Hello, it seems there was the -mno-cygwin flag used for the mhmash library build and it isn't a Cygwin version at all: $ cygcheck /usr/bin/cygmhash-2.dll H:/bin/cygmhash-2.dll C:\WINNT\System32\msvcrt.dll C:\WINNT\System32\KERNEL32.dll C:\WINNT\System32\ntdll.dll Gerrit -- =^..^= http://www.command.com/