AC_SUBST(CARES_OBJ) AC_SUBST(CARES_LIBS) AC_SUBST(CARES_CFLAGS) AC_CHECK_HEADERS(ares.h, [AC_CHECK_LIB([cares], [ares_init], [ CARES_LIBS="-lcares" ], [AC_MSG_ERROR([No usable c-ares library found])])], [AC_MSG_ERROR([c-ares header files are not installed])] ) dnl Check if this particular version of c-ares supports parsing of SRV records AC_CHECK_LIB([cares], [ares_parse_srv_reply], [AC_DEFINE([HAVE_ARES_PARSE_SRV], 1, [Does c-ares support srv parsing?]) ], [ ares_build_srv=1 ] ) dnl Check if this particular version of c-ares supports parsing of TXT records AC_CHECK_LIB([cares], [ares_parse_txt_reply], [AC_DEFINE([HAVE_ARES_PARSE_TXT], 1, [Does c-ares support txt parsing?]) ], [ ares_build_txt=1 ] ) AM_CONDITIONAL(BUILD_ARES_PARSE_SRV, test x$ares_build_srv = x1) AM_CONDITIONAL(BUILD_ARES_PARSE_TXT, test x$ares_build_txt = x1)