Yes, we changed our directory structure.  Look under clisp/src/beta/ldb
instead.  There are now three major subtrees of clisp:
src/{alpha,beta,default} holds the sources for each release (the same on
all systems.)
build/{rt_mach,pmax_mach,sun4_mach,sun4c_41}/{alpha,beta,default} hold
compiled binaries for each system.  rcs/ holds the RCS source tree.