1 files changed, 6 insertions, 1 deletions
diff --git a/gr-trellis/src/examples/python/test_viterbi_equalization1.py b/gr-trellis/src/examples/python/test_viterbi_equalization1.py
index 16c130a78c..4421e370a4 100755
--- a/gr-trellis/src/examples/python/test_viterbi_equalization1.py
+++ b/gr-trellis/src/examples/python/test_viterbi_equalization1.py
@@ -2,13 +2,18 @@
 
 from gnuradio import gr
 from gnuradio import trellis, digital, filter
-from gnuradio import analog
 from gnuradio import eng_notation
 import math
 import sys
 import random
 import fsm_utils
 
+try:
+    from gnuradio import analog
+except ImportError:
+    sys.stderr.write("Error: Program requires gr-analog.\n")
+    sys.exit(1)
+
 def run_test (f,Kb,bitspersymbol,K,channel,modulation,dimensionality,tot_constellation,N0,seed):
     tb = gr.top_block ()
     L = len(channel)