Things go wrong — required system libraries are missing at compile-time!

  unresolved symbol __svml_log2
  undefined symbol _expf

• Source includes calls to routines svml_log2, expf. . .  
• Need to add libraries (e.g., libm.so) to compiler/linker command, e.g.,

        gfortran mycode.f90 -lm -lsvml -o myprog

---

  libgfortran.so: undefined reference to sin...

• Gfortran requires libgfortran.so. . .  
• . . .  in turn looks to libm.so for maths functions. . .  

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