Forum OpenACS Q&A: Re: installation issues centos 6.4
It seems as if aolserver 4.5.2 requires now tcl 8.5, and you are using a tcl version that does not include the "in" operator. ... i see, "your version" is from the install script, which should be updated.
Just now, i've updated the versions of tcl, tcllib, libthread, xotcl, fixed the download link of tdom and a few further things. Please get an updated version from the same place and install again.