settings.gradle:
includeFlat 'projA','projB','projC'

projA-build.gradle:
compile project(":projB")

Could not resolve all dependencies for configuration ':runtime'.
Could not find master:restclient:4.0-SNAPSHOT.

subprojects {
  afterEvaluate { Project proj ->
      def is_snap = false
      def reltype = "releases"
      def artifact_name = sprintf("%s-%s.jar"
                               ,project['name']
                                 ,project['version'])
      def nexus_release_path = sprintf("%s/nexus/content/repositories/releases/%s/%s/%s/%s"
                               ,project['nexus_url']
                               ,project['groupId'].replaceAll("\.","/")
                               ,project['name']
                               ,project['version']
                               ,artifact_name
                               )

      if(project.version.contains("SNAPSHOT")){
          reltype = "snapshots"
          is_snap = true
      }

      uploadArchives {
        // only try the upload if it's not already there
        onlyIf {
          try {
            def artifact_exists = new URL(nexus_release_path).bytes
            // if we get here then the artifact existed and we only want to
            // build if this is a snapshot version
            is_snap || false
          } catch (FileNotFoundException e) {
            // this means we couldn't find the artifact in nexus
            if(!is_snap){
              println "NOTE ==> Don't forget to create new git tag for $artifact_name!"
            }
            true
          }
        }

        repositories {
          mavenDeployer {
            repository(url: "${project.nexus_url}/nexus/content/repositories/$reltype") {
              authentication(userName: project.nexus_user, password: project.nexus_password)
            }
            pom.version = "${project['version']}"
            pom.artifactId = "${project.name}"
            pom.groupId = "${groupId}"
          }
        }
      }
...
}