nubs@gentoo-dev ~/dev/bitcoin-v0_5_3_1 $ ./auto.sh 
Found realpath.
Found curl.
Found 'openssl-1.0.1g', skipping...
Found 'db-4.8.30', skipping...
Found 'boost_1_52_0', skipping...
g++ -c -pthread -Wno-invalid-offsetof -Wformat -g -DNOPCH -I/home/nubs/dev/bitcoin-v0_5_3_1/ourlibs/include -I/home/nubs/dev/bitcoin-v0_5_3_1/ourlibs/include -I/home/nubs/dev/bitcoin-v0_5_3_1/ourlibs/include -fno-stack-protector -fstack-protector-all -Wstack-protector -Wl,-z,relro -Wl,-z,now -D_FORTIFY_SOURCE=2 -O2 -std=c++03 -MMD -o obj/nogui/checkpoints.o checkpoints.cpp
cc1plus: error: unrecognized command line option "-std=c++03"
makefile.unix:120: recipe for target 'obj/nogui/checkpoints.o' failed
make: *** [obj/nogui/checkpoints.o] Error 1
strip: 'bitcoind': No such file
Done!