+AC_SUBST(ASOUNDLIB_LIBS)
+AC_SUBST(HAVE_ALSA)
+AM_CONDITIONAL([HAVE_ALSA], [test "x$HAVE_ALSA" = x1])
+
+PKG_CHECK_MODULES(GLIB20, [ glib-2.0 >= 2.4.0 ], HAVE_GLIB20=1, HAVE_GLIB20=0)
+AC_SUBST(GLIB20_CFLAGS)
+AC_SUBST(GLIB20_LIBS)
+AC_SUBST(HAVE_GLIB20)
+AM_CONDITIONAL([HAVE_GLIB20], [test "x$HAVE_GLIB20" = x1])
+
+PKG_CHECK_MODULES(GLIB12, [ glib >= 1.2.0 ], HAVE_GLIB12=1, HAVE_GLIB12=0)
+AC_SUBST(GLIB12_CFLAGS)
+AC_SUBST(GLIB12_LIBS)
+AC_SUBST(HAVE_GLIB12)
+AM_CONDITIONAL([HAVE_GLIB12], [test "x$HAVE_GLIB12" = x1])
+
+AC_PATH_PROG([M4], [m4 gm4], [no])
+if test "x$M4" = xno ; then
+ AC_MSG_ERROR([m4 missing])
+fi