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When cross-compiling (for example for aarch64 on x86), using AC_PATH_PROG to search for pkg-config will find the build architecture (x86) pkg-config, but what we want is the host architecture (aarch64) pkg-config. PKG_PROG_PKG_CONFIG does this correctly, by using AC_PATH_TOOL. Signed-off-by: Simon McVittie <smcv@debian.org>
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