A more friendly build error on linux when packages are not found by pkg-config.
A more friendly build error on linux
when packages are not found by pkg-config.

Review URL: http://codereview.chromium.org/9618


git-svn-id: http://src.chromium.org/svn/trunk/src@4856 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 866d93470c407bec1ad8d1d7262cedf4f0d2be77
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser