error: field has incomplete type 'KDL::TreeElement'

[JetForMe]

Building with the instructions here: http://wiki.ros.org/hydro/Installation/OSX/Homebrew/Source, I ran into this during catkin_make_isolated:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/utility:221:9: error: field has incomplete type 'KDL::TreeElement'
    _T2 second;
        ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/__tree:602:16: note: in instantiation of template class 'std::__1::pair<std::__1::basic_string<char>, KDL::TreeElement>' requested here
    value_type __value_;
               ^
.
.
.

I tried the solution here: http://answers.ros.org/question/94771/building-ros-on-osx-109-solution/?answer=101176#post-id-101176, which had some git update steps, but those fail with

EclipseSSD:catkin_ws rmann$ cd src/orocos_kdl
EclipseSSD:orocos_kdl rmann$ git remote add upstream git@github.com:orocos/orocos_kinematics_dynamics.git
fatal: Not a git repository (or any of the parent directories): .git

[wjwwood]

Your checkout of the source code was done by extracting tarballs rather than by checking out git repos, so his instructions won't work. Instead do this:

cd src
curl https://github.com/orocos/orocos_kinematics_dynamics/pull/4.diff | patch -p1

You might get a patch failure on a CMakeLists.txt, but you can ignore that.

[wjwwood]

Please close this is that works for you.

[JetForMe]

Thank you, that worked. What did I do differently that got me tar-based directories, rather than git-based?

[wjwwood]

The --tar option to rosinstall_generator, I made that the default because it is much more efficient to download the tar balls rather than checking out all of those git repositories.