OK, just noticed the following warning:
ignoring file /Users/.../Library/Developer/Xcode/DerivedData/PlascoTrac-ginlxeicfonetcaicpyggfpyuxrj/Build/Products/Debug-iphoneos/libRestKit.a, file was built for archive which is not the architecture being linked (armv7s): /Users/.../Library/Developer/Xcode/DerivedData/PlascoTrac-ginlxeicfonetcaicpyggfpyuxrj/Build/Products/Debug-iphoneos/libRestKit.a
so I went to the Restkit target and changed the architecture to
Standard (armv7, armv7s)
and voila!
Leaving this question and answer here, because I do not see the exact equivalent here, and it may be useful to others,
Greetings.
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