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Using AC_PATH_TOOL prefers ${CHOST}-prefixed tools over 'bare' ones, therefore improving support for cross-compilation and multilib. This is useful for environment where libgcrypt-config and xml2-config correspond to the build host environment, while ${CHOST}-libgcrypt-config and ${CHOST}-xml2-config are installed for each supported build targets. Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=725635 Fixes: https://bugs.gentoo.org/show_bug.cgi?id=518728
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