step 1
install gsl
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| sudo apt install libgsl-dev
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step 2
add or modify the CMakeList.tst as this
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| find_package( PkgConfig REQUIRED)
pkg_check_modules( gsl REQUIRED gsl )
add_executable( my_exec src/my_source.cpp )
target_link_libraries( my_exec ${gsl_LIBRARIES} )
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