When I try to build from source in Windows 7, x64, visual studio 2010 full, perl-5.14.1 I get the following error: link -subsystem:console -out:..\generate_uudmap.exe @C:\Users\lucar\AppD ata\Local\Temp\nmD6A3.tmp ..\generate_uudmap.obj : fatal error LNK1112: module machine type 'X86' conflict s with target machine type 'x64' NMAKE : fatal error U1077: '"C:\Program Files (x86)\Microsoft Visual Studio 10.0 \VC\BIN\link.EXE"' : return code '0x458' Here you can find my win32/Makefile: http://pastebin.com/nxmTYsEG. It's all pretty default stuff and only directories, compiler version and debug are set. Here there is the complete log from nmake: http://pastebin.com/YjjTtaX9. I looked in vain for a solution on the internet. Some suggestions? Thanks, regThread Next