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+## Compilation
+
+**Important**: If you plan to run RocksDB in production, don't compile using default
+`make` or `make all`. That will compile RocksDB in debug mode, which is much slower
+than release mode.
+
+RocksDB's library should be able to compile without any dependency installed,
+although we recommend installing some compression libraries (see below).
+We do depend on newer gcc/clang with C++17 support (GCC >= 7, Clang >= 5).
+
+There are few options when compiling RocksDB:
+
+* [recommended] `make static_lib` will compile librocksdb.a, RocksDB static library. Compiles static library in release mode.
+
+* `make shared_lib` will compile librocksdb.so, RocksDB shared library. Compiles shared library in release mode.
+
+* `make check` will compile and run all the unit tests. `make check` will compile RocksDB in debug mode.
+
+* `make all` will compile our static library, and all our tools and unit tests. Our tools
+depend on gflags. You will need to have gflags installed to run `make all`. This will compile RocksDB in debug mode. Don't
+use binaries compiled by `make all` in production.
+
+* By default the binary we produce is optimized for the platform you're compiling on
+(`-march=native` or the equivalent). SSE4.2 will thus be enabled automatically if your
+CPU supports it. To print a warning if your CPU does not support SSE4.2, build with
+`USE_SSE=1 make static_lib` or, if using CMake, `cmake -DFORCE_SSE42=ON`. If you want
+to build a portable binary, add `PORTABLE=1` before your make commands, like this:
+`PORTABLE=1 make static_lib`.
+
+## Dependencies
+
+* You can link RocksDB with following compression libraries:
+ - [zlib](http://www.zlib.net/) - a library for data compression.
+ - [bzip2](http://www.bzip.org/) - a library for data compression.
+ - [lz4](https://github.com/lz4/lz4) - a library for extremely fast data compression.
+ - [snappy](http://google.github.io/snappy/) - a library for fast
+ data compression.
+ - [zstandard](http://www.zstd.net) - Fast real-time compression
+ algorithm.
+
+* All our tools depend on:
+ - [gflags](https://gflags.github.io/gflags/) - a library that handles
+ command line flags processing. You can compile rocksdb library even
+ if you don't have gflags installed.
+
+* `make check` will also check code formatting, which requires [clang-format](https://clang.llvm.org/docs/ClangFormat.html)
+
+* If you wish to build the RocksJava static target, then cmake is required for building Snappy.
+
+* If you wish to run microbench (e.g, `make microbench`, `make ribbon_bench` or `cmake -DWITH_BENCHMARK=1`), Google benchmark >= 1.6.0 is needed.
+
+## Supported platforms
+
+* **Linux - Ubuntu**
+ * Upgrade your gcc to version at least 7 to get C++17 support.
+ * Install gflags. First, try: `sudo apt-get install libgflags-dev`
+ If this doesn't work and you're using Ubuntu, here's a nice tutorial:
+ (http://askubuntu.com/questions/312173/installing-gflags-12-04)
+ * Install snappy. This is usually as easy as:
+ `sudo apt-get install libsnappy-dev`.
+ * Install zlib. Try: `sudo apt-get install zlib1g-dev`.
+ * Install bzip2: `sudo apt-get install libbz2-dev`.
+ * Install lz4: `sudo apt-get install liblz4-dev`.
+ * Install zstandard: `sudo apt-get install libzstd-dev`.
+
+* **Linux - CentOS / RHEL**
+ * Upgrade your gcc to version at least 7 to get C++17 support
+ * Install gflags:
+
+ git clone https://github.com/gflags/gflags.git
+ cd gflags
+ git checkout v2.0
+ ./configure && make && sudo make install
+
+ **Notice**: Once installed, please add the include path for gflags to your `CPATH` environment variable and the
+ lib path to `LIBRARY_PATH`. If installed with default settings, the include path will be `/usr/local/include`
+ and the lib path will be `/usr/local/lib`.
+
+ * Install snappy:
+
+ sudo yum install snappy snappy-devel
+
+ * Install zlib:
+
+ sudo yum install zlib zlib-devel
+
+ * Install bzip2:
+
+ sudo yum install bzip2 bzip2-devel
+
+ * Install lz4:
+
+ sudo yum install lz4-devel
+
+ * Install ASAN (optional for debugging):
+
+ sudo yum install libasan
+
+ * Install zstandard:
+ * With [EPEL](https://fedoraproject.org/wiki/EPEL):
+
+ sudo yum install libzstd-devel
+
+ * With CentOS 8:
+
+ sudo dnf install libzstd-devel
+
+ * From source:
+
+ wget https://github.com/facebook/zstd/archive/v1.1.3.tar.gz
+ mv v1.1.3.tar.gz zstd-1.1.3.tar.gz
+ tar zxvf zstd-1.1.3.tar.gz
+ cd zstd-1.1.3
+ make && sudo make install
+
+* **OS X**:
+ * Install latest C++ compiler that supports C++ 17:
+ * Update XCode: run `xcode-select --install` (or install it from XCode App's settting).
+ * Install via [homebrew](http://brew.sh/).
+ * If you're first time developer in MacOS, you still need to run: `xcode-select --install` in your command line.
+ * run `brew tap homebrew/versions; brew install gcc7 --use-llvm` to install gcc 7 (or higher).
+ * run `brew install rocksdb`
+
+* **FreeBSD** (11.01):
+
+ * You can either install RocksDB from the Ports system using `cd /usr/ports/databases/rocksdb && make install`, or you can follow the details below to install dependencies and compile from source code:
+
+ * Install the dependencies for RocksDB:
+
+ export BATCH=YES
+ cd /usr/ports/devel/gmake && make install
+ cd /usr/ports/devel/gflags && make install
+
+ cd /usr/ports/archivers/snappy && make install
+ cd /usr/ports/archivers/bzip2 && make install
+ cd /usr/ports/archivers/liblz4 && make install
+ cd /usr/ports/archivesrs/zstd && make install
+
+ cd /usr/ports/devel/git && make install
+
+
+ * Install the dependencies for RocksJava (optional):
+
+ export BATCH=yes
+ cd /usr/ports/java/openjdk7 && make install
+
+ * Build RocksDB from source:
+ cd ~
+ git clone https://github.com/facebook/rocksdb.git
+ cd rocksdb
+ gmake static_lib
+
+ * Build RocksJava from source (optional):
+ cd rocksdb
+ export JAVA_HOME=/usr/local/openjdk7
+ gmake rocksdbjava
+
+* **OpenBSD** (6.3/-current):
+
+ * As RocksDB is not available in the ports yet you have to build it on your own:
+
+ * Install the dependencies for RocksDB:
+
+ pkg_add gmake gflags snappy bzip2 lz4 zstd git jdk bash findutils gnuwatch
+
+ * Build RocksDB from source:
+
+ cd ~
+ git clone https://github.com/facebook/rocksdb.git
+ cd rocksdb
+ gmake static_lib
+
+ * Build RocksJava from source (optional):
+
+ cd rocksdb
+ export JAVA_HOME=/usr/local/jdk-1.8.0
+ export PATH=$PATH:/usr/local/jdk-1.8.0/bin
+ gmake rocksdbjava
+
+* **iOS**:
+ * Run: `TARGET_OS=IOS make static_lib`. When building the project which uses rocksdb iOS library, make sure to define two important pre-processing macros: `ROCKSDB_LITE` and `IOS_CROSS_COMPILE`.
+
+* **Windows** (Visual Studio 2017 to up):
+ * Read and follow the instructions at CMakeLists.txt
+ * Or install via [vcpkg](https://github.com/microsoft/vcpkg)
+ * run `vcpkg install rocksdb:x64-windows`
+
+* **AIX 6.1**
+ * Install AIX Toolbox rpms with gcc
+ * Use these environment variables:
+
+ export PORTABLE=1
+ export CC=gcc
+ export AR="ar -X64"
+ export EXTRA_ARFLAGS=-X64
+ export EXTRA_CFLAGS=-maix64
+ export EXTRA_CXXFLAGS=-maix64
+ export PLATFORM_LDFLAGS="-static-libstdc++ -static-libgcc"
+ export LIBPATH=/opt/freeware/lib
+ export JAVA_HOME=/usr/java8_64
+ export PATH=/opt/freeware/bin:$PATH
+
+* **Solaris Sparc**
+ * Install GCC 7 and higher.
+ * Use these environment variables:
+
+ export CC=gcc
+ export EXTRA_CFLAGS=-m64
+ export EXTRA_CXXFLAGS=-m64
+ export EXTRA_LDFLAGS=-m64
+ export PORTABLE=1
+ export PLATFORM_LDFLAGS="-static-libstdc++ -static-libgcc"
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