mksandbox errors

[Jason Bacon <bacon4000%gmail.com@localhost>]

I'm playing with mksandbox on CentOS, 2017Q1 tree.

It's giving me a bunch of mount usage errors, which I traced to bmake 
show-var producing two lines of output where I believe it should only 
produce one:

Linux centosdev.local  bacon ~/Pkgsrc/pkgsrc-2017Q1/pkgtools/lintpkgsrc 
411: (pkgsrc): bmake show-var VARNAME=PACKAGES
/home/bacon/Pkgsrc/pkgsrc-2017Q1/pkgtools/lintpkgsrc
/home/bacon/Pkgsrc/pkgsrc-2017Q1/packages

The causes mount --bind commands to have 4 arguments instead of the 
required 2.  I got mksandbox to run without errors by adding "| tail -n 
1" wherever show-var is used.

Anyone seen this before?

Thanks,

    Jason

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