stdout: ========== Preprocessing library 'impl' for bkpcabal08-0.1.0.0... Building library 'impl' for bkpcabal08-0.1.0.0... Preprocessing library 'p' for bkpcabal08-0.1.0.0... Building library 'p' instantiated with A = <A> B = <B> for bkpcabal08-0.1.0.0... [2 of 2] Compiling B[sig] ( p/B.hsig, nothing ) Preprocessing library 'q' for bkpcabal08-0.1.0.0... Building library 'q' instantiated with A = <A> B = <B> for bkpcabal08-0.1.0.0... [2 of 4] Compiling B[sig] ( q/B.hsig, nothing ) [3 of 4] Compiling M ( q/M.hs, nothing ) [A changed] [4 of 4] Instantiating bkpcabal08-0.1.0.0-AXRwLVH6AHPAPRuAE4xIAV-p Preprocessing library 'q' for bkpcabal08-0.1.0.0... Building library 'q' instantiated with A = bkpcabal08-0.1.0.0-CrolCHWdUPxEXgJjJVo3gS-impl:A B = bkpcabal08-0.1.0.0-CrolCHWdUPxEXgJjJVo3gS-impl:B for bkpcabal08-0.1.0.0... [1 of 3] Compiling A[sig] ( q/A.hsig, dist/build/bkpcabal08-0.1.0.0-KvJoDFe8C5gFDsPNVRcKhc-q+L3CnvTzDmw47qNObPcAuvS/A.o ) [Prelude package changed] [2 of 3] Compiling B[sig] ( q/B.hsig, dist/build/bkpcabal08-0.1.0.0-KvJoDFe8C5gFDsPNVRcKhc-q+L3CnvTzDmw47qNObPcAuvS/B.o ) [Prelude package changed] Preprocessing library 'r' for bkpcabal08-0.1.0.0... Building library 'r' for bkpcabal08-0.1.0.0... stderr: ========== GHC.Linker.Loader.dynLoadObjs: Loading temp shared object failed During interactive linking, GHCi couldn't find the following symbol: Error relocating /tmp/ghc237567_0/libghc_1.so: undefined_function: symbol not found This may be due to you not asking GHCi to load extra object files, archives or DLLs needed by your current session. Restart GHCi, specifying the missing library using the -L/path/to/object/dir and -lmissinglibname flags, or simply by naming the relevant files on the GHCi command line. Alternatively, this link failure might indicate a bug in GHCi. If you suspect the latter, please report this as a GHC bug: https://www.haskell.org/ghc/reportabug stdout: ========== threadDelay was not interrupted