--- configure.ac.orig	2015-03-02 23:54:36.000000000 +0100
+++ configure.ac	2017-12-18 17:23:45.215876000 +0100
@@ -86,14 +86,15 @@ fi
 if test "x${notify}" = xyes; then
 # Check for libnotify
 PKG_CHECK_MODULES([NOTIFY], [libnotify >= 0.5.0])
-NOTIFY_CFLAGS+="-DCOMPILEWITH_NOTIFY"
+NOTIFY_CFLAGS="-DCOMPILEWITH_NOTIFY"
 AC_SUBST(NOTIFY_CFLAGS)
 AC_SUBST(NOTIFY_LIBS)
 fi
 
 AC_SUBST(OSS_CFLAGS)
 
-AM_CONDITIONAL(ENABLE_OSS, test "$oss" = "yes")
+AM_CONDITIONAL(ENABLE_OSS4, test "x${oss}" = xyes -o "x${oss}" = xv4)
+AM_CONDITIONAL(ENABLE_OSS3, test "x${oss}" = xv3)
 
 DEFAULT_MIXERAPP="xterm -e 'alsamixer'"
 AC_ARG_WITH(default-mixerapp,