This complains about objective-C. Try 
CC=clang OBJC=clang

François

On Friday, November 10, 2017 at 12:35:48 PM UTC+13, Ahmed Allibhoy wrote:
>
> Hi, 
>
> I am trying to install matplotlib on sage with the OSX backend so I can 
> get interactive plots. Using
>
>     sage -pip install -U matplotlib 
>
> fails with the error:
>
>     building 'matplotlib.backends._macosx' extension
>     gcc -fno-strict-aliasing 
> -I/Applications/SageMath/local/var/tmp/sage/build/python2-2.7.13.p1/include 
> -DNDEBUG -g -fwrapv -O3 -Wall -Wno-unused -I/usr/local/include 
> -I/usr/include -I/usr/X11/include -I/opt/X11/include -I. 
> -I/Applications/SageMath/local/include/python2.7 -c src/_macosx.m -o 
> build/temp.macosx-10.9-x86_64-2.7/src/_macosx.o
>     gcc: error: src/_macosx.m: Objective-C compiler not installed on this 
> system
>     error: command 'gcc' failed with exit status 1
>
> I suspect that this is due to using gcc rather than clang to compile 
> matplotlib. Setting CC=clang doesn't fix the issue, however, and I am 
> unsure of how to build using clang. Does anyone know of a work around?
>
>

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