Trying to build process with cygwin 1.7.7 on windows XP, I get the following error. Any ideas ? $ (date && ghc --version && cabal update && cabal configure && cabal build) >log 2>&1 Mon Dec 6 14:23:11 PST 2010 The Glorious Glasgow Haskell Compilation System, version 6.12.3 Downloading the latest package list from hackage.haskell.org Resolving dependencies... Configuring process-1.0.1.4... configure: WARNING: unrecognized options: --with-compiler checking for gcc... gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.exe checking for suffix of executables... .exe checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -E checking for grep that handles long lines and -e... /usr/bin/grep checking for egrep... /usr/bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for pid_t... yes checking vfork.h usability... no checking vfork.h presence... no checking for vfork.h... no checking for fork... yes checking for vfork... yes checking for working fork... yes checking for working vfork... (cached) yes checking signal.h usability... yes checking signal.h presence... yes checking for signal.h... yes checking sys/wait.h usability... yes checking sys/wait.h presence... yes checking for sys/wait.h... yes checking fcntl.h usability... yes checking fcntl.h presence... yes checking for fcntl.h... yes checking for setitimer,... no checking for sysconf... yes checking value of SIG_DFL... 0 checking value of SIG_IGN... 1 configure: creating ./config.status config.status: creating include/HsProcessConfig.h config.status: include/HsProcessConfig.h is unchanged configure: WARNING: unrecognized options: --with-compiler Preprocessing library process-1.0.1.4... Building process-1.0.1.4... In file included from C:/HP/lib/base-4.2.0.2/include/HsBase.h:33, from cbits\runProcess.c:12:0: C:/cygwin/usr/include/stdlib.h:110: warning: `__warning__' attribute directive ignored C:/cygwin/usr/include/stdlib.h:117: warning: `__warning__' attribute directive ignored In file included from C:/HP/mingw/bin/../lib/gcc/ mingw32/3.4.5/../../../../include/windows.h:98, from C:/HP/lib/base-4.2.0.2/include/HsBase.h:88, from cbits\runProcess.c:12:0: C:/HP/mingw/bin/../lib/gcc/mingw32/3.4.5/../../../../include/ winsock2.h:103:2: warning: #warning "fd_set and associated macros have been defined in sys/types. This may cause runtime problems with W32 sockets" In file included from cbits\runProcess.c:12:0: C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_ftruncate': C:/HP/lib/base-4.2.0.2/include/HsBase.h:347: warning: implicit declaration of function `ftruncate' C:/HP/lib/base-4.2.0.2/include/HsBase.h: At top level: C:/HP/lib/base-4.2.0.2/include/HsBase.h:378: error: syntax error before "stsize_t" C:/HP/lib/base-4.2.0.2/include/HsBase.h:378: warning: type defaults to `int' in declaration of `stsize_t' C:/HP/lib/base-4.2.0.2/include/HsBase.h:378: warning: data definition has no type or storage class C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_sizeof_stat': C:/HP/lib/base-4.2.0.2/include/HsBase.h:387: error: invalid application of `sizeof' to incomplete type `C:/HP/lib/base-4.2.0.2/ include/HsBase.h' C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_st_mtime': C:/HP/lib/base-4.2.0.2/include/HsBase.h:390: error: dereferencing pointer to incomplete type C:/HP/lib/base-4.2.0.2/include/HsBase.h: At top level: C:/HP/lib/base-4.2.0.2/include/HsBase.h:391: error: syntax error before "__hscore_st_size" C:/HP/lib/base-4.2.0.2/include/HsBase.h:391: warning: return type defaults to `int' C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_st_size': C:/HP/lib/base-4.2.0.2/include/HsBase.h:391: error: dereferencing pointer to incomplete type C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_st_mode': C:/HP/lib/base-4.2.0.2/include/HsBase.h:393: error: dereferencing pointer to incomplete type C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_st_dev': C:/HP/lib/base-4.2.0.2/include/HsBase.h:394: error: dereferencing pointer to incomplete type C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_st_ino': C:/HP/lib/base-4.2.0.2/include/HsBase.h:395: error: dereferencing pointer to incomplete type C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_stat': C:/HP/lib/base-4.2.0.2/include/HsBase.h:400: warning: implicit declaration of function `_wstati64' C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_fstat': C:/HP/lib/base-4.2.0.2/include/HsBase.h:404: warning: implicit declaration of function `_fstati64' C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_open': C:/HP/lib/base-4.2.0.2/include/HsBase.h:591: warning: implicit declaration of function `_wsopen' C:/HP/lib/base-4.2.0.2/include/HsBase.h: At top level: C:/HP/lib/base-4.2.0.2/include/HsBase.h:608: error: syntax error before "__hscore_lseek" C:/HP/lib/base-4.2.0.2/include/HsBase.h:608: error: syntax error before "off64_t" C:/HP/lib/base-4.2.0.2/include/HsBase.h:608: warning: return type defaults to `int' C:/HP/lib/base-4.2.0.2/include/HsBase.h: In function `__hscore_lseek': C:/HP/lib/base-4.2.0.2/include/HsBase.h:609: warning: implicit declaration of function `_lseeki64' C:/HP/lib/base-4.2.0.2/include/HsBase.h:609: error: `fd' undeclared (first use in this function) C:/HP/lib/base-4.2.0.2/include/HsBase.h:609: error: (Each undeclared identifier is reported only once C:/HP/lib/base-4.2.0.2/include/HsBase.h:609: error: for each function it appears in.) C:/HP/lib/base-4.2.0.2/include/HsBase.h:609: error: `off' undeclared (first use in this function) C:/HP/lib/base-4.2.0.2/include/HsBase.h:609: error: `whence' undeclared (first use in this function) cbits\runProcess.c: In function `runInteractiveProcess': cbits\runProcess.c:387:0: warning: implicit declaration of function `_get_osfhandle' cbits\runProcess.c:463:0: warning: implicit declaration of function `_open_osfhandle'