Add commented-out ALSA auto-detection.

src/xpdev/GNUmakefile

@@ -7,6 +7,9 @@ endif
 MTOBJS	+=	$(MTOBJODIR)$(DIRSEP)xpevent$(OFILE)
 
 CFLAGS	+=	-DSOUNDCARD_H_IN=$(shell if [ -f /usr/include/sys/soundcard.h ] ; then echo 1 ; elif [ -f /usr/include/soundcard.h ] ; then echo 2 ; elif [ -f /usr/include/linux/soundcard.h ] ; then echo 3 ; else echo 0 ; fi) -I. $(XPDEV_CFLAGS)
+ifeq ($(shell if [ -f /usr/include/alsa/asoundlib.h ] ; then echo YES ; fi),YES)
+#	CFLAGS	+=	-DUSE_ALSA_SOUND
+endif
 MT_CFLAGS	+=	$(XPDEV-MT_CFLAGS)
 
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