In previous CCP4 releases CCP4/ccp4i/bin/loggraph used "bltwish"

exec $CCP4I_TCLTK/bltwish "$0" -- ${1+"$@"}

In 6.2.0 this has mutated to

exec $CCP4I_TCLTK/wish "$0" -- ${1+"$@"}

which doesn't work on our systems, see error below

I've fixed it by changing back to the previous exec bltwish, but does this new 
version work for other people? Should it work for me, and with what version of 
TCL?

(I look forward to replacing loggraph!) 

Phil

Error in startup script: can't find package BLT
   while executing
"package require BLT"
   (file "/public/xtal/CCP4/ccp4-64/ccp4-6.2.0-c5/ccp4i/bin/loggraph.tcl" line 
47)
   invoked from within
"source [file join $env(CCP4I_TOP) bin loggraph.tcl]"
   (file "/public/xtal/CCP4/ccp4-64/ccp4-6.2.0-c5/ccp4i/bin/loggraph" line 5)

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