Okay, I got the problem resolved in the following way (thanks go to Clint
Leysath):
1. removed the tcltk++ directory that came with my ccp4 download
2. installed Activestate's tcltk 8.4.19.2 from
https://www.activestate.com/activetcl/downloads/
3. downloaded blt2.4z.tar.gz and the blt2.4z-patch-2 from
http://sourceforge.net/projects/blt/files/
4. unpacked blt2.4z.tar.gz and moved the patch file into the blt2.4z directory
5. patched the blt installation (patch -p1 -i blt2.4z-patch-2)
6. then reordered statements in blt2.4z/src/bltTree.c [this is detailed at
http://www.ccp4.ac.uk/ccp4i/install_tcltkblt.html under the heading
Compilation failure in bltTree on 64-bit machines]
7. configured the blt install (./configure --with-tcl=/path/to/ActiveTcl-8.4)
8. installed blt (make)
9. for some reason bltwish did not end up in /path/to/ActiveTcl-8.4/bin even
though the configure script said that is where it would be put, so I moved
it to /path/to/ActiveTcl-8.4/bin
10. edited 1 line in ccp4.setup-bash (setenv CCP4I_TCLTK
/path/to/ActiveTcl-8.4/bin/)
11. opened a new terminal window & ccp4i works
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