Hello, I need ghc 6.8.1 for a codebase that depends on it and I'm having trouble building it on the current ubuntu. Error output attached. Martin configure: creating ./config.status config.status: creating network.buildinfo config.status: creating include/HsNetworkConfig.h Configuring network-2.1.0.0... rm -f network/GNUmakefile cp Makefile.local network if ifBuildable/ifBuildable network; then \ cd network && setup/Setup makefile -f GNUmakefile; \ fi Socket.hsc: In function ‘main’: Socket.hsc:1143: error: invalid application of ‘sizeof’ to incomplete type ‘struct ucred’ Socket.hsc:1143: error: invalid application of ‘sizeof’ to incomplete type ‘struct ucred’ Socket.hsc:1143: error: invalid application of ‘sizeof’ to incomplete type ‘struct ucred’ Socket.hsc:1149: error: invalid use of undefined type ‘struct ucred’ Socket.hsc:1150: error: invalid use of undefined type ‘struct ucred’ Socket.hsc:1151: error: invalid use of undefined type ‘struct ucred’ compiling dist/build/Network/Socket_hsc_make.c failed command was: gcc -c -D__GLASGOW_HASKELL__=608 -I/tmp/ghc-6.8.1/includes -I/tmp/ghc-6.8.1/gmp/gmpbuild -D__GLASGOW_HASKELL__=608 -DCALLCONV=ccall -Iinclude dist/build/Network/Socket_hsc_make.c -o dist/build/Network/Socket_hsc_make.o Preprocessing library network-2.1.0.0... make[1]: *** [network/GNUmakefile] Error 1 make[1]: Leaving directory `/tmp/ghc-6.8.1/libraries' make: *** [stage1] Error 2