AC_SUBST([LIBVO_CFLAGS])AC_SUBST([LIBVO_LIBS])dnl check for X11AC_PATH_XTRAif test x"$no_x" != x"yes"; then    dnl check for Xshm    AC_CHECK_LIB([Xext],[XShmCreateImage],	[AC_DEFINE([LIBVO_X11],,[libvo X11 support])	LIBVO_CFLAGS="$LIBVO_CFLAGS $X_CFLAGS"	LIBVO_LIBS="$LIBVO_LIBS $X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS -lXext -lX11"	dnl check for Xv	AC_CHECK_LIB([Xv],[XvShmCreateImage],	    [AC_DEFINE([LIBVO_XV],,[libvo Xv support])	    LIBVO_LIBS="$LIBVO_LIBS -lXv"],,	    [$X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS -lXext -lX11])],,	[$X_PRE_LIBS $X_LIBS $X_EXTRA_LIBS -lX11])fidnl check for DirectXAC_ARG_ENABLE([directx],    [  --enable-directx=DIR    use Win32 DirectX headers in DIR])case $enable_directx in    ""|yes)	AC_CHECK_HEADER([ddraw.h],		    [AC_DEFINE([LIBVO_DX],,[libvo DirectX support])		    LIBVO_LIBS="$LIBVO_LIBS -lgdi32"]);;    no)		;;    *)		if test -f "$enable_directx/ddraw.h"; then		    AC_DEFINE([LIBVO_DX],,[libvo DirectX support])		    LIBVO_CFLAGS="$LIBVO_CFLAGS -I$enable_directx"		    LIBVO_LIBS="$LIBVO_LIBS -lgdi32"		else		    AC_MSG_ERROR([Cannot find $enable_directx/ddraw.h])		fi;;esacdnl check for SDLAC_ARG_ENABLE([sdl],[  --disable-sdl           make a version not using SDL])if test x"$enable_sdl" != x"no"; then    AC_CHECK_PROG([SDLCONFIG],[sdl-config],[yes])    if test x"$SDLCONFIG" = x"yes"; then	AC_DEFINE([LIBVO_SDL],,[libvo SDL support])	LIBVO_CFLAGS="$LIBVO_CFLAGS `sdl-config --cflags`"	LIBVO_LIBS="$LIBVO_LIBS `sdl-config --libs`"    fifi