Build errors in OSX 10.9 Mavericks

[borogove]

Trying to build CumulusServer on OSX, I get:

creating CumulusServer executable CumulusServer
ld: warning: ignoring file ./../CumulusLib//libCumulus.dylib, file was built for x86_64 which is not the architecture being linked (i386): ./../CumulusLib//libCumulus.dylib
ld: warning: ignoring file /usr/local/lib//libPocoFoundation.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/lib//libPocoFoundation.dylib
ld: warning: ignoring file /usr/local/lib//libPocoXML.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/lib//libPocoXML.dylib
ld: warning: ignoring file /usr/local/lib//libPocoUtil.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/lib//libPocoUtil.dylib
ld: warning: ignoring file /usr/local/lib//libPocoNet.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/lib//libPocoNet.dylib
ld: warning: ignoring file /usr/local/lib//libluajit-5.1.dylib, file was built for x86_64 which is not the architecture being linked (i386): /usr/local/lib//libluajit-5.1.dylib
Undefined symbols for architecture i386:
"DetectMemoryLeak()", referenced from:
_main in main.o
"Poco::ThreadImpl::currentImpl()", referenced from:
Poco::Thread::current() in main.o
...

Followed by many additional undefined symbols. I built poco locally with configure && make, built CumulusLib locally with make, installed luajit via homebrew, and then just did make to build CumulusServer.

Obviously the problem is all the libs are x86_64, while the server is trying to build i386, but I don't see anything in the makefiles for either CumulusLib or CumulusServer that's obviously controlling that. My environment includes:

CFLAGS='-arch x86_64 -arch i386'
CXXFLAGS='-arch x86_64 -arch i386'
LDFLAGS='-arch x86_64 -arch i386'

So I would expect fat (32/64-bit) binaries to be built by default.