configure:cannot guess build type; you must specify one

换了msys2后。编译xerces-c-2.8.0。./runConfigure -pmingw-msys -cgcc -xg++ -s -P/opt/xercesc-2.8.0 后遇到如标题所看到的问题。详下：

checking for unistd.h... yes

checking for XMLByte... no

checking build system type... ./config.guess: unable to guess system type

This script, last modified 2002-07-09, has failed to recognize

the operating system you are using. It is advised that you

download the most up to date version of the config scripts from

ftp://ftp.gnu.org/pub/gnu/config/

If the version you run (./config.guess) is already up to date, please

send the following data and any information you think might be

pertinent to <config-patches@gnu.org> in order to provide the needed

information to handle your system.

config.guess timestamp = 2002-07-09

uname -m = x86_64

uname -r = 2.0.0(0.280/5/3)

uname -s = MINGW64_NT-6.1

uname -v = 2014-11-06 20:34

/usr/bin/uname -p = unknown

/bin/uname -X     =

hostinfo               =

/bin/universe          =

/usr/bin/arch -k       =

/bin/arch              = x86_64

/usr/bin/oslevel       =

/usr/convex/getsysinfo =

UNAME_MACHINE = x86_64

UNAME_RELEASE = 2.0.0(0.280/5/3)

UNAME_SYSTEM  = MINGW64_NT-6.1

UNAME_VERSION = 2014-11-06 20:34

configure: error: cannot guess build type; you must specify one

google也说是config.guess比較旧。msys环境编译没有问题，去mingw-w64的svn上拉了个config.guess下来替换掉后问题解决：

checking for stdint.h... yes

checking for unistd.h... yes

checking for XMLByte... no

checking build system type... x86_64-pc-mingw32

checking host system type... x86_64-pc-mingw32

configure: creating ./config.status

config.status: creating Makefile