s4: Some patches to make the build work on older linux distributions

[Matthias Dieter Wallnöfer]

Recently I tested the build of s4 on a CentOS4 installation. The 
following two patches I had to apply to make the build work.

As stated in the commit comments the behaviour on newer distributions 
shouldn't break. Do you think that it's okay to apply this patches?

Matthias
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