--- a/configure.in
+++ b/configure.in
@@ -5830,24 +5830,20 @@ if test -n "$MOZ_TREMOR"; then
     AC_DEFINE(MOZ_TREMOR)
 fi
 
 dnl ========================================================
 dnl = Check alsa availability on Linux if using sydneyaudio
 dnl ========================================================
 
 dnl If using sydneyaudio with Linux, ensure that the alsa library is available
-if test -n "$MOZ_SYDNEYAUDIO"; then
-   case "$target_os" in
-linux*)
-      PKG_CHECK_MODULES(MOZ_ALSA, alsa, ,
+if test -n "$MOZ_SYDNEYAUDIO" -a "$OS_TARGET" = "Linux"; then
+    PKG_CHECK_MODULES(MOZ_ALSA, alsa, ,
          [echo "$MOZ_ALSA_PKG_ERRORS"
           AC_MSG_ERROR([Need alsa for Ogg, Wave or WebM decoding on Linux.  Disable with --disable-ogg --disable-wave --disable-webm.  (On Ubuntu, you might try installing the package libasound2-dev.)])])
-      ;;
-   esac
 fi
 
 dnl ========================================================
 dnl = Enable GStreamer
 dnl ========================================================
 MOZ_ARG_ENABLE_BOOL(gstreamer,
 [  --enable-gstreamer           Enable GStreamer support],
 MOZ_GSTREAMER=1,