Building a Julia Project

What This Guide Covers

This guide covers build environment and configuration topics specific to Julia projects. Please make sure to read our Getting Started and general build configuration guides first.

Community-Supported Warning

Travis CI support for Julia is contributed by the community and may be removed or altered at any time. If you run into any problems, please report them in the Travis CI issue tracker and cc @tkelman @ninjin @staticfloat @simonbyrne.

Choosing Julia versions to test against

Julia workers on Travis CI download and install a binary of Julia. You can select the most recent release version, the latest nightly build (downloaded from, or a specific version number (downloaded from To select one or more versions, use the julia: key in your .travis.yml file, for example:

language: julia
  - nightly
  - 0.5
  - 0.5.2

If the version number contains one ., then the latest release for that minor version is downloaded. The oldest versions for which binaries are available is 0.3.1 for Linux, or 0.2.0 for OS X.

Default Julia Version

If you leave the julia: key out of your .travis.yml, Travis CI will use the most recent release.

Default Test Script

If your repository follows the structure of a Julia package created by PkgDev.generate("$name", "$license"), then the following default script will be run:

julia -e 'Pkg.clone(pwd())'
julia -e '"$name")'
if [ -f test/runtests.jl ]; then
  julia --check-bounds=yes -e 'Pkg.test("$name", coverage=true)'

The package name $name is determined based on the repository name, removing the trailing .jl if present. A repository is treated as a Julia package when it contains a file at src/$name.jl. If your repository does not follow this structure, then the default script will be empty.

Dependency Management

If your Julia package has a deps/build.jl file, then"$name") will run that file to install any dependencies of the package. If you need to manually install any dependencies that are not handled by deps/build.jl, it is possible to specify a custom dependency installation command as described in the general build configuration guide.

Build Matrix

For Julia projects, env and julia can be given as arrays to construct a build matrix.

Environment Variable

The version of Julia a job is using is available as: