Check whether res_init() really lives in libresolv.

On some platforms (Mac OS X for example), the res_init() function requires
linking with libresolv. On others (Linux, OpenBSD for example), res_init()
lives in libc.

diff --git a/configure.ac b/configure.ac
index 1b89280..9ed54a6 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -204,7 +204,7 @@ AC_CHECK_DECLS([freeaddrinfo, gai_strerror, getaddrinfo, getnameinfo],
   [], [], [#include "src/have.h"]
 )
 
-AC_CHECK_DECLS([res_init], [LIBS="$LIBS -lresolv"], [], [
+AC_CHECK_DECLS([res_init], [AC_CHECK_LIB(resolv, res_init)], [], [
   #include <netinet/in.h>
   #include <resolv.h>
 ])