Self-made port breaks after deactivating and reactivating

[alex-rusch at t-online.de]

Hello fellow MacPorts enthusiasts,
 
I am new to developing Portfiles and I currently work on my first own port 
(in a local repository). It configures, builds, destroots and installs two 
targets: A dynamic library and an executable, the former being linked to 
the latter.
I can confirm that both are fully working after the port installation.
However, as soon as I deactivate the port and reactivate that same port 
variant, the executable does not work anymore as the library is no longer 
loaded correctly.
Error:
    dyld: Library not loaded: @rpath/libtestmp.dylib
      Referenced from: /opt/local/bin/bintestmp
      Reason: image not found
    Abort trap: 6
 
The library itself still works just fine.
 
Performing 'otool -L' on the binary reveals that, indeed, the shared 
library is no longer loaded correctly (its correct location is 
/opt/local/lib/libtestmp.dylib):
    @rpath/libtestmp.dylib (compatibility version 0.0.0, current version
    0.0.0)
     
Manually relinking the shared library with 'install_name_tool' succeeds and 
fixes the executable.
 
I tried to fix this issue myself and searched for similar problems but I 
could not find an answer, which is why I am finally writing to this list.
Can you help me with that issue? Am I missing something obvious?
 
Thanks a lot in advance, any help is much appreciated!

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