CMake: fix include dir in export #434
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Because all headers are installed in `CMAKE_INSTALL_INCLUDEDIR` which is defined in the main `CMakeLists.txt` as: ```cmake set(CMAKE_INSTALL_INCLUDEDIR include/lib3mf CACHE PATH "directory for installing header files") ```
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Hi,
In nixpkgs, we are using lib3mf CMake exports in meshlab, and without a proper
lib3mf_INCLUDE_DIR, we get:This is because all headers are installed in
CMAKE_INSTALL_INCLUDEDIR, which is defined in the mainCMakeLists.txtas:ref. NixOS/nixpkgs#445078 & cnr-isti-vclab/meshlab#1617