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AC_DEFUN([heroes_CHECK_SDL_MIXER],
[# don't even try to check for SDL_mixer if SDL is not installed
if test "${with_sdl-yes}" = no; then
with_sdl_mixer=no
fi # with_sdl
if test "${with_sdl_mixer-yes}" != no; then
if test "${with_sdl_mixer-no}" != no; then
user_selection_list_s="$user_selection_list_s sdls"
fi
# temporaly put the CFLAGS for SDL in CPPFLAGS
# so that AC_caolan_CHECK_PACKAGE can find SDL_mixer.h in the same directory.
tmp_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$SDL_CFLAGS $CPPFLAGS"
tmp_LIBS="$CPPLIBS"
LIBS="$SDL_LIBS $LIBS"
AC_caolan_CHECK_PACKAGE([SDL_mixer], [Mix_OpenAudio],
[SDL_mixer], [SDL_mixer.h],
[AC_DEFINE([HAVE_LIBSDL_MIXER], 1,
[Define if you have the SDL_mixer library installed.])],
[with_sdl_mixer=no])
# revert old value
CPPFLAGS="$tmp_CPPFLAGS"
LIBS="$tmp_LIBS"
fi # with_sdl_mixer
if test "x${with_sdl_mixer}" != xno; then
with_sdl_mixer=yes
$1
ifelse([$2],,,[else
$2])
fi # with_sdl_mixer
])
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