Hi, I am trying to build GHC on NetBSD/amd64. First, I built GHC-6.12.3 by porting from OpenBSD/amd64. After that, trying to build several versions (6.12.3, 7.0.4, 7.4.2) of GHC by the stage2 compiler. Build itself succeeded and compiling by the ghc seems no problem so far. However, ghci (all versions) crashes always by segmentation fault. --------------------------------------------------------------------- $ ghci GHCi, version 7.4.2: http://www.haskell.org/ghc/ :? for help Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. zsh: segmentation fault (core dumped) /usr/local/ghc-7.4.2/bin/ghci --------------------------------------------------------------------- backtrace by gdb shows only "s2xW_info ()". ktrace (kernel trace) output is as follows. --------------------------------------------------------------------- 4494 1 ghc CALL __sigprocmask14(3,0x7f7fffff49e0,0) 4494 1 ghc RET __sigprocmask14 0 4494 1 ghc CALL _lwp_self 4494 1 ghc RET _lwp_self 1 4494 1 ghc CALL __sigprocmask14(1,0x7f7fffff4970,0x7f7fffff49e0) 4494 1 ghc RET __sigprocmask14 0 4494 1 ghc CALL __sigprocmask14(3,0x7f7fffff49e0,0) 4494 1 ghc RET __sigprocmask14 0 4494 1 ghc CALL issetugid 4494 1 ghc RET issetugid 0 4494 1 ghc PSIG SIGSEGV SIG_DFL: code=SEGV_MAPERR, addr=0xfffffffff610bfa5, trap=6) 4494 2 ghc RET __kevent50 -1 errno 4 Interrupted system call 4494 3 ghc RET ___lwp_park50 -1 errno 4 Interrupted system call 4494 1 ghc NAMI "ghc.core" --------------------------------------------------------------------- What should I check next? Thanks in advance.