--- configure.ac	(Asterisk 13.20)
+++ configure.ac	(working copy)
@@ -1414 +1414,4 @@
-AST_EXT_LIB_CHECK([ALSA], [asound], [snd_spcm_init], [alsa/asoundlib.h], [-lm -ldl])
+AST_EXT_LIB_CHECK([ALSA], [asound], [snd_pcm_open], [alsa/asoundlib.h])
+if test "${PBX_ALSA}" = "0"; then
+  AST_EXT_LIB_CHECK([ALSA], [asound], [snd_pcm_open], [alsa/asoundlib.h], [-lm -ldl])
+fi
--- channels/chan_alsa.c	(Asterisk 13.20)
+++ channels/chan_alsa.c	(working copy)
@@ -43,2 +43,6 @@
 
+#include <errno.h>
+#ifndef ESTRPIPE
+#define ESTRPIPE EPIPE
+#endif
 #include <fcntl.h>