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Only append sysroot to includedir / libdir, and not to other variables,
when a variable is requested (--variable=<name>), similar to how it
is done for the -I / -L flags in cflags/ldflags.
The problem is that pkg-config doesn't have any explicit cross compilation
support, so there's some confusion about what are host paths and what are
target ones. Includedir / libdir are paths for the (cross) compiler, so
those should normally have sysroot prepended, but other variables might
refer to target paths instead.
This fixes the installation of the xfonts-* packages, which uses
pkg-config --variable=fontrootdir fontutil to figure out the target
installation location for fonts.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
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