Eu tenho um projeto MonoTouch que constrói e roda bem no i386 / iOS Simulator. O projeto faz referência a uma biblioteca nativa (Obj-C), que converti em uma DLL MonoTouch usando o processo btouch conforme descrito em BindingSample da Xamarin:

https://github.com/xamarin/monotouch-samples/tree/eb640165f0485ff59b2f80e73ccff382bf4f2083/BindingSample/src/binding

Portanto, meu makefile constrói todas as três arquiteturas (i386, armv6 e armv7), combina as três saídas a uma biblioteca 'Universal' e, finalmente, usa o btouch para gerar uma DLL do MonoTouch.

Para ter certeza de que minha biblioteca universal contém todas as três arquiteturas, verifiquei comlipo -infoe, na verdade, contém i386, armv6 e armv7.

No entanto, quando estou construindo para implantação em um dispositivo iOS real, recebo os seguintes erros:

Undefined symbols for architecture armv7:
  "_ABAddressBookCreate", referenced from:
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_ABAddressBookCopyArrayOfAllPeople", referenced from:
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_ABAddressBookGetPersonCount", referenced from:
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_ABRecordCopyValue", referenced from:
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_kABPersonFirstNameProperty", referenced from:
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_kABPersonLastNameProperty", referenced from:
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
      -[ContactsTokenField setupSms] in libContactsTokenFieldViewUniversal.a(ContactsTokenField.o)
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_ABMultiValueGetCount", referenced from:
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_ABMultiValueCopyLabelAtIndex", referenced from:
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_ABMultiValueCopyValueAtIndex", referenced from:
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_kABPersonEmailProperty", referenced from:
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
  "_kABPersonPhoneProperty", referenced from:
      -[TITokenFieldView setupWithAddressType:prompt:] in libContactsTokenFieldViewUniversal.a(TITokenField.o)
ld: symbol(s) not found for architecture armv7
collect2: ld returned 1 exit status

mtouch exited with code 1

O que estou fazendo de errado?