auto-detect res_search() for Kerberos helpers

From libc6 2.2 res_init which we were looking for is located in libc
but res_search is only located in libresolv.

diff --git a/configure.ac b/configure.ac
index be89677fc658652ecd228f8f70576914a7c97706..1656f4c78f2581845af1fc1467f367455ec312d1 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1821,6 +1821,9 @@ if test x"$krb5confpath" != "xno"; then
     fi
 fi
 if test "x$ac_krb5_config" = "xyes" ; then
+  # Kerberos helpers use res_search() from libresolv or libc
+  AC_SEARCH_LIBS([__res_search],[resolv])
+
   ac_heimdal="`$krb5confpath --version 2>/dev/null | grep -i heimdal`"
   ac_solaris="`$krb5confpath --version 2>/dev/null | grep -i solaris`"
   if test "x$ac_heimdal" != "x" ; then