Tried again on 32-bit f8 using system tcl/tk (had to install tcl,
tcl-dev, tk, tk-dev, itcl, itcl-dev, itk, itk-dev and iwidgets packages
from old f8 repo). Even configured with --with-itcl=/usr/lib it
complained that it needed env vars ITCL_LIBRARY and ITK_LIBRARY pointing
to the respective libraries. Expected to find itcll3.3/ and itk3.3/ in
/usr/share/ so made symlink to them rather than define them (yum put
them in /usr/lib like everything else tcl/tk related).
Once this was resolved still would not step properly in arm code.
Changed loading my elf file with "symbol-file" to "file" command in
gdbinit fixed it. So now running "7.1.50.20100407-cvs" OK. This would
probably also fix case above using insight's own tcl/tk (haven't tried it).