[GRASSLIST:4190] repair unclosed vector areas?

[Otto Dassau]

Dear List, 

I imported vector data with v.in.arc and v.support 
gives a hundred unclosed areas.

Unclosed area, free end or edge inside area: line 3
Unclosed area, free end or edge inside area: line 19
Unclosed area, free end or edge inside area: line 27
Unclosed area, free end or edge inside area: line 28
...
Unclosed area, free end or edge inside area: line 325
Unclosed area, free end or edge inside area: line 326
Unclosed area, free end or edge inside area: line 328

Can I fix this somehow? Is there a common way to deal 
with this problem?

thanks
  Otto