Install rgl on R-Server Ubuntu

I want to to install rgl on R-Server, running on Ubuntu.
At the bas prompt I installed

sudo apt-get build-dep r-cran-rgl

Reading package lists... Done Building dependency tree Reading state
information... Done The following extra packages will be installed:
libglu1-mesa The following NEW packages will be installed:
libglu1-mesa r-cran-rgl 0 upgraded, 2 newly installed, 0 to remove and

0 not upgraded. Need to get 1,645 kB of archives. After this
operation, 3,875 kB of additional disk space will be used. Do you want
to continue? [Y/n] Y Get:1 http://archive.ubuntu.com/ubuntu/
trusty/main libglu1-mesa amd64 9.0.0-2 [195 kB] Get:2
http://archive.ubuntu.com/ubuntu/ trusty/universe r-cran-rgl amd64
0.93.996-1 [1,450 kB] Fetched 1,645 kB in 1s (1,047 kB/s) Selecting previously unselected package libglu1-mesa:amd64. (Reading database
... 55586 files and directories currently installed.) Preparing to
unpack .../libglu1-mesa_9.0.0-2_amd64.deb ... Unpacking
libglu1-mesa:amd64 (9.0.0-2) ... Selecting previously unselected
package r-cran-rgl. Preparing to unpack

.../r-cran-rgl_0.93.996-1_amd64.deb ... Unpacking r-cran-rgl
(0.93.996-1) ... Setting up libglu1-mesa:amd64 (9.0.0-2) ... Setting
up r-cran-rgl (0.93.996-1) ... Processing triggers for libc-bin
(2.19-0ubuntu6.6) ...

Thats it. The three points at the end do not indicate that there was more to copy. Then I logged in into R-Server and tried to run

install.packages("rgl", repos="http://R-Forge.R-project.org")

which resulted in an error, namely:

.... 
configure: using libpng-config
configure: using libpng dynamic linkage
checking for X... libraries , headers 
checking GL/gl.h usability... no
checking GL/gl.h presence... no
checking for GL/gl.h... no

checking GL/glu.h usability... no
checking GL/glu.h presence... no
checking for GL/glu.h... no
configure: error: missing required header GL/gl.h
ERROR: configuration failed for package ‘rgl’
* removing ‘/home/clambio/R/x86_64-pc-linux-gnu-library/3.2/rgl’
Warning in install.packages :
  installation of package ‘rgl’ had non-zero exit status

The downloaded source packages are in

    ‘/tmp/RtmpT5iyrb/downloaded_packages’

Any ideas what is going wrong?!