I recently installed a library (namely Hpysics, not on hackage) with
shared libraries (they were on by default).
When trying to do some stuff with the library (program attached), I get
a bunch of undefined symbol errors like this:

$ ghc --make Main.hs
Linking Main ...
/home/sven/.cabal/lib/i386-linux-ghc-7.8.4/Hpysics-0.0/libHSHpysics-0.0.a(Body.o):(.text+0x46e):
undefined reference to
`Hpysicszm0zi0_PhysicsziHpysicsziBoundingSphere_constructBoundingSpherezugo_info' /home/sven/.cabal/lib/i386-linux-ghc-7.8.4/Hpysics-0.0/libHSHpysics-0.0.a(Body.o):(.text+0x4f9):