I am new to MAC environment and Xcode. I had downloaded the Acrobat XI SDK for MAC and started implementing digital signature calls such as SecSignTransformCreate using Mac OS X 10.7 SDK with Xcode 4.3.3 and OS MAC 10.7.5 in the DocSign sample provided by Acrobat XI SDK. Now the AVCalls provided in the SDK are throwing compiler errors. The compiler for Objective-C++ is LLVM GCC 4.2. Any help would be appreciated.