Makefile: do not fail if sox is not installed

diff --git a/Makefile b/Makefile
index a3b9df4..af85bb5 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -60,10 +60,10 @@ help:
        $(WAFCMD) --help
 
 create_test_sounds:
-       [ -z `which $(SOX)` ] && ( echo $(SOX) could not be found; false ) || true
-       mkdir -p $(TESTSOUNDS)
-       $(SOX) -r 44100 -n $(TESTSOUNDS)/44100Hz_1f_silence.wav synth 1s silence 0
-       $(SOX) -r  8000 -n $(TESTSOUNDS)/8000Hz_30s_silence.wav synth 30 silence 0
-       $(SOX) -r 32000 -n $(TESTSOUNDS)/32000Hz_127f_sine440.wav synth 127 sine 440
-       $(SOX) -r 22050 -n $(TESTSOUNDS)/22050Hz_5s_brownnoise.wav synth 5 brownnoise
-       $(SOX) -r 48000 -n $(TESTSOUNDS)/48000Hz_60s_sweep.wav synth 60 sine 200-24000
+       -[ -z `which $(SOX)` ] && ( echo $(SOX) could not be found) || true
+       -mkdir -p $(TESTSOUNDS)
+       -$(SOX) -r 44100 -n $(TESTSOUNDS)/44100Hz_1f_silence.wav synth 1s silence 0
+       -$(SOX) -r  8000 -n $(TESTSOUNDS)/8000Hz_30s_silence.wav synth 30 silence 0
+       -$(SOX) -r 32000 -n $(TESTSOUNDS)/32000Hz_127f_sine440.wav synth 127 sine 440
+       -$(SOX) -r 22050 -n $(TESTSOUNDS)/22050Hz_5s_brownnoise.wav synth 5 brownnoise
+       -$(SOX) -r 48000 -n $(TESTSOUNDS)/48000Hz_60s_sweep.wav synth 60 sine 200-24000