A couple of days ago I realized that I can't compile latest HEAD on my Debian Squeeze laptop. Some -fPIC issues prevented compilation of integer-gmp library. I reported this as #8666. Today I got another PIC-related error on a different machine with openSUSE 11.4: /usr/lib64/gcc/x86_64-suse-linux/4.5/../../../../x86_64-suse-linux/bin/ld: dist/build/compile/compile-tmp/Data/Singletons/Core.dyn_o: re location R_X86_64_PC32 against undefined symbol `DataziSingletonsziTypes_Proved_con_info' can not be used when making a shared object; recompile with -fPIC /usr/lib64/gcc/x86_64-suse-linux/4.5/../../../../x86_64-suse-linux/bin/ld: final link failed: Bad value collect2: ld returned 1 exit status This happened with HEAD when I tried to compile testsuite configured via cabal file (on 7.6.3 all is fine): test-suite compile type: exitcode-stdio-1.0 ghc-options: -Wall -O0 -main-is Test.Main default-language: Haskell2010 main-is: Test/Main.hs Before I fil in another bug report could someone offer me a straightforward explanation of what is this whole -fPIC thing? Why does it break my code? Is this a known issue? Is there any kind of workaround for this? Janek