HP-UX /opt/aCC/lbin/ecom: Execute permission denied

I'm trying to compile cpp code on HP-UX machines. It gave me following errors.
What may be the reason?

Thanks in advance.

root@localhost> uname -ar
HP-UX localhost B.11.23 U ia64 2143951832 unlimited-user license
root@localhost> cat test.cpp 
#include <iostream.h>
int main()
{
      int x,y;
      cout << "Enter an integer: ";
      cin >> x;
      y = x * 2;
      cout << "\n" << y <<" is twice " << x <<".\n";
}
root@localhost> make test
        aCC -O test.cpp  -o test
sh: /opt/aCC/lbin/ecom: Execute permission denied.
*** Error exit code 1

Stop.
root@localhost> ls -ltr /opt/aCC/lbin/ecom
-rwxr-xr-x   1 bin        bin        19089469 Apr 19  2006 /opt/aCC/lbin/ecom

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