Simon McVittie authored Aug 27, 2020 and Simon McVittie committed Aug 26, 2020

Traditional -config scripts are awkward for cross-compilation, multilib
systems (lib/lib64), and multiarch systems like Debian; only one copy
of the -config script can be in the PATH. As a result, some OS
distributions are starting to deprecate or even remove them.

pkg-config is designed to be a replacement for traditional -config
scripts, and is cross-compilation-friendly: the PKG_CHECK_MODULES macro
looks for an architecture-specific executable like
x86_64-linux-gnu-pkg-config, which can look in an architecture-specific
search path for library metadata, before falling back to a generic
pkg-config executable.

As a bonus, pkg-config also compares version numbers correctly
(see #2454).

libwmf having pkg-config metadata seems to be a relatively new thing,
so I've kept the -config script code path too, using it if pkg-config
does not find libwmf.

Bug-Debian: https://bugs.debian.org/956183


Signed-off-by: Simon McVittie <smcv@debian.org>