AC_ARG_WITH(pkg-config-libdir,
[ --with-pkg-config-libdir=XXX use given directory for installing pc-files],
[PKG_CONFIG_LIBDIR=$withval],
AC_ARG_WITH(pkg-config-libdir,
[ --with-pkg-config-libdir=XXX use given directory for installing pc-files],
[PKG_CONFIG_LIBDIR=$withval],