diff -pruN 6.9.1-1/debian/changelog 6.9.1-2/debian/changelog
--- 6.9.1-1/debian/changelog	2025-07-24 20:24:37.000000000 +0000
+++ 6.9.1-2/debian/changelog	2025-08-23 13:06:43.000000000 +0000
@@ -1,3 +1,13 @@
+qt6-grpc (6.9.1-2) experimental; urgency=medium
+
+  [ Patrick Franz ]
+  * Do not use ccache on hurd.
+  * Fix FTCBFS, thx to Helmut Grohne (Closes: #1107996).
+    - Depend on a native build and instruct CMake to use it.
+    - Always build tools.
+
+ -- Patrick Franz <deltaone@debian.org>  Sat, 23 Aug 2025 15:06:43 +0200
+
 qt6-grpc (6.9.1-1) experimental; urgency=medium
 
   [ Patrick Franz ]
diff -pruN 6.9.1-1/debian/control 6.9.1-2/debian/control
--- 6.9.1-1/debian/control	2025-07-24 20:24:12.000000000 +0000
+++ 6.9.1-2/debian/control	2025-08-23 11:35:34.000000000 +0000
@@ -6,7 +6,7 @@ Uploaders: Patrick Franz <deltaone@debia
 Build-Depends: debhelper-compat (= 13),
                dh-sequence-pkgkde-symbolshelper,
                dh-sequence-qmldeps,
-               ccache,
+               ccache [linux-any],
                cmake (>= 3.24~),
                libgrpc++-dev,
                libprotobuf-c-dev,
@@ -20,6 +20,7 @@ Build-Depends: debhelper-compat (= 13),
                qt6-base-private-dev (>= 6.9.1+dfsg~),
                qt6-declarative-dev (>= 6.9.1+dfsg~),
                qt6-declarative-private-dev (>= 6.9.1+dfsg~),
+               qt6-grpc-dev:native <cross>,
 Build-Depends-Indep: qt6-base-dev (>= 6.9~) <!nodoc>,
                      qt6-documentation-tools (>= 6.9~) <!nodoc>,
 Standards-Version: 4.7.2
diff -pruN 6.9.1-1/debian/rules 6.9.1-2/debian/rules
--- 6.9.1-1/debian/rules	2025-02-07 23:10:52.000000000 +0000
+++ 6.9.1-2/debian/rules	2025-08-23 13:06:20.000000000 +0000
@@ -6,7 +6,7 @@ export DEB_BUILD_MAINT_OPTIONS = hardeni
 
 # cross-builds
 ifneq ($(DEB_BUILD_ARCH),$(DEB_HOST_ARCH))
-	extra_cmake_args += -DQT_HOST_PATH=/usr
+	extra_cmake_args += -DQT_HOST_PATH=/usr -DQT_HOST_PATH_CMAKE_DIR=/usr/lib/${DEB_BUILD_MULTIARCH}/cmake -DQT_FORCE_BUILD_TOOLS=ON
 endif
 
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