[CMake] how to link with a system library ?

[Steven Samuel Cole]

Christian Ehrlicher schrieb:
> Steven Samuel Cole schrieb:
>> Eric Noulard schrieb:
>>> 2008/9/21 Steven Samuel Cole <steven.samuel.cole at gmail.com>:
>>>> I would like to link a system library into an executable, GTK in 
>>>> this case.
>>>> What I'm trying to do is
>>>>
>>>> include(FindGTK)
>>>>
>>>> target_link_libraries(myexec $GTK_LIBRARIES)
>>>>
>>>> add_executable (myexec sources)
>>>>
>>>> Result:
>>>>
>>>> CMake Error: Attempt to add link library "GTK_LIBRARIES" to target 
>>>> "myexec"
>>>> which is not built by this project.
>>>>
>>>> What am I doing wrong ?
>>>
>>> You may be missing curly brace around variable could you try:
>>>
>>>
>>> target_link_libraries(myexec ${GTK_LIBRARIES})
>>>
>>
>> Thanks for your help! :-)
>>
>> ${GTK_LIBRARIES} instead of $GTK_LIBRARIES fixes the CMake Error 
>> problem, but I still get GTK link errors. Also, even though I do 
>> include_directories(${GTK_INCLUDE_DIR}), I still get
>> gtk/gtk.h: No such file or directory.
>>
>> Has anyone ever seen this working ?
> Are you sure you have set GTK_INCLUDE_DIR at all?
> 
> -> cmake documentation FIND_PACKAGE() should help here
> 
> 
> 
> Christian
> 

Why would I want to set GTK_INCLUDE_DIR ?
I want to _use_ it, so I don't have to specify include paths myself.

I have read the documentation on FIND_PACKAGE() and FindGTK(), but I 
can't seem to figure out how this is supposed to work.

Could someone provide a code snippet ?