diff --git a/aegisub/Makefile.inc.in b/aegisub/Makefile.inc.in
index 12c789efb..c80c1d567 100644
--- a/aegisub/Makefile.inc.in
+++ b/aegisub/Makefile.inc.in
@@ -96,6 +96,7 @@ CFLAGS_LIBCURL     = @LIBCURL_CFLAGS@
 CFLAGS_LIBPULSE    = @LIBPULSE_CFLAGS@
 CFLAGS_LUA         = @LUA_CFLAGS@
 CFLAGS_OPENAL      = @OPENAL_CFLAGS@
+CFLAGS_OSS         = @OSS_CFLAGS@
 CFLAGS_PORTAUDIO   = @PORTAUDIO_CFLAGS@
 CFLAGS_PTHREAD     = @PTHREAD_CFLAGS@
 CFLAGS_UCHARDET    = -I../universalchardet
diff --git a/aegisub/configure.in b/aegisub/configure.in
index b63f54854..235df2d21 100644
--- a/aegisub/configure.in
+++ b/aegisub/configure.in
@@ -423,17 +423,17 @@ AC_SUBST(with_openal)
 ######
 ## OSS
 ######
+AC_ARG_VAR([OSS_CFLAGS], [CFLAGS to use for OSS [auto]])
 AC_ARG_WITH(oss,
             AS_HELP_STRING([--without-oss],
                            [build without OSS audio provider [auto]]))
 
 AS_IF([test x$with_oss = xno], [oss_disabled="(disabled)"], [
-  AS_IF([test -f "/etc/oss.conf"], [
+  AS_IF([test -z "$OSS_CFLAGS" && test -f "/etc/oss.conf"], [
     . /etc/oss.conf
-    CPPFLAGS="$CPPFLAGS -I${OSSLIBDIR}/include/sys"
+    OSS_CFLAGS="-I${OSSLIBDIR}/include/sys"
   ])
   AC_CHECK_HEADERS([soundcard.h sys/soundcard.h], [with_oss="yes"], [with_oss="no"])
-  # XXX: maybe check if OSS works
 ])
 
 AS_IF([test x$with_oss = xyes], AC_DEFINE(WITH_OSS, 1, [Enable OSS support]))
diff --git a/aegisub/src/Makefile b/aegisub/src/Makefile
index 17fa02398..81c964551 100644
--- a/aegisub/src/Makefile
+++ b/aegisub/src/Makefile
@@ -51,6 +51,7 @@ endif
 
 ifeq (yes, $(HAVE_OSS))
 SRC_OPT += audio_player_oss.cpp
+audio_player_oss.o: CXXFLAGS += $(CFLAGS_OSS)
 endif
 
 #######################