[CMake] install and rpath question

[Mathieu Malaterre]

Hello,

  I cannot figure out how to install a library so that the installed
version use the install_rpath.

# By default rpath works in built tree:
ADD_LIBRARY(foo SHARED foo.c)
ADD_LIBRARY(bla SHARED bla.c)
TARGET_LINK_LIBRARIES(bla foo)
INSTALL(
  TARGETS bla foo
  LIBRARY DESTINATION lib
)

SET_TARGET_PROPERTIES( bla
  PROPERTIES INSTALL_RPATH ???
  )

In the end the rpath should be working in the build tree and in the
installed tree.

thanks !

-- 
Mathieu