File site-config.README of Package site-config
site-config: Site Paths Configuration for autoconf Based configure Scripts ========================================================================== Site configuration for autoconf based configure scripts provides smart defaults for paths that are not specified. All autoconf based configure scripts will automatically resource site script using CONFIG_SITE environment variable. It works without any explicit user interaction. Currently implemented features: Automatic libdir setup to $exec_prefix/lib or $exec_prefix/lib64 ---------------------------------------------------------------- Depending on architecture, site script should correctly and automatically switch between lib and lib64 libdir. libexecdir setup to $exec_prefix/lib ------------------------------------ Upstream libexecdir defaults to $exec_prefix/libexec. This directory is not part of FHS 2.2, so we change it to $exec_prefix/lib (yes, it is correct to set it to $exec_prefix/lib even for bi-arch platforms). Most projects add package name to this path, so you most probably get what FHS 2.2 expects.