-echo "# Automatically generated by configure - do not modify" > $config_host_mak
-printf "# Configured with:" >> $config_host_mak
-printf " '%s'" "$0" "$@" >> $config_host_mak
-echo >> $config_host_mak
+##########################################
+# Check whether we have TCP_NODELAY
+tcp_nodelay="no"
+cat > $TMPC << EOF
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/tcp.h>
+int main(int argc, char **argv)
+{
+ return getsockopt(0, 0, TCP_NODELAY, NULL, NULL);
+}
+EOF
+if compile_prog "" "" "TCP_NODELAY"; then
+ tcp_nodelay="yes"
+fi
+echo "TCP_NODELAY $tcp_nodelay"
+
+##########################################
+# Check whether we have RLIMIT_MEMLOCK
+rlimit_memlock="no"
+cat > $TMPC << EOF
+#include <sys/time.h>
+#include <sys/resource.h>
+int main(int argc, char **argv)
+{
+ struct rlimit rl;
+ return getrlimit(RLIMIT_MEMLOCK, &rl);
+}
+EOF
+if compile_prog "" "" "RLIMIT_MEMLOCK"; then
+ rlimit_memlock="yes"
+fi
+echo "RLIMIT_MEMLOCK $rlimit_memlock"
+
+##########################################
+# Check whether we have pwritev/preadv
+pwritev="no"
+cat > $TMPC << EOF
+#include <stdio.h>
+#include <sys/uio.h>
+int main(int argc, char **argv)
+{
+ return pwritev(0, NULL, 1, 0) + preadv(0, NULL, 1, 0);
+}
+EOF
+if compile_prog "" "" "pwritev"; then
+ pwritev="yes"
+fi
+echo "pwritev/preadv $pwritev"
+
+
+#############################################################################