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On some new distro like ubuntu21.04, unfs3-native compile failed with error: undefined reference to `xdr_uint32', since new distro has new glibc. >From glibc 2.27 rpc support is dropped, so unfs3 need to link to libtirpc. Here is defination of ac_link: ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' Depended library should be added into LIBS, not LDFLAGS, otherwise, gcc may not load the lib since it is before conftest.$ac_ext during configure. Finally, it results in compile failed. (From OE-Core rev: 27867862c1fee6c0e649286500fa1ab015d57faf) Signed-off-by: Changqing Li <changqing.li@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>