compile against libcgal fails: cannot find libX11.so

[fvila]

When using compiling a program using CGAL and Qt4 components, linking fails with:

make[2]: *** No rule to make target `/usr/lib/libX11.so', needed by `PCA_demo'. Stop.
make[1]: *** [CMakeFiles/PCA_demo.dir/all] Error 2
make: *** [all] Error 2

Same code, and same CMakeList.txt files worked on maverick.

Compiling an example (without Qt) works fine.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: libcgal5 3.6.1-2ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
Architecture: amd64
Date: Wed May 25 14:39:26 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: cgal
UpgradeStatus: Upgraded to natty on 2011-05-02 (22 days ago)

[fvila (francesc-vila)]

In fact, downloading the apt sources, and compiling makes it work. Maybe there has been some compiler/libraries/paths changes on the update from maverick to natty.

[fvila (francesc-vila)]

To check if I have some kind of conflict on packages when updating, I have installed a clean copy of ubuntu 11.04 on a virtual machine. This time is the 32bits version.

On the machine I have installed cmake, libcgal-demo, libcgal-dev and build-essential. This installs Qt4 and boost dependencies.

Trying to compile the PCA demo (using Qt components of CGAL) results on the same linking error (not finding /usr/lib/libX11.so and /usr/lib/libXext.so). When recompiling the deb package, the demo links correctly.

Thanks,

Francesc