diff --git a/pkgs/by-name/or/or-tools/package.nix b/pkgs/by-name/or/or-tools/package.nix
index abe374ea642f..90754354a478 100644
--- a/pkgs/by-name/or/or-tools/package.nix
+++ b/pkgs/by-name/or/or-tools/package.nix
@@ -206,6 +206,12 @@ stdenv.mkDerivation (finalAttrs: {
     export LD_LIBRARY_PATH=$LD_LIBRARY_PATH''${LD_LIBRARY_PATH:+:}$PWD/lib
   '';
 
+  checkPhase = ''
+    runHook preCheck
+    ctest --output-on-failure -E "python_math_opt_.*"
+    runHook postCheck
+  '';
+
   # This extra configure step prevents the installer from littering
   # $out/bin with sample programs that only really function as tests,
   # and disables the upstream installation of a zipped Python egg that
diff --git a/pkgs/by-name/or/or-tools/pybind11-protobuf.nix b/pkgs/by-name/or/or-tools/pybind11-protobuf.nix
index 32947bbc038f..6e4df8b78a37 100644
--- a/pkgs/by-name/or/or-tools/pybind11-protobuf.nix
+++ b/pkgs/by-name/or/or-tools/pybind11-protobuf.nix
@@ -29,8 +29,15 @@ buildPythonPackage {
   ];
 
   postPatch = ''
+    # Original fix for version pinning
     substituteInPlace cmake/dependencies/CMakeLists.txt \
       --replace-fail 'find_package(protobuf 5.29.2 REQUIRED)' 'find_package(protobuf REQUIRED)'
+
+    # Fix for Protobuf 34.0 (absl::string_view migration)
+    substituteInPlace pybind11_protobuf/proto_cast_util.cc \
+      --replace-fail "const std::string& filename" "absl::string_view filename" \
+      --replace-fail "const std::string& symbol_name" "absl::string_view symbol_name" \
+      --replace-fail "const std::string& containing_type" "absl::string_view containing_type"
   '';
 
   nativeBuildInputs = [ cmake ];