pkg/54420: pkgsrc (wrappers?) break libtool -dlopen

[prlw1%cam.ac.uk@localhost]

>Number:         54420
>Category:       pkg
>Synopsis:       pkgsrc (wrappers?) break libtool -dlopen
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jul 29 14:30:01 +0000 2019
>Originator:     Patrick Welche
>Release:        NetBSD-8.99.51/amd64 & today's pkgsrc
>Organization:
>Environment:
>Description:
(Not a new problem though)

In essence

  libtool --mode=relink -dlopen some.la

gets rewritten to

  libtool --mode=relink -dlopen -Lsomepath some.la

at which point libtool complains that -dlopen hasn't been handed an argument.
>How-To-Repeat:
Try to update security/clamav to e.g. version 0.101.2
>Fix:
My guess is that pkgtools/cwrappers/files/bin/fixup-libtool.c:process_option() might be a good place to look.

(For clamav, build from source outside of pkgsrc framework.)