Cmake not linking libraries that are found

Hello

I have a small C project in Clion I have running fine in Linux that I'm trying to get running in Windows (Msys2)

The trouble is that even though Cmake finds my external library, it fails to link it with target_link_libraries.

Here is my CMakeLists.txt:

cmake_minimum_required(VERSION 3.10)
project(gen_utility C)

add_executable(gen_utility main.c )

add_library(grid grid_sheet.c)

target_include_directories(gen_utility
        PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}
        PUBLIC ${CMAKE_SOURCE_DIR}/include
)

find_library(
        HPDF_LIB
        NAMES libhpdf hpdf
        HINTS "${CMAKE_SOURCE_DIR}/lib"
)

message(STATUS "HPDF_LIB: [${HPDF_LIB}]")

target_link_libraries(grid ${HPDF_LIB})
target_link_libraries(gen_utility ${HPDF_LIB} grid)

Which results in:

"C:\Program Files\JetBrains\CLion 2018.2.3\bin\cmake\win\bin\cmake.exe" --build C:\Users\User\CLionProjects\gen_utility\cmake-build-debug --target all -- -j 2
[ 50%] Built target grid
[ 75%] Linking C executable gen_utility.exe
CMakeFiles\gen_utility.dir/objects.a(main.c.obj): In function `show_stripe_pattern':
C:/Users/User/CLionProjects/gen_utility/main.c:33: undefined reference to `HPDF_Page_SetRGBStroke'
C:/Users/User/CLionProjects/gen_utility/main.c:34: undefined reference to `HPDF_Page_SetLineWidth'
C:/Users/User/CLionProjects/gen_utility/main.c:35: undefined reference to `HPDF_Page_MoveTo'
C:/Users/User/CLionProjects/gen_utility/main.c:36: undefined reference to `HPDF_Page_TextWidth'
...

But I'm confused because Cmake seems to find the library:

C:\Program Files\JetBrains\CLion 2018.2.3\bin\cmake\win\bin\cmake.exe" -DCMAKE_BUILD_TYPE=Debug -G "CodeBlocks - MinGW Makefiles" C:\Users\User\CLionProjects\gen_utility
-- HPDF_LIB: [C:/Users/User/CLionProjects/gen_utility/lib/libhpdf.a]
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Users/User/CLionProjects/gen_utility/cmake-build-debug

[Finished]

Any ideas?