How to link with framework without arm64 support in Xcode 5.1?

Question

After upgraded a project on Xcode 5.1, Product > Build gives the following warning and error:

ld: warning: ignoring file Dropbox/Dropbox.framework/Dro

Answer 1

Change:

• Architectures: Standard
• Valid Architectures: arm64 armv7 armv7s

To:

• Architectures: armv7 armv7s
• Valid Architectures: armv7 armv7s