Manual backport of upstream commit:
https://github.com/PowerDNS/pdns/commit/661b071b347193a66deaa0d5b8350a2c816f6534

Signed-off-by: Holger Hoffstätte <holger@applied-asynchrony.com>

diff -up dnsdist-1.9.8/doh3.cc.orig dnsdist-1.9.8/doh3.cc 
--- dnsdist-1.9.8/doh3.cc.orig	2024-12-17 10:14:37.000000000 +0100
+++ dnsdist-1.9.8/doh3.cc	2025-02-18 10:04:11.843950262 +0100
@@ -751,7 +751,11 @@ static void processH3HeaderEvent(ClientS
   }
 
   if (headers.at(":method") == "POST") {
+#if defined(HAVE_QUICHE_H3_EVENT_HEADERS_HAS_MORE_FRAMES)
+    if (!quiche_h3_event_headers_has_more_frames(event)) {
+#else
     if (!quiche_h3_event_headers_has_body(event)) {
+#endif
       handleImmediateError("Empty POST query");
     }
     return;
diff -up dnsdist-1.9.8/m4/pdns_with_quiche.m4.orig dnsdist-1.9.8/m4/pdns_with_quiche.m4 
--- dnsdist-1.9.8/m4/pdns_with_quiche.m4.orig	2024-12-17 10:14:37.000000000 +0100
+++ dnsdist-1.9.8/m4/pdns_with_quiche.m4	2025-02-18 10:04:11.844114375 +0100
@@ -10,16 +10,23 @@ AC_DEFUN([PDNS_WITH_QUICHE], [
 
   AS_IF([test "x$with_quiche" != "xno"], [
     AS_IF([test "x$with_quiche" = "xyes" -o "x$with_quiche" = "xauto"], [
-      PKG_CHECK_MODULES([QUICHE], [quiche >= 0.22.0], [
+      PKG_CHECK_MODULES([QUICHE], [quiche >= 0.23.0], [
         [HAVE_QUICHE=1]
         AC_DEFINE([HAVE_QUICHE], [1], [Define to 1 if you have quiche])
+        AC_DEFINE([HAVE_QUICHE_H3_EVENT_HEADERS_HAS_MORE_FRAMES], [1], [Define to 1 if the Quiche API has quiche_h3_event_headers_has_more_frames instead of quiche_h3_event_headers_has_body])
         AC_DEFINE([HAVE_QUICHE_STREAM_ERROR_CODES], [1], [Define to 1 if the Quiche API includes error code in quiche_conn_stream_recv and quiche_conn_stream_send])
       ], [
-        # Quiche is older than 0.22.0, or no Quiche at all
-        PKG_CHECK_MODULES([QUICHE], [quiche >= 0.15.0], [
+        PKG_CHECK_MODULES([QUICHE], [quiche >= 0.22.0], [
           [HAVE_QUICHE=1]
           AC_DEFINE([HAVE_QUICHE], [1], [Define to 1 if you have quiche])
-        ], [ : ])
+          AC_DEFINE([HAVE_QUICHE_STREAM_ERROR_CODES], [1], [Define to 1 if the Quiche API includes error code in quiche_conn_stream_recv and quiche_conn_stream_send])
+        ], [
+          # Quiche is older than 0.22.0, or no Quiche at all
+          PKG_CHECK_MODULES([QUICHE], [quiche >= 0.15.0], [
+            [HAVE_QUICHE=1]
+            AC_DEFINE([HAVE_QUICHE], [1], [Define to 1 if you have quiche])
+          ], [ : ])
+        ])
       ])
     ])
   ])