in reply to Re: libapreq2: libtool: link: CURRENT `' must be a nonnegative integer (grep)
in thread libapreq2: libtool: link: CURRENT `' must be a nonnegative integer

Appears its https://metacpan.org/source/ISAAC/libapreq2-2.13/ltmain.sh that does the version checking 
$echo "$modename: \`$vinfo' is not valid version information"

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You'll probably have to fixup $current (wherever it comes from), so its something that ltmain.sh expects

much simpler idea than hacking ltmain.sh

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