tree ad8e7aae5bf6fd8b2e9f868768a3ad798b46a723
parent 9c96f500a39df6915f8f1ab53b60be9889f1572b
author Dakota Hawkins <dakotahawkins@gmail.com> 1535002954 -0400
committer Dakota Hawkins <dakotahawkins@gmail.com> 1535143915 -0400
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Use `$<INSTALL_PREFIX>` in `target_include_directories`

To make sure packages are relocatable, use `$<INSTALL_PREFIX>` in
`$<INSTALL_INTERFACE:...>` `target_include_directories`.

`$<INSTALL_PREFIX>` was introduced in CMake 2.8.11, which is already
being checked for locally.

References:

- https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#id19
- https://github.com/robotology/how-to-export-cpp-library/blob/claudio/headeronly/src/LibTemplateCMake/CMakeLists.txt#L42

Signed-off-by: Dakota Hawkins <dakotahawkins@gmail.com>