Update to color.sty breaks miniltx

[Daniel H. Luecking]

It seems a recent color.sty added \@backslashchar, which is not defined in miniltx.tex. This breaks the use of the color package in eplain.

Adding its latex definition to miniltx.tex corrects the problem.

Cheers,

Daniel H. Luecking [luecking at uark.edu]
Department of Mathematical Sciences
1 University of Arkansas
Fayetteville, AR, USA 72701-1201
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