I don't know if this is a MySQL 5.0 vs 5.1 issue or a OS-X issue, but
this should be pretty harmless (right?):
--- devel/acinclude.m4 2007-03-19 21:05:23.000000000 +0200
+++ devel-mine/acinclude.m4 2007-03-19 22:44:13.000000000 +0200
@@ -105,6 +105,9 @@
ADDIFLAGS="$IBASE/storage/ndb"
ADDIFLAGS="$ADDIFLAGS $IBASE/storage/ndb/ndbapi"
ADDIFLAGS="$ADDIFLAGS $IBASE/storage/ndb/mgmapi"
+ ADDIFLAGS="$ADDIFLAGS $IBASE/ndb"
+ ADDIFLAGS="$ADDIFLAGS $IBASE/ndb/ndbapi"
+ ADDIFLAGS="$ADDIFLAGS $IBASE/ndb/mgmapi"
CFLAGS="$CFLAGS $ADDFLAGS $ADDIFLAGS"
CXXFLAGS="$CXXFLAGS $ADDFLAGS $ADDIFLAGS"