If you don’t have XCode, then you don’t have XCode tools. You can download 
XCode from the App store.

This error:
>  The CMAKE_C_COMPILER:
> 
> 
> 
>     
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
> 
> 
> 
>   is not a full path to an existing compiler tool.

is saying that the application Xcode.app (which is where the command line tools 
are installed), is not there. Install that first.

Best,

Luca. 

> On 5 Jun 2017, at 13:11, Sudarshan Kumar <skkma...@gmail.com> wrote:
> 
> 
> 
> On Monday, June 5, 2017 at 1:49:01 PM UTC+5:30, Luca Heltai wrote:
> No need to restore to the old version. I have 10.12.5 myself. 
> 
> Can you try running xcode, and see if it asks you wether you want to upgrade 
> the command line tools? 
> 
> 
> I have run the command  "xcode-select --install"  but I do not see Xcode.app 
> in the /Applications  directory, something messed up.
> 
> Still I ge the following  error message in step-1
> 
> -- The C compiler identification is unknown
> 
> CMake Error at CMakeLists.txt:38 (PROJECT):
> 
>   The CMAKE_C_COMPILER:
> 
> 
> 
>     
> /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
> 
> 
> 
>   is not a full path to an existing compiler tool.
> 
> 
> 
>   Tell CMake where to find the compiler by setting either the environment
> 
>   variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
> 
>   the compiler, or to the compiler name if it is in the PATH.
> 
> 
> 
> 
> 
> -- Configuring incomplete, errors occurred!
> 
> See also 
> "/Applications/deal.II-8.5-brew.app/Contents/Resources/examples/step-1/CMakeFiles/CMakeOutput.log".
> 
> See also 
> "/Applications/deal.II-8.5-brew.app/Contents/Resources/examples/step-1/CMakeFiles/CMakeError.log".
> 
>  
> 
> L. 
> 
> > On 5 Jun 2017, at 8:22, Sudarshan Kumar <skkm...@gmail.com> wrote: 
> > 
> > 
> > 
> > On Monday, June 5, 2017 at 11:39:28 AM UTC+5:30, Luca Heltai wrote: 
> > Did you install xcode and xcode-tools? 
> > 
> > It looks like deal.II cannot find a lot of things… 
> > 
> > The application opens a terminal and tries to figure out if you did. Does 
> > the terminal open up with no issues? 
> > 
> > 
> > Terminal opens with no issue. In fact  I have  upgraded my mac book pro 
> > retina  from yosemite to  sierra.  Do you think  I need to restore back to 
> > my old version? 
> > Thanks in advance.. 
> > L. 
> > 
> > 
> > 
> > > On 5 Jun 2017, at 8:00, Sudarshan Kumar <skkm...@gmail.com> wrote: 
> > > 
> > > I have  installed deal.II-8.5-brew in my mac  ( macOS sierra, version 
> > > 10.12.5). Failed to compile  step-1 of examples. I have attached the 
> > > error log files. Any help is very much appreciated. 
> > > Thanks a lot in advance. 
> > > 
> > > -- 
> > > The deal.II project is located at http://www.dealii.org/ 
> > > For mailing list/forum options, see 
> > > https://groups.google.com/d/forum/dealii?hl=en 
> > > --- 
> > > You received this message because you are subscribed to the Google Groups 
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> > > To unsubscribe from this group and stop receiving emails from it, send an 
> > > email to dealii+un...@googlegroups.com. 
> > > For more options, visit https://groups.google.com/d/optout. 
> > > <CMakeError.log><CMakeOutput.log> 
> > 
> > 
> > -- 
> > The deal.II project is located at http://www.dealii.org/ 
> > For mailing list/forum options, see 
> > https://groups.google.com/d/forum/dealii?hl=en 
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> 
> 
> -- 
> The deal.II project is located at http://www.dealii.org/
> For mailing list/forum options, see 
> https://groups.google.com/d/forum/dealii?hl=en
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