Cocoapods Link Error: __FBTweakIdentifier (with custom build configuration)

Trying to get set up with Tweaks, added the pod to my podfile:

pod 'Tweaks'

Got the FBTweakShakeWindow integrated and displaying 0 items (as expected), went to add my first tweak as such:

self.alpha = FBTweakValue(@"Category", @"Thing", @"Alpha", .6, 0.1, 1.0);

When I went to build I got a Linker Error:

Undefined symbols for architecture i386: "__FBTweakIdentifier"

I see the externs defined in FBTweakInline.m and FBTweakinlineInternal.h, but I can't get this resolved.

Any suggestions on what I might have missed or what the problem might be?

Many thanks.

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