Comment # 1 on bug 1234629 from Dr. Werner Fink

This is upstream as I do not use uname in the spec file ...

  sendmail-8.18.1/devtools/bin/Build


 if [ ! "$arch" -a ! "$os" -a ! "$rel" ]
 then
         arch=`uname -m | sed -e 's/ //g' -e 's/\//-/g'`
         os=`uname -s | sed -e 's/\//-/g' -e 's/ //g'`
         rel=`uname -r | sed -e 's/(/-/g' -e 's/)//g' -e 's/ //g'`
 fi

any *working* fix welcome