Installing workrave on LinuxMint 12

Hello,

When I tried to configure workrave in LinuxMint 12 I got this message:
......................
checking for X... no
configure: error: X11 required on Unix platform

I checked my version with this command:

Xorg -version

and the output was:

X.Org X Server 1.10.4
Release Date: 2011-08-19
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.24-29-server i686 Ubuntu
Current Operating System: Linux andrestoga-System-Product-Name
3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic
root=UUID=ae3b18c4-f638-4f17-896d-e18543feac00 ro quiet splash vt.handoff=7
Build Date: 29 September 2011 12:48:48AM
xorg-server 2:1.10.4-1ubuntu4 (For technical support please see
http://www.ubuntu.com/support)
Current version of pixman: 0.22.2
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.

and I don't know what is the problem?

Thanks--
Andrés Torres García

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