thanks, i think I was in need of a good ol apt-get update
EDIT: now having issues with the build...
json/json_spirit_writer_template.h:79:63: warning: comparison is always true due to limited range of data type [-Wtype-limits]
^[[Bvirtual memory exhausted: Cannot allocate memory
Makefile:2062: recipe for target 'libbitcoin_server_a-bitcoinrpc.o' failed
make[1]: *** [libbitcoin_server_a-bitcoinrpc.o] Error 1
make[1]: Leaving directory '...'
Makefile:482: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1
trying to build again, i'll report back