+PROGS_IF_TSEARCH=adnsresfilter
+
+echo $ac_n "checking for tsearch""... $ac_c" 1>&6
+echo "configure:1047: checking for tsearch" >&5
+if eval "test \"`echo '$''{'ac_cv_func_tsearch'+set}'`\" = set"; then
+ echo $ac_n "(cached) $ac_c" 1>&6
+else
+ cat > conftest.$ac_ext <<EOF
+#line 1052 "configure"
+#include "confdefs.h"
+/* System header to define __stub macros and hopefully few prototypes,
+ which can conflict with char tsearch(); below. */
+#include <assert.h>
+/* Override any gcc2 internal prototype to avoid an error. */
+/* We use char because int might match the return type of a gcc2
+ builtin and then its argument prototype would still apply. */
+char tsearch();
+
+int main() {
+
+/* The GNU C library defines this for functions which it implements
+ to always fail with ENOSYS. Some functions are actually named
+ something starting with __ and the normal name is an alias. */
+#if defined (__stub_tsearch) || defined (__stub___tsearch)
+choke me
+#else
+tsearch();
+#endif
+
+; return 0; }
+EOF
+if { (eval echo configure:1075: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest; then
+ rm -rf conftest*
+ eval "ac_cv_func_tsearch=yes"
+else
+ echo "configure: failed program was:" >&5
+ cat conftest.$ac_ext >&5
+ rm -rf conftest*
+ eval "ac_cv_func_tsearch=no"
+fi
+rm -f conftest*
+fi
+
+if eval "test \"`echo '$ac_cv_func_'tsearch`\" = yes"; then
+ echo "$ac_t""yes" 1>&6
+
+ PROGS_HAVE_TSEARCH=$PROGS_IF_TSEARCH
+
+else
+ echo "$ac_t""no" 1>&6
+
+ PROGS_HAVE_TSEARCH='';
+ echo "configure: warning: tsearch missing - not building client program(s) $PROGS_IF_TSEARCH" 1>&2
+
+fi
+
+