Thanks a lot, I have implemented the configure stuff and it works perfectly
!!
Exactly what I was looking for.

I just added AC_PREREQ([2.62]) because the AC_OPENMP was only supported from
this version, and
 AC_MSG_WARN([NO OpenMP support detected. You should should use gcc >= 4.2
!!!])
when no openmp support was detected.

Maybe this could be put into the Writing R Extensions manual.

Thanks again,

Karl

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