[donev@pc346g-02 solutions]$ f90-vast -c worksheet5.f90
 Pacific-Sierra Research vf90 Personal   V3.4N5 15:11:36  12/ 7/00   f90 to f77  
    module  ERF_TIMING
[donev@pc346g-02 solutions]$ f90-vast worksheet5.main.f90 -o worksheet5.x worksheet5.o worksheet3.o
 Pacific-Sierra Research vf90 Personal   V3.4N5 15:12:10  12/ 7/00   f90 to f77  
    program    erf_time                        
[donev@pc346g-02 solutions]$ worksheet5.x
Enter: n_points and error: 5,1E-6
x=  0.00     time=   1.2     us
x=  1.12     time=   4.5     us
x=  2.25     time=   8.5     us
x=  3.38     time=   15.     us
x=  4.50     time=   25.     us
[donev@pc346g-02 solutions]$