[rock-user] curl not found - System Check found errors

Hi,

while trying to build the router target I, the build process stops with 
following error message:
-------------------------------------------------------------
System Check: Program 'curl' not found!
The curl utility is needed for Downloading the package
source tars. Install the latest curl version.

System Check found errors -> not doing anything.
-------------------------------------------------------------

But as far as I can see the curl package is installed on the build system.
-------------------------------------------------------------
$ mine -q curl
curl 7.10.8 2.0.1
-------------------------------------------------------------

I've tried to build the router target both on a drock and a server based build 
system with the same effect.

Any help appreciated.
Thanks in advance.

Greetings,

Christian