IJulia (not found in project or manifest)

Try using Pkg.add rather than Pkg.build

If you look at the docs/help for both of them I think add is what you want.

julia> using Pkg

help?> Pkg.add
...
  Add a package to the current project. This package will be available by using the import and using keywords in the Julia REPL, and
  if the current project is a package, also inside that package.
...

help?> Pkg.build
...
  Run the build script in deps/build.jl for pkg and all of its dependencies in depth-first recursive order. If no argument is given to
  build, the current project is built, which thus needs to be a package. This function is called automatically on any package that
  gets installed for the first time. verbose = true prints the build output to stdout/stderr instead of redirecting to the build.log
  file.
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