Mex function with OS X 10.9.5 and Xcode 6.2? - xcode

Question

I'm using Matlab Coder in Matlab-r2014b in OS X 10.9.5. I have Xcode 6.2. I'm unable to generate a Mex function using Matlab compiler. I'm reporting here a sample code with structure and type of variables similar to my real one.
1) The script that calls the entry-point
clear all
N=3 ;
Res=alg(N);
2) The entry-point
function val=alg(N)
profindex=randi(N+1,2^(N-1),1);
for s=1:10
coder.varsize('matrix');
matrix=zeros(1,3*N+2);
for k=1:2^(N-1)
if profindex(k)==N-1
matrix=[matrix; randi(1,1,3*N+2)];
end
end
if size(matrix,1)>1
matrix(1,:)=[];
end
for k=1:size(matrix,1)
for h=1:size(matrixfinal,1)
if sum(matrix(k,2+2*N:3*N)==matrixfinal(h,2+2*N:3*N))==N-1
matrixfinal(h,3*N+1)=matrixfinal(h,3*N+1)+matrix(k,3*N+1);
matrixfinal(h,3*N+2)=matrixfinal(h,3*N+2)+matrix(k,3*N+2);
end
end
end
end
if size(matrixfinal,1)>1
matrixfinal(1,:)=[];
end
val=matrixfinal(1,1);
end
When I try to built the Mex Function I get the following error
??? Build error: Compilation returned error status code 2. See the
target build log in the report for further details.
Error in ==> alg Line: 1 Column: 1 Code generation failed: Open error report.
If I open error report, It reads
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 ".... 2 xcodebuild: error: SDK "macosx10.7" cannot be located. 3 xcrun: error: unable to find utility "clang", not a
developer tool or in PATH 4 gmake: *** [alg_mexutil.o] Error 72
I found these instructions but they are for 10.8 and if I replace 10.8 with 10.9.5 it does not work and I get always the same errors and in the following order
SDK "macosx10.7" cannot be located
SDK "macosx10.8" cannot be located
SDK "macosx10.9.5" cannot be located.
How to fix these errors?