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klayout-0.24-python-eval is outdated - it was provided before 0.24 was released initially. And your gcc installation looks pretty broken. It does not find the STL which is essential. Maybe C++ support is missing at all.
Have you tried simply installing the RPM from here: http://www.klayout.org/downloads/CentOS_6/klayout-0.24.9-1.1.x86_64.rpm?
If you still want to build it yourself: here is the list of packages I need to build on CentOS6: gcc gcc-c++ make qt qt-devel ruby ruby-devel python and python-devel.