bazel

module (bold = default) build dependencies
bazel/0.2.2 jdk/1.8.0 gcc/4.9.3
bazel/0.2.3 jdk/1.8.0 gcc/4.9.3
bazel/0.3.0 jdk/1.8.0 gcc/4.9.3
bazel/0.3.2 jdk/1.8.0_91 gcc/4.9.4

also see Using Software.