$ ./configure
checking for gcc... no
checking for cc... no
checking for cc... no
checking for cl... cl
checking for C compiler default output file name... conftest.exe
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... .exe
checking for suffix of object files... obj
checking whether we are using the GNU C compiler... no
checking whether cl accepts -g... yes
checking for cl option to accept ANSI C... none needed
checking whether make sets $(MAKE)... yes
checking for Cygwin version of gcc... no
checking for SEH support in compiler... yes
checking for EXCEPTION_DISPOSITION support in include files... yes
checking for LPFN_ACCEPT support in winsock2.h... no
checking for winnt.h that ignores VOID define... no
checking for alloca declaration in malloc.h... yes
checking for cast to union support... no
checking for FINDEX_INFO_LEVELS in winbase.h... no
checking for MWMO_ALERTABLE in winuser.h... yes
checking for building with threads... no (default)
checking how to build libraries... shared
checking if 64bit support is requested... no
checking if Windows/CE build is requested... no
checking for Windows/CE celib directory... NO_CELIB
checking for cygpath... cygpath -w
checking compiler flags... using shared flags
checking for build with symbols... no
configure: creating ./config.status
config.status: creating Makefile
config.status: creating tclConfig.sh
config.status: creating tcl.hpj

$ make 


cl -c -nologo -O2 -MD -W3  -I"j:/tclcvs/tcl/generic" -DTCL_TOMMATH -DMP_PREC=4 -I"j:/tclcvs/tcl/libtommath" -I"./" -DPACKAGE_NAME=\"\" -DPACKAGE_TARNAME=\"\" -DPACKAGE_VERSION=\"\" -DPACKAGE_STRING=\"\" -DPACKAGE_BUGREPORT=\"\" -DHAVE_NO_LPFN_DECLS=1 -DHAVE_NO_FINDEX_ENUMS=1 -DTCL_CFGVAL_ENCODING=\"cp1252\" -DTCL_CFG_OPTIMIZED=1 -DTCL_CFG_DEBUG=1   -DBUILD_tcl "j:\tclcvs\tcl\generic\regcomp.c" -Foregcomp.obj
regcomp.c
j:\tclcvs\tcl\generic\tclInt.h(65) : error C2371: 'ptrdiff_t' : redefinition; different basic types
        C:\Program Files (x86)\Microsoft Visual Studio 8\VC\INCLUDE\crtdefs.h(464) : see declaration of 'ptrdiff_t'
j:\tclcvs\tcl\generic\regcomp.c(488) : warning C4267: 'function' : conversion from 'size_t' to 'unsigned int', possible loss of data
j:\tclcvs\tcl\generic\regcomp.c(493) : warning C4267: 'function' : conversion from 'size_t' to 'unsigned int', possible loss of data
j:\tclcvs\tcl\generic\regc_color.c(262) : warning C4267: 'function' : conversion from 'size_t' to 'unsigned int', possible loss of data
j:\tclcvs\tcl\generic\regc_color.c(269) : warning C4267: 'function' : conversion from 'size_t' to 'unsigned int', possible loss of data
j:\tclcvs\tcl\generic\regc_nfa.c(1355) : warning C4267: 'function' : conversion from 'size_t' to 'unsigned int', possible loss of data
j:\tclcvs\tcl\generic\regc_nfa.c(1356) : warning C4267: 'function' : conversion from 'size_t' to 'unsigned int', possible loss of data
j:\tclcvs\tcl\generic\regc_nfa.c(1367) : warning C4267: '=' : conversion from 'size_t' to 'int', possible loss of data
j:\tclcvs\tcl\generic\regc_cvec.c(49) : warning C4267: 'function' : conversion from 'size_t' to 'unsigned int', possible loss of data
j:\tclcvs\tcl\generic\regc_cvec.c(132) : warning C4244: '=' : conversion from '__int64' to 'int', possible loss of data