判断某个库是否存在
1. configure.ac
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AC_CHECK_LIB(udt, udt_listen, UDT_LIBS='-ludt', AC_MSG_ERROR([udt not found]))
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AC_SUBST(UDT_LIBS)
2. Makefile.am
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libspice_client_glib_2_0_la_LIBADD = \
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$(UDT_LIBS)
3. automake -> Makefile.in
autoconf -> configure
或者autoreconf -> Makefile.in configure
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