[Bug 40008] Detect telepathy-glib in right directory

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40008

--- Comment #1 from Stef Walter <stefw at collabora.co.uk> 2011-08-11 05:55:01 PDT ---
Created an attachment (id=50123)
 View: https://bugs.freedesktop.org/attachment.cgi?id=50123
 Review: https://bugs.freedesktop.org/review?bug=40008&attachment=50123

Ignore telepathy-glib installs in system when using another prefix

If using another build prefix PKG_CONFIG_PATH is set. This means that
pkg-config finds telepathy-glib.pc in the alternate prefix. However
if telepathy-glib is also installed, the cmake code then goes and uses
find_library/find_path, which by default use system directories.

Remove usage of system directories, in the case where the pkg-config file
is found.

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