Can't import installed scala/sbt library dependency from github - scala

Question

I need to install some dependencies in my simplest scala project (I am passing some tutorial) and one of them is from github. My build.sbt looks like this:
import sbt._
lazy val root = Project("root", file("."))
.dependsOn(smile)
.settings(
name := "Xyclade ML practical examples",
version := "1.0",
scalaVersion := "2.10.6",
sbtVersion := "0.13.9",
libraryDependencies += "org.scala-lang" % "scala-swing" % "2.10.2"
)
lazy val smile = ProjectRef(uri("https://github.com/haifengl/smile.git#master"), "root")
Maybe, I am missing some basic scala/sbt knowledge (I am a complete noob), but:
1) import com.github.haifengl._ fails with object github is not a member of package com
2) import smile._ leads to error not found: object smile
And as far as I found out, the library package should be called something like com.github.haifengl: https://github.com/haifengl/smile/search?utf8=%E2%9C%93&q=com.github.haifengl&type=Code

Answer 1

Are you sure package com.github.haifengl is in github project you've mentioned? Could it be in some of it's dependencies?
You should not add ProjectRef to github project, instead you'd better add it to dependencies:
"com.github.haifengl" % "smile-core" % "1.0.4"
Like following:
import sbt._
lazy val root = Project("root", file("."))
.settings(
name := "Xyclade ML practical examples",
version := "1.0",
scalaVersion := "2.10.6",
sbtVersion := "0.13.9",
libraryDependencies += Seq(
"org.scala-lang" % "scala-swing" % "2.10.2",
"com.github.haifengl" % "smile-core" % "1.0.4"
)