_GUILE_DEVEL(REQUIRED, 1.6.7)
-STEPMAKE_MAKEINFO(REQUIRED, 4.8)
+
+## should check for 1.8.2 ?
+STEPMAKE_GUILE_DEVEL(REQUIRED, 1.8.0)
+
+
+## check rational bugfix.
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="$GUILE_CFLAGS $CPPFLAGS"
+AC_MSG_CHECKING(GUILE rational bugfix)
+AC_TRY_CPP(
+#include <libguile.h>
+#ifdef SCM_FRACTION_REDUCED_BIT
+#error
+#endif
+,
+AC_MSG_RESULT(ok),
+REQUIRED="$REQUIRED GUILE-with-rational-bugfix"
+AC_MSG_RESULT(Must have patched GUILE rational support. See INSTALL.txt))
+CPPFLAGS="$save_CPPFLAGS"
+
+
+# We check for makeinfo below, too. Really duplicate that check?
+## STEPMAKE_MAKEINFO(REQUIRED, 4.11)