How to include <cstring> in a Cocoa project

Question

I'm having trouble getting xcode to find a particular header file, namely cstring.

My project compiled properly until I added a new library. The library, oscpack, consists of .h and .cpp files. I copied these into my project. Some of these files include cstring. Now when I try to compile I get this error:

Lexical or Preprocessor Issue
(...)/xcode4/osc/OscOutboundPacketStream.h:40:10: 'cstring' file not found

I'm new to C++ and I'm still a bit mystified regarding header file locations. Does anyone know where to find cstring on my system, and how I should tell xcode to look for it there?

EDIT

I ran sudo find . -name "*cstring*"and located the header file. It's here:

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/c++/4.2.1/cstring

Now how do I tell XCode to search there?

EDIT 2

I tried adding $(SDKROOT)/usr/include/c++/4.2.1 to my Header Search Paths. I entered a world of pain. Dozens of compiler errors were thrown, starting with these.

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/c++/4.2.1/bits/c++config.h
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/c++/4.2.1/bits/c++config.h:153:1: Unknown type name 'namespace'
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/c++/4.2.1/bits/c++config.h:153:1: Expected ';' after top level declarator

Answer 1

<cstring> is a C++ header. Is the problem that you're building the file that includes it as C or Objective-C and not as C++ or Objective-C++?

oscpack describes itself as a C++ library, so you'll need to be using C++ anywhere you include its headers.