We found that there are small calculation differences in the versions of msvcrt.dll, that come with Windows 2000 based and Windows XP based operating systems.

One possible solution is to use a specific VC runtime by overriding the default DLL in the linker specs, e.g. :

CC       = mingw32-gcc ..... -specs=local_gccspecs
...
all: 	local_gccspecs $(PROGS)

local_gccspecs: .
<tab>mingw32-gcc -dumpspecs|sed 's/-lmsvcrt/-lmsvcr71/g'>local_gccspecs

This worked for us in the 32-bit 4.4.0 of MinGW/GCC, it will probably not work with the x64 4.5.0 because there seems not to be such a DLL there (and thus no import library either of course)

I assume that the functions that are affected are the exponential ones.