Hi,

I'm trying to create a rospackage for an existing piece of 
code.
I'm using mk/download_unpack_build.mk to do this:
<snip>
TARBALL = toolchain-2.0
TARBALL_URL = http://gitorious.org/orocos-
toolchain/rtt/archive-tarball/toolchain-2.0
SOURCE_DIR = orocos-toolchain-rtt
TARBALL_PATCH =
#INITIAL_DIR = orocos-toolchain-rtt                                                                   

include $(shell rospack find mk)/download_unpack_build.mk
<snip>
 but I get the following error:

make
mkdir -p build
`rospack find rosbuild`/bin/download_checkmd5.py 
http://gitorious.org/orocos-toolchain/rtt/archive-
tarball/toolchain-2.0 toolchain-2.0
[rosbuild] Downloading http://gitorious.org/orocos-
toolchain/rtt/archive-tarball/toolchain-2.0 to 
toolchain-2.0...Done      
touch -c toolchain-2.0                           
rm -rf orocos-toolchain-rtt                      
cd build; tar xzf ../toolchain-2.0               
touch orocos-toolchain-rtt/unpacked              
touch: cannot touch `orocos-toolchain-rtt/unpacked': No 
such file or directory

After taking a look at mk/download_unpack_build.mk I noticed 
the problem, its is unpacking the tarball into the build 
directory, the result is that ${SOURCE_DIR} always needs the 
build prefix? Is this intended, because it is very confusing as 
the documentation does not explicity tell you that you need 
to add the build prefix in your ${SOURCE_DIR}. The same 
constraint holds for ${INITIAL_DIR}. (The example also has 
the build prefix)

adding 'cd build ;' to all commands could fix the problem.

Ruben