Go on using Ml-lex

I would lile to re-compile and run some older programs which used 
Ml-lex.  I would like to continue using Ml-lex as it was, to check 
that the programs run correctly, before attempting a migration to 
Ml-ulex.

I downloaded 
http://smlnj.cs.uchicago.edu/dist/working/110.71/config.tgz,
unpacked and set config/targets to

request ml-lex
request ml-lex-mllex-tool
request ml-lex-lex-ext
request ml-yacc
request ml-yacc-grm-ext
request ml-lpt-lib
request smlnj-lib
request tdp-util

but config/install.sh ends with

[scanning $/json-lib.cm]
  [bad plugin name: anchor $ml-ulex-tool.cm not defined]
  FAILURE: unexpected exception: BadAnchor
  config/install.sh: !!! Installation of libraries and programs failed.

If I reduce config/targets to

request ml-lex
request ml-lex-mllex-tool
request ml-lex-lex-ext
request ml-yacc
request ml-yacc-grm-ext
request smlnj-lib

config/install.sh ends with

[scanning $/json-lib.cm]
  /usr/share/smlnj/smlnj-lib/JSON/json-lib.cm:22.3-22.18 Error: anchor
  $ml-lpt-lib.cm not defined
  FAILURE: unexpected exception: BadAnchor
  config/install.sh: !!! Installation of libraries and programs failed.

Is it possible to have ml-lex without ml-ulex?

Is Ml-ulex supposed to be a drop-in replacement for Ml-lex?

Roger

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