> creating a frontend on MAC Sierra OSX 10
> include the midas.h file and when compiling with XCode I get an error based on
> this entry in the midas.h include
> 
> #if !defined(OS_IRIX) && !defined(OS_VMS) && !defined(OS_MSDOS) &&
> !defined(OS_UNIX) && !defined(OS_VXWORKS) && !defined(OS_WINNT)
> #error MIDAS cannot be used on this operating system
> #endif
> 
> 
> Perhaps I should not use Xcode?
> Perhaps I won't need Midas.h?
> 
> The MIDAS system is running on my MAC but I need to add a very simple front end
> for testing and I encounted this error.

If you compile with the included Makefile, you will see a 

-DOS_LINUX -DOS_DARWIN

flag which tells the compiler that we are on a mac. If you do this with XCode, you have to do it via "Build Settings" (see 
attached picture).

Stefan