I STILL cannot create a precompiled header. The first error is
from /Working/XcProjects/GP3/GP3-ProjectManager/GPT_Prefix.Debug.pch:38:
from /Working/XcProjects/GP3/GP3-ProjectManager/../CommonSources/GP3_Prefix.h:358,
from /Working/XcProjects/AurbachLib/CrossPlatform/Headers/XPreCompile.h:49,
from /Working/XcProjects/AurbachLib/CrossPlatform/Headers/XTypes.h:25,
from /Working/XcProjects/AurbachLib/CrossPlatform/Headers/XMacros.h:89,
In file included from /Working/XcProjects/Open-PowerPlant/PowerPlant/Utility Classes/UDebugging.h:96,
/Working/XcProjects/Open-PowerPlant/PowerPlant/Support Classes/LException.h:15:21: error: exception: No such file or directory
Looking in LException.h to see what Xcode is complaining about, I see
#include <exception>