How to build MongoRocks for MongoDB 3.2

This explains how I built MongoDB 3.2 from source with support for RocksDB thanks to help from Igor Canadi. There are more details here and here. My server uses Fedora.

# Install many of the dependencies for MongoRocks
sudo yum install snappy-devel zlib-devel bzip2-devel lz4-devel
sudo yum install scons gcc-g++ git

# Unpack MongoDB 3.2 source in $MONGOSRC

# Directory in which git repos are created
mkdir ~/git

# Get MongoRocks engine
cd ~/git
git clone https://github.com/mongodb-partners/mongo-rocks.git
cd mongo-rocks
git checkout --track origin/v3.2 -b v32

# get and build RocksDB libraries
git clone https://github.com/facebook/rocksdb.git
cd rocksdb
git checkout --track origin/4.4.fb -b 44fb
make static_lib

# prepare source build with support for RocksDB
cd $MONGOSRC
mkdir -p src/mongo/db/modules/
ln -sf ~/git/mongo-rocks src/mongo/db/modules/rocks

# build mongod & mongo binaries
# if you have zstd installed then use LIBS="lz4 zstd"
# if you need to debug and see command lines then add
#     --debug=presub
scons CPPPATH=/home/mdcallag/git/rocksdb/include \
      LIBPATH=/home/mdcallag/git/rocksdb \
      LIBS=lz4 mongod mongo

# install mongod
mkdir -p ~/b/m321
cd ~/b/m321
mkdir data
mkdir bin
cp $MONGOSRC/build/opt/mongo/mongod bin
cp $MONGOSRC/build/opt/mongo/mongo bin

# create mongo.conf file with the text that follows. You must
# change $HOME and consider changing the value for cacheSizeGB
---
processManagement:
  fork: true
systemLog:
  destination: file
  path: $HOME/b/m321/log
  logAppend: true
storage:
  syncPeriodSecs: 600
  dbPath: $HOME/b/m321/data
  journal:
    enabled: true
operationProfiling.slowOpThresholdMs: 2000
replication.oplogSizeMB: 4000
storage.rocksdb.cacheSizeGB: 40
---

# start mongod, consider using numactl --interleave=all
bin/mongod --config mongo.conf --master --storageEngine rocksdb

# confirm RocksDB is there
$ head -1 data/db/LOG

2016/01/28-11:54:15.738641 7f7bd45d5e80 RocksDB version: 4.4.0