autoconf: Require cython 3.0 for python bindings
diff --git a/configure.ac b/configure.ac
index 3c12010..9856ae2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -132,9 +132,9 @@
             [build_cython=false],
             [build_cython=true])
 if test "$build_cython" = "true"; then
-            AC_PROG_CYTHON([0.17.0])
+            AC_PROG_CYTHON([3.0.0])
             if [test "x$CYTHON" != "xfalse"]; then
-              AM_PATH_PYTHON([2.3], [
+              AM_PATH_PYTHON([3.0], [
                 CYTHON_PYTHON
                 AS_COMPILER_FLAG([-Wno-cast-function-type -Werror], [
                   CYTHON_CFLAGS+=" -Wno-cast-function-type"