libGDX - gdx-backend-jglfw is missing and some others

问题

I am new to libGDX and trying to compile the source,

I have eclipse Luna 4.4.1 jdk1.8.0_11 installed, and JAVA_HOME is set jre8 ant version 1.9.3 // executed ant -f fetch.xml in libGDX filder clean all projects

but as I have touched nothing in the project there are 25 errors, it is my first JAVA-libGDX attempt and dying here...

Description	Resource	Path	Location	Type
Project 'gdx-backend-jglfw' is missing required library: '/gdx/libs/gdx-natives.jar'	gdx-backend-jglfw		Build path	Build Path Problem
Project 'gdx-backend-jglfw' is missing required library: 'libs/gdx-backend-jglfw-natives.jar'	gdx-backend-jglfw		Build path	Build Path Problem
Project 'gdx-backend-jglfw' is missing required library: 'libs/jglfw.jar'	gdx-backend-jglfw		Build path	Build Path Problem
Project 'gdx-backend-lwjgl' is missing required library: '/gdx/libs/gdx-natives.jar'	gdx-backend-lwjgl		Build path	Build Path Problem
Project 'gdx-backend-robovm' is missing required library: 'libs/robovm-cacerts-full.jar'	gdx-backend-robovm		Build path	Build Path Problem
Project 'gdx-backend-robovm' is missing required library: 'libs/robovm-cocoatouch.jar'	gdx-backend-robovm		Build path	Build Path Problem
Project 'gdx-backend-robovm' is missing required library: 'libs/robovm-objc.jar'	gdx-backend-robovm		Build path	Build Path Problem
Project 'gdx-backend-robovm' is missing required library: 'libs/robovm-rt.jar'	gdx-backend-robovm		Build path	Build Path Problem
Project 'gdx-bullet' is missing required library: 'libs/gdx-bullet-natives.jar'	gdx-bullet		Build path	Build Path Problem
Project 'gdx-controllers-desktop' is missing required library: 'libs/gdx-controllers-desktop-natives.jar'	gdx-controllers-desktop		Build path	Build Path Problem
Project 'gdx-tests-lwjgl' is missing required library: '/gdx-box2d/libs/gdx-box2d-natives.jar'	gdx-tests-lwjgl		Build path	Build Path Problem
Project 'gdx-tests-lwjgl' is missing required library: '/gdx-controllers-desktop/libs/gdx-controllers-desktop-natives.jar'	gdx-tests-lwjgl		Build path	Build Path Problem
Project 'gdx-tests-lwjgl' is missing required library: '/gdx-freetype/libs/gdx-freetype-natives.jar'	gdx-tests-lwjgl		Build path	Build Path Problem
The project cannot be built until build path errors are resolved	gdx-backend-jglfw		Unknown	Java Problem
The project cannot be built until build path errors are resolved	gdx-backend-lwjgl		Unknown	Java Problem
The project cannot be built until build path errors are resolved	gdx-backend-robovm		Unknown	Java Problem
The project cannot be built until build path errors are resolved	gdx-bullet		Unknown	Java Problem
The project cannot be built until build path errors are resolved	gdx-controllers-desktop		Unknown	Java Problem
The project cannot be built until build path errors are resolved	gdx-tests-lwjgl		Unknown	Java Problem
The project cannot be built until its prerequisite gdx-tests is built. Cleaning and building all projects is recommended	gdx-tests-android		Unknown	Java Problem
The project cannot be built until its prerequisite gdx-tests is built. Cleaning and building all projects is recommended	gdx-tests-gwt		Unknown	Java Problem
The project was not built since it depends on gdx-backend-jglfw, which has build path errors	gdx-tests-jglfw		Unknown	Java Problem
The project was not built since it depends on gdx-backend-lwjgl, which has build path errors	gdx-tools		Unknown	Java Problem
The project was not built since it depends on gdx-backend-robovm, which has build path errors	gdx-tests-iosrobovm		Unknown	Java Problem
The project was not built since it depends on gdx-bullet, which has build path errors	gdx-tests		Unknown	Java Problem

in the error section of eclipse I am getting these maybe help to sort out the problem?

eclipse.buildId=4.4.1.M20140925-0400
java.version=1.8.0_11
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.standard.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.standard.product

org.eclipse.egit.ui
Warning
Mon Oct 27 20:15:01 EET 2014
Warning: The environment variable HOME is not set. The following directory will be used to store the Git
user global configuration and to define the default location to store repositories: 'C:\Users\gokhan'. If this is
not correct please set the HOME environment variable and restart Eclipse. Otherwise Git for Windows and
EGit might behave differently since they see different configuration options.
This warning can be switched off on the Team > Git > Confirmations and Warnings preference page.
*************************************************************
eclipse.buildId=4.4.1.M20140925-0400
java.version=1.8.0_11
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.standard.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.standard.product

org.eclipse.egit.ui
Warning
Mon Oct 27 20:15:01 EET 2014
Warning: EGit couldn't detect the installation path "gitPrefix" of native Git. Hence EGit can't respect system level
Git settings which might be configured in ${gitPrefix}/etc/gitconfig under the native Git installation directory.
The most important of these settings is core.autocrlf. Git for Windows by default sets this parameter to true in
this system level configuration. The Git installation location can be configured on the
Team > Git > Configuration preference page's 'System Settings' tab.
This warning can be switched off on the Team > Git > Confirmations and Warnings preference page.
*************************************************************
eclipse.buildId=4.4.1.M20140925-0400
java.version=1.8.0_11
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.standard.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.standard.product

org.eclipse.ui.navigator
Warning
Mon Oct 27 20:14:59 EET 2014
Can't find Navigator Content Descriptor with id: org.eclipse.jst.servlet.ui.EnhancedJavaRendering

I also check about the HOME folder, in system variable there exists JAVA_HOME to "C:\Progra~2\Java\jdk1.8.0_11"

so why do you think I am getting these error batch? thanks