[Xcb] [PATCH] pkg-config: Add sysroot prefix

[Eric Anholt]

Daniel Stone <daniels at collabora.com> writes:

> xcb-proto's pkg-config file exports static file paths for where to find
> its Python files and the XML definitions.
>
> When used to discover cflags, library paths, etc, pkg-config will
> prepend ${PKG_CONFIG_SYSROOT_DIR}, if any, to those paths. This makes
> the use of a sysroot prefix transparent to users. However, since it
> doesn't know about paths in custom variables, it cannot automatically
> prefix this.
>
> Adding ${pc_sysrootdir} to these absolute paths makes the behaviour
> match, and XCB builds work out of the box in a sysroot.

Reviewed-by: Eric Anholt <eric at anholt.net>
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