M Makefile → Makefile

@@ -6,7 +6,9 @@ SOURCES = xyw.c xywasm.c xywrun.c devices/system.c devices/terminal.c devices/clock.c devices/file.c devices/beeper.c
 OBJS = xyw.o xywasm.o xywrun.o devices/system.o devices/terminal.o devices/clock.o devices/file.o devices/beeper.o
 
 UNAME_S := $(shell uname -s)
-HAVE_ALSA := $(shell echo '\#include <alsa/asoundlib.h>' | $(CC) -E - >/dev/null 2>&1 && echo 1)
+HAVE_ALSA := $(shell \
+    printf 'int main(void){return 0;}\n' | \
+    $(CC) -x c - -lasound -o /dev/null >/dev/null 2>&1 && echo 1)
 
 # beeper.c picks its audio backend at compile time via #ifdef, so the only
 # thing the Makefile needs to do is link the matching system library.