Ok so that was not it then. New strategy.

I opened my indi project in QT Creator and found MSG_NOSIGNAL in the code of indiserver.cpp. I right clicked on it and said to "Follow Symbol under cursor" and it took me to Socket.h which was in my Xcode sdk in this folder:

/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/sys/socket.h

It is there that this symbol was defined.

#if __DARWIN_C_LEVEL >= 200809L
#define MSG_NOSIGNAL 0x80000 /* do not generate SIGPIPE on EOF */
#endif /* __DARWIN_C_LEVEL */

I checked at the top of the indiserver.cpp file and indeed it says "#include <sys/socket.h>" so this file should be included and the symbol should be defined I would think. Do you have Xcode installed on your machine with the latest SDK?

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