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OSX, Clang++, and getcwd

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I've been working on getting the NLS Engine compiling and running under Mac OSX. After upgrading to Xcode 4.3, and configuring the project to use clang++ 3.1 as I found that Apple still hasn't upgraded g++ past 4.2, and we need the C++11 support, I found that there was a little problem hiding in the scriptbuilder add-on.

Everything was going well until scriptbuilder.cpp threw a compilation error: down on line 866 it complained that getcwd was an undeclared identifier. The fix was to just make sure that unistd.h was #included:

@@ -11,5 +11,5

-#if defined(AS_MARMALADE)
+#if defined(AS_MARMALADE) || defined(__APPLE__)
#include <unistd.h>

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