(I know gcc-4.3 is still under development, but it is expected to be the version of gcc in Fedora 9 which will be released around the end of April.) Has anyone tried or managed to build ghc with gcc-4.3? I tried yesterday in the Fedora buildsystem and got to: Socket.hsc: In function 'main': Socket.hsc:1144: error: invalid application of 'sizeof' to incomplete type 'struct ucred' Socket.hsc:1144: error: invalid application of 'sizeof' to incomplete type 'struct ucred' Socket.hsc:1144: error: invalid application of 'sizeof' to incomplete 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' Socket.hsc:1152: error: invalid use of undefined type 'struct ucred' Socket.hsc:2419: error: 'NI_MAXHOST' undeclared (first use in this function) Socket.hsc:2419: error: (Each undeclared identifier is reported only once Socket.hsc:2419: error: for each function it appears in.) Socket.hsc:2420: error: 'NI_MAXSERV' undeclared (first use in this function) compiling dist/build/Network/Socket_hsc_make.c failed command was: gcc -c -D__GLASGOW_HASKELL__=608 -I/builddir/build/BUILD/ghc-6.8.2/includes -I/builddir/build/BUILD/ghc-6.8.2/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... The full buildlog is at http://koji.fedoraproject.org/koji/getfile?taskID=425959&name=build.log Before investigating further I just wondered if anyone has already looked at this and might have a patch or workaround? Jens