the CSharp Extension was removed in grcp 1.47.0 [0] and the option in the CMakeLists was dropped in 1.58.0 [1], which means that it is no longer relevant since Buildroot commit91d1207de0, which bumped grpc from 1.51.1 to 1.66.1. So remove this option for host-grpc as well. Fixes: CMake Warning: Manually-specified variables were not used by the project: gRPC_BUILD_CSHARP_EXT [0] https://github.com/grpc/grpc/releases/tag/v1.47.0 [1]3a2bd221efSigned-off-by: Michael Nosthoff <buildroot@heine.tech> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> (cherry picked from commit e513d6a5fdf6b87eff10f759535ccc7abcef7a73) Signed-off-by: Thomas Perale <thomas.perale@mind.be>