Fixed: libvirt/libvirt#3159 (master - 058b30b)

[Travis CI]

Build Update for libvirt/libvirt
-------------------------------------

Build: #3159
Status: Fixed

Duration: 39 mins and 12 secs
Commit: 058b30b (master)
Author: Andrea Bolognani
Message: ci: Fix handling of $PKG_CONFIG_LIBDIR

There are two environment variables that are baked into our
cross-compilation container images at build time, $CONFIGURE_OPTS
and $PKG_CONFIG_LIBDIR: the former contain the options necessary
to convince configure to perform a cross build rather than a
native one, and the latter is necessary so that pkg-config will
locate the .pc files for MinGW libraries. Container images that
are not intended for cross-compilation will not have either one
defined.

The problem is that, while an empty $CONFIGURE_OPTS is completely
harmless, setting $PKG_CONFIG_LIBDIR to an emtpy value will
result in pkg-config not looking in its default search path, thus
not finding any library, and subsequently breaking native builds.

To work around this issue, only pass $PKG_CONFIG_LIBDIR to sudo
when the value is set in the calling environment.

Fixes: 71517ae4db35c4dcc6c358d60d3a6d5da0615d39
Signed-off-by: Andrea Bolognani <abologna at redhat.com>

View the changeset: https://github.com/libvirt/libvirt/compare/c95656c995e9...058b30b3822f

View the full build log and details: https://travis-ci.org/libvirt/libvirt/builds/654442359?utm_medium=notification&utm_source=email

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