+########################################################################### libao
+OLD_CPPFLAGS="$CPPFLAGS"
+OLD_LD_FLAGS="$LDFLAGS"
+OLD_LIBS="$LIBS"
+
+have_ao="yes"
+AC_ARG_WITH(ao_headers, [AC_HELP_STRING(--with-ao-headers=dir,
+ [look for ao/ao.h also in dir])])
+if test -n "$with_ao_headers"; then
+ ao_cppflags="-I$with_ao_headers"
+ CPPFLAGS="$CPPFLAGS $ao_cppflags"
+fi
+AC_ARG_WITH(ao_libs, [AC_HELP_STRING(--with-ao-libs=dir,
+ [look for libao also in dir])])
+if test -n "$with_ao_libs"; then
+ ao_libs="-L$with_ao_libs"
+ LDFLAGS="$LDFLAGS $ao_libs"
+fi
+msg="no libao support for para_audiod/para_write"
+AC_CHECK_HEADERS([ao/ao.h], [
+ ], [
+ have_ao="no"
+ AC_MSG_WARN([ao.h not found, $msg])
+])
+if test "$have_ao" = "yes"; then
+ AC_CHECK_LIB([ao], [ao_initialize], [], [
+ have_ao="no"
+ AC_MSG_WARN([ao lib not found or not working, $msg])
+ ])
+fi
+if test "$have_ao" = "yes"; then
+ AC_CHECK_HEADERS([pthread.h], [
+ ], [
+ have_ao="no"
+ AC_MSG_WARN([pthread.h not found, $msg])
+ ])
+fi
+if test "$have_ao" = "yes"; then
+ AC_CHECK_LIB([pthread], [pthread_create], [], [
+ have_ao="no"
+ AC_MSG_WARN([pthread lib not found or not working, $msg])
+ ])
+fi
+if test "$have_ao" = "yes"; then
+ all_errlist_objs="$all_errlist_objs ao_write"
+ audiod_errlist_objs="$audiod_errlist_objs ao_write"
+ audiod_cmdline_objs="$audiod_cmdline_objs add_cmdline(ao_write)"
+ audiod_ldflags="$audiod_ldflags -lao -lpthread"
+
+ write_errlist_objs="$write_errlist_objs ao_write"
+ write_cmdline_objs="$write_cmdline_objs add_cmdline(ao_write)"
+ write_ldflags="$write_ldflags $ao_libs -lao -lpthread"
+ writers="$writers ao"
+ AC_SUBST(ao_cppflags)
+fi
+
+CPPFLAGS="$OLD_CPPFLAGS"
+LDFLAGS="$OLD_LDFLAGS"
+LIBS="$OLD_LIBS"
+
+