Clang (omp version) missing map and utility headers

I'm experiencing some sort of issue trying to compile a perfectly (windows+linux tested) mpi+openmp software I wrote my own. I've managed to install and set to work the omp-adapted version of clang, and it works flawlessly in a simple omp "hello world" I've prepared. As well I've installed open-mpi via homebrew, and the mpi "hello world" is working as well. Now there come the issue. Firstly, not so much confident in clang and openmp working together, I've created a version of my software without openmp calls. This version (MPI-only) of the code has been compiled with no issue.

Now comes my real dilemma. I've reverted back the omp sections of my code, and tried to compile it with both MPI and openMP flags (mpic++ wrapper with ompclang forced in and -fopenmp flag added). The output of the compiler verbose mode is here below.

[...]
/usr/local/Cellar/open-mpi/1.8.4/include/openmpi/ompi/mpi/cxx/mpicxx.h:39:10: 
fatal error: 'utility' file not found
#include <utility>
         ^
[...]
/usr/local/Cellar/open-mpi/1.8.4/include/openmpi/ompi/mpi/cxx/mpicxx.h:39:10: 
fatal error: 'utility' file not found
#include <map>
         ^
[...]

After this output I tried to compile something like this:

#include <iostream>
#include <map>
#include <utility>

int main(int argc,char* argv[]){
    std::cout<<"Hello World!!!!"<<std::endl;
    return 0;
}

And the output keeps me saying the compiler can't find map, utility AND iostream as well.

It appears to me the problem is the compiler doesn't know where to find the standard c++ libraries. Can anyone of you tell me how to solve this? Thanks in advance

Have fun,

gf