Hi Mani,
The problem is that ar the executable is not installed. The immediate solution is to add add a build dependency on binutils.
However you appear to be calling autotools from insde cmake. That's going to be fragile and is not recommended as it's not going to behave well in both the devel and install workspaces without quite a few hacks. (Such as forcing a rebuild every build) It's probably better to package the different package separately or quickly rewrite the build for the package in cmake. Note your current cmake does not install any of the SDK so it won't work when someone tries to use your installed packages if it needs either a library or header from the sdk.
Tully