Compilation on galaxy s10+ Android 9 Pie via makefile error

I ran the build command on the master branch
```
PORTABLE=1 DEBUG_LEVEL=0 make shared_lib install-shared
```

Error traceback output log
```
CC shared-objects/db/transaction_log_impl.o CC shared-objects/db/version_builder.o CC shared-objects/db/version_edit.o CC shared-objects/db/version_set.o CC shared-objects/db/wal_manager.o CC shared-objects/db/write_batch.o CC shared-objects/db/write_batch_base.o CC shared-objects/db/write_controller.o CC shared-objects/db/write_thread.o
CC shared-objects/env/env.o
CC shared-objects/env/env_chroot.o
CC shared-objects/env/env_encryption.o
CC shared-objects/env/env_hdfs.o CC shared-objects/env/env_posix.o
CC shared-objects/env/io_posix.o
env/io_posix.cc:164:9: error: use of undeclared identifier 'fread_unlocked' r = fread_unlocked(scratch, 1, n, file_);
^ 1 error generated. make: *** [Makefile:621: shared-objects/env/io_posix.o] Error 1
```