What is the issue I have when trying to create this MEX function.

I want to create a MEX function for this function:

function [CrispOut,UNR] = T2FCMfis_ForMex(InI,m,R,SM)
%#codegen
[rules,dim,gen]=size(R); in=dim-1;
UNR=zeros(rules,dim); UNrule=zeros(gen,dim,rules);
for i=1:rules
    UNrule(:,:,i)=(reshape(R(i,:,:),[dim,gen])');
    UNR(i,:)=( SM(i,:)*UNrule(:,:,i) )./sum(SM(i,:));
end
mu=FCMmembership(InI,m,UNR(:,1:in));
nmu=(mu-min(mu))./(max(mu)-min(mu));
CrispOut=(nmu*UNR(:,dim))/sum(nmu);
end

My objective is to evaluate if it would perform faster. The thing is that for some cases this function will work with very large R and SM inputs.

With the purpose of creating the MEX function I followed the instructions on the MatLab help and firstly loaded to the workspace the following:

InI=[0.12,0.7,0.23];
R(:,:,1)=[0.9,1,0,0.1;0.2,0.9,0.05,0.2;0.1,0.8,0.1,0.3;0,0.7,0.1,0.7;0,0.5,0.2,0.9;];
R(:,:,2)=[0.91,0.9,0.05,0.15;0.21,0.91,0.1,0.22;0.2,0.9,0.15,0.32;0.01,0.65,0.15,0.75;0,0.6,0.2,1;];
R(:,:,3)=[2,2,2,2;0.2,0.91,0.1,0.21;0.1,0.8,0.1,0.35;2,2,2,2;0.1,0.55,0.23,1.1;];
SM=[0.3,1,0;0.1,1,0.4;0.2,1,0.05;0.9,1,0;0.6,1,0.1;];
m=2;

Afterwards I tried to create the MEX file with this command:

-args {InI, m, R, SM} T2FCMfis.m

I got the following error:

Error in ==> T2FCMfis_ForMex Line: 1 Column: 1
Code generation failed: Open error report.
Error using codegen

So I went to the error report and found out this:

      1   xcrun  -sdk macosx10.7  clang -c -fno-common -arch x86_64 -isysroot  -mmacosx-version-min=10.7  -fexceptions -DMX_COMPAT_32 -O2 -DNDEBUG  -I "/Applications/MATLAB_R2013a.app/simulink/include" -I "/Applications/MATLAB_R2013a.app/toolbox/shared/simtargets" -I "/Applications/MATLAB_R2013a.app/rtw/ext_mode/common" -I "/Applications/MATLAB_R2013a.app/rtw/c/src/ext_mode/common" -I "/Users/luisalbertotorressalomao/Dropbox/MATLAB/GT2_GD_RL_AC_Modelling/MEX_Programs" -I "/Users/luisalbertotorressalomao/Dropbox/MATLAB/GT2_GD_RL_AC_Modelling/MEX_Programs/codegen/mex/T2FCMfis_ForMex" -I "/Applications/MATLAB_R2013a.app/extern/include" "T2FCMfis_ForMex_data.c"
      2   xcrun: error: SDK "macosx10.7" cannot be located
      3   clang: warning: no such sysroot directory: '-mmacosx-version-min=10.7'
      4   In file included from T2FCMfis_ForMex_data.c:12:
      5   /Users/luisalbertotorressalomao/Dropbox/MATLAB/GT2_GD_RL_AC_Modelling/MEX_Programs/codegen/mex/T2FCMfis_ForMex/T2FCMfis_ForMex.h:13:10: fatal error: 
      6         'math.h' file not found
      7   #include 
      8            ^
      9   1 error generated.
     10   gmake: *** [T2FCMfis_ForMex_data.o] Error 1

I think this has to do with my computer and 'SDK "macosx10.7"'. What can I do? Any help will be greatly appreciated since this is the time I try this.