Issue on using {fmt} as a dependency with CMake - cmake

Question

I'm trying to apply modern CMake practices in my project.
And I've came up with an issue with the {fmt} library dependency.
The structure of a project is the following (in a brief):
dev/
|
+--- fmt/ *unpacked archive of 4.1.0 version*
|
+--- mylib/
| |
| +--- mylib.hpp
| |
| +--- CMakeLists.txt
| ***************************
| * ...
| * add_library(mylib INTERFACE)
| * TARGET_LINK_LIBRARIES(mylib PUBLIC fmt-header-only)
| * set(MYLIB_HEADERS_ALL mylib.hpp )
| * ...
| ***************************
|
+--- sample/
| |
| +--- main.cpp
| |
| +--- CMakeLists.txt
| ***************************
| * set(SAMPLE sample.hello_world)
| * add_executable(${SAMPLE} main.cpp)
| * TARGET_LINK_LIBRARIES(${SAMPLE} PRIVATE mylib)
| * install(TARGETS ${SAMPLE} DESTINATION bin)
| ***************************
|
+--- CMakeLists.txt
***************************
* include_directories(${CMAKE_CURRENT_SOURCE_DIR})
* add_subdirectory(fmt EXCLUDE_FROM_ALL)
* add_subdirectory(sample/hello_world)
***************************
When I try to build it I receive an error:
PATH/mylib/mylib.hpp:6:10: fatal error: fmt/format.hpp: No such file or directory
#include <fmt/format.hpp>
^~~~~~~~~~~~~~~~
compilation terminated.
Full reproduction can be found here:
https://bitbucket.org/ngrodzitski/cmake-issue-fmt-20180410
Any suggestions on the issue?

Answer 1

With the help from Mathieu Ropert in slack, I've resolved the issue in following steps:
TARGET_LINK_LIBRARIES(mylib INTERFACE fmt::fmt-header-only) in mylib/CMakeLists.txt (PUBLIC before).
add the following to root CMakeLists.txt: add_subdirectory(mylib) (that what makes a change).
I pushed final version to repo: https://bitbucket.org/ngrodzitski/cmake-issue-fmt-20180410.