File project.diff of Package mtxclient

--- mtxclient.spec.orig
+++ mtxclient.spec
@@ -28,7 +28,13 @@ URL:            https://github.com/Nheko
 Source0:        %{url}/archive/refs/tags/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 BuildRequires:  cmake >= 3.13
 BuildRequires:  fdupes
+
+%if 0%{?suse_version} < 1600
+BuildRequires:  gcc11-c++
+%else
 BuildRequires:  gcc-c++
+%endif
+
 BuildRequires:  libsodium-devel
 BuildRequires:  mpark-variant-devel
 BuildRequires:  ninja
@@ -88,6 +94,9 @@ Client API library for Matrix, built on
     -DUSE_BUNDLED_OPENSSL=OFF \
     -DASAN=OFF \
     -DCOVERAGE=OFF \
+%if 0%{?suse_version} < 1600
+    -DCMAKE_CXX_COMPILER=g++-11 \
+%endif
     -DIWYU=OFF
 %cmake_build