CMake Error at CMakeLists.txt:389 (add_subdirectory):
  add_subdirectory given source "create-hardfork" which is not an existing directory.

[ 55%] Building CXX object tddb/CMakeFiles/tddb.dir/td/db/RocksDb.cpp.o
/home/ton-node/tddb/td/db/RocksDb.cpp: In static member function ‘static td::Result<td::RocksDb> td::RocksDb::open(std::__cxx11::string)’:
/home/ton-node/tddb/td/db/RocksDb.cpp:81:14: error: ‘OptimisticTransactionDBOptions’ is not a member of ‘rocksdb’
     rocksdb::OptimisticTransactionDBOptions occ_options;
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ton-node/tddb/td/db/RocksDb.cpp:81:14: note: suggested alternative: ‘OptimisticTransactionOptions’
     rocksdb::OptimisticTransactionDBOptions occ_options;
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
              OptimisticTransactionOptions
/home/ton-node/tddb/td/db/RocksDb.cpp:82:5: error: ‘occ_options’ was not declared in this scope
     occ_options.validate_policy = rocksdb::OccValidationPolicy::kValidateSerial;
     ^~~~~~~~~~~
/home/ton-node/tddb/td/db/RocksDb.cpp:82:5: note: suggested alternative: ‘log_options’
     occ_options.validate_policy = rocksdb::OccValidationPolicy::kValidateSerial;
     ^~~~~~~~~~~
     log_options
/home/ton-node/tddb/td/db/RocksDb.cpp:82:44: error: ‘rocksdb::OccValidationPolicy’ has not been declared
     occ_options.validate_policy = rocksdb::OccValidationPolicy::kValidateSerial;
                                            ^~~~~~~~~~~~~~~~~~~
tddb/CMakeFiles/tddb.dir/build.make:278: recipe for target 'tddb/CMakeFiles/tddb.dir/td/db/RocksDb.cpp.o' failed
make[2]: *** [tddb/CMakeFiles/tddb.dir/td/db/RocksDb.cpp.o] Error 1

git submodule update
Submodule path 'third-party/abseil-cpp': checked out 'df3ea785d8c30a9503321a3d35ee7d35808f190d'
Submodule path 'third-party/rocksdb': checked out '0915c99f01b46f50af8e02da8b6528156f584b7c'

Add abseil-cpp
-- No CMAKE_CXX_STANDARD set, assuming 11
CMake Error: Target absl_flags_handle has dependency information when it shouldn't.
Your cache is probably stale. Please remove the entry
  absl_flags_handle_LIB_DEPENDS
from the cache.
Add crc32c
Add rocksdb
CMake Error at /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  Could NOT find gflags (missing: GFLAGS_LIBRARIES GFLAGS_INCLUDE_DIR)
Call Stack (most recent call first):
  /usr/share/cmake-3.10/Modules/FindPackageHandleStandardArgs.cmake:378 (_FPHSA_FAILURE_MESSAGE)
  third-party/rocksdb/cmake/modules/Findgflags.cmake:15 (find_package_handle_standard_args)
  third-party/rocksdb/CMakeLists.txt:108 (find_package)


-- Configuring incomplete, errors occurred!