On 04/21/2017 03:40 PM, aishwarya selvaraj wrote:

add_library(fftw STATIC IMPORTED)
[...]
TARGET_LINK_LIBRARIES(prose fftw  )
[...]
make[2]: *** No rule to make target `fftw-NOTFOUND', needed by `prose'. Stop.

You are creating an IMPORTED target "fftw" but you aren't populating its IMPORTED_LOCATION [1] (or IMPORTED_LOCATION_<CONFIG> [2]) target property.
Without it CMake does not know what on disk library file to link to.

You can set target properties with set_property() or set_target_properties().

Nils

[1] https://cmake.org/cmake/help/latest/prop_tgt/IMPORTED_LOCATION.html
[2] https://cmake.org/cmake/help/latest/prop_tgt/IMPORTED_LOCATION_CONFIG.html
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