if test "x$have_libclc" = xno; then
        AC_MSG_ERROR([pkg-config cannot find libclc.pc which is required to build clover.
                    Make sure the directory containing libclc.pc is specified in your
                    PKG_CONFIG_PATH environment variable.
                    By default libclc.pc is installed to /usr/local/share/pkgconfig/])
    else
        LIBCLC_INCLUDEDIR=`$PKG_CONFIG --variable=includedir libclc`
        LIBCLC_LIBEXECDIR=`$PKG_CONFIG --variable=libexecdir libclc`
        AC_SUBST([LIBCLC_INCLUDEDIR])
        AC_SUBST([LIBCLC_LIBEXECDIR])
    fi