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Ralf Habacker authored
Relocatable pkgconfig files are necessary when using packages installed to a location that does not match the location for which they were compiled. However, using ${pcfiledir} is problematic for system installations in standard locations, because it interferes with pkg-config's ability to filter out -I, -L options that are redundant with compiler defaults (which is important if you are trying to use a newer version of a library than the system copy). In practice operating system vendors installing dbus to standard locations use Autotools, so we enable relocatable builds by default when building with CMake. For simplicity, we're also not relocatable if the library directory is something more complicated than lib or lib64 (e.g. under Debian multiarch); we don't want to have to compute how many ../ to add. This is non-trivial to determine in an Autotools build, so for now there is no support for relocation when built with Autotools, even as an opt-in fe...
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