Xcode 5.1: missing required architecture arm64

Just upgraded to Xcode 5.1, getting the following error:

ignoring file ...Dependencies/SalesforceNetworkSDK/libSalesforceNetworkSDK.a, missing required architecture arm64 in file ...Dependencies/SalesforceNetworkSDK/libSalesforceNetworkSDK.a (3 slices)

If I turn off build active archs only and remove arm64 from valid archs I get:

Build/Products/Debug-iphoneos/libPods.a, file was built for archive which is not the architecture being linked (armv7)

According to apple's release note, see the following note point.

Note:

Be aware of the following architectures issues when opening your existing projects in Xcode 5.1:

• When building for all architectures, remove any explicit architectures setting and use the default Standard Architectures setting. For projects that were previously opted-in using “Standard Architectures Including 64-Bit”, switch back to the “Standard architectures” setting.
• When opening an existing project for the first time, Xcode 5.1 may display a warning about the use of the Xcode 5.0 architectures setting. Selecting the warning provides a workflow to revise the setting.
• Projects not able to support 64-bit need to specifically set the architectures build setting to not include 64-bit.

So you've to set architecture as below to support libs architecture.

Reference from this post.

Update: From May 15, you've to take build from 5.1.1, see this post.

Don't know previous iOS but Setting Build Active Architecture Only to YES in iOS 8 did the trick.