Steps to recreate:

git clone git@github.com:jbosstools/jbosstools-browsersim.git
cd jbosstools-browsersim/
mvn clean install

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mvn clean install
[INFO] Scanning for projects...
[WARNING] Could not transfer metadata org.jboss.tools:parent:4.4.0.Alpha1-SNAPSHOT/maven-metadata.xml from/to jbosstools-base (${jbosstools-base-site}): No connector available to access repository jbosstools-base (${jbosstools-base-site}) of type p2 using the available factories WagonRepositoryConnectorFactory
[WARNING] Could not transfer metadata org.jboss.tools:parent:4.4.0.Alpha1-SNAPSHOT/maven-metadata.xml from/to jbosstools-jst (${jbosstools-jst-site}): No connector available to access repository jbosstools-jst (${jbosstools-jst-site}) of type p2 using the available factories WagonRepositoryConnectorFactory
[INFO] Computing target platform for MavenProject: org.jboss.tools.browsersim.plugins:org.jboss.tools.browsersim.eclipse:3.8.0-SNAPSHOT @ /home/ldimaggi/local/redhat_git/jbosstools-browsersim/plugins/org.jboss.tools.browsersim.eclipse/pom.xml
[INFO] Adding repository http://download.jboss.org/jbosstools/targetplatforms/jbosstoolstarget/4.60.0.Alpha1-SNAPSHOT/REPO
[INFO] Adding repository http://download.jboss.org/jbosstools/neon/snapshots/builds/jbosstools-base_master
[INFO] Adding repository http://download.jboss.org/jbosstools/neon/snapshots/builds/jbosstools-jst_master
[INFO] Resolving dependencies of MavenProject: org.jboss.tools.browsersim.plugins:org.jboss.tools.browsersim.eclipse:3.8.0-SNAPSHOT @ /home/ldimaggi/local/redhat_git/jbosstools-browsersim/plugins/org.jboss.tools.browsersim.eclipse/pom.xml
[INFO]

{osgi.os=macosx, osgi.ws=cocoa, org.eclipse.update.install.features=true, osgi.arch=x86_64}

[ERROR] Cannot resolve project dependencies:
[ERROR] Software being installed: org.jboss.tools.browsersim.eclipse 3.8.0.qualifier
[ERROR] Missing requirement: org.jboss.tools.browsersim.ui 3.8.0.qualifier requires 'bundle org.eclipse.jetty.server [9.2.13,9.2.14)' but it could not be found
[ERROR] Cannot satisfy dependency: org.jboss.tools.browsersim.eclipse 3.8.0.qualifier depends on: bundle org.jboss.tools.browsersim.ui 3.7.0
[ERROR]
[ERROR] See http://wiki.eclipse.org/Tycho/Dependency_Resolution_Troubleshooting for help.
[ERROR] Cannot resolve dependencies of MavenProject: org.jboss.tools.browsersim.plugins:org.jboss.tools.browsersim.eclipse:3.8.0-SNAPSHOT @ /home/ldimaggi/local/redhat_git/jbosstools-browsersim/plugins/org.jboss.tools.browsersim.eclipse/pom.xml: See log for details -> [Help 1]