Build errors with today's (4-21-08) snapshot

["Gary Baluha" <gumby3203 (at) gmail.com>]

gcc -g -O2 -Wall -Wno-unused -D_REENTRANT -D_LARGEFILE_SOURCE
-D_FILE_OFFSET_BITS=64 -DLINUX -I.
-I/usr/local/src/hobbit-sources/hobbit-snap-4.21.2008/include
-I/usr/local/include -c -o client_config.o client_config.c
gcc  -o hobbitd_rrd -Wl,--rpath,/usr/lib -Wl,--rpath,/usr/local/lib
-Wl,--rpath,/usr/local/rrdtool-1.2.26/lib -Wl,--rpath,/var/hobbit/server/bin
hobbitd_rrd.o      hobbitd_worker.o hobbitd_buffer.o do_rrd.o
client_config.o ../lib/libhobbit.a -L/usr/local/rrdtool-1.2.26/lib -lrrd
-L/usr/local/lib -lpng -L/usr/local/lib -lpcre -L/usr/lib -lz
/usr/local/rrdtool-1.2.26/lib/librrd.so: undefined reference to `art_free'
/usr/local/rrdtool-1.2.26/lib/librrd.so: undefined reference to `art_alloc'
collect2: ld returned 1 exit status
make[1]: *** [hobbitd_rrd] Error 1
make[1]: Leaving directory
`/usr/local/src/hobbit-sources/hobbit-snap-4.21.2008/hobbitd'
make: *** [hobbitd-build] Error 2

I have two version of rrdtool installed: 1.2.26 and 1.2.23.  The release
version of 4.2.0 appears to compile fine with 1.2.26, and it's just the
latest snapshot that is having problems.