diff --git a/Makefile b/Makefile
index ea3b700..ba6379d 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,8 @@ PROG= lm
 ifdef USE_X11
 OBJS += display.o
 LDFLAGS += -L/usr/X11R6/lib -lX11
+else
+OBJS += nodisplay.o
 endif
 
 all: $(PROG) 
diff --git a/nodisplay.c b/nodisplay.c
new file mode 100644
index 0000000..716496c
--- /dev/null
+++ b/nodisplay.c
@@ -0,0 +1,49 @@
+/*
+ * Stubs for X11 interface for linmodem
+ *
+ * Copyright (c) 2000 Fabrice Bellard, 2014 Geoffrey Thomas
+ *
+ * This code is released under the GNU General Public License version
+ * 2. Please read the file COPYING to know the exact terms of the
+ * license.
+ */
+
+#include "lm.h"
+
+int lm_display_init(void)
+{
+    return 0;
+}
+
+void lm_display_close(void)
+{
+}
+
+void lm_dump_qam(float si, float sq)
+{
+}
+
+void draw_samples(int channel)
+{
+}
+
+void lm_dump_sample(int channel, float val)
+{
+}
+
+void lm_dump_equalizer(s32 eq_filter1[][2], int norm, int size)
+{
+}
+
+void lm_dump_agc(float gain)
+{
+}
+
+void lm_dump_linesim_power(float tx_db, float rx_db, float noise_db)
+{
+}
+
+int lm_display_poll_event(void)
+{
+    return 0;
+}