Open Visual Studio 2008 Command Prompt
1) >DUMPBIN /EXPORTS libmicrohttpd.dll.a > def.txt
2) change def.txt into libmicrohttpd.dll.def with the following contents:
EXPORTS
	all symbols from def.txt, remove first underscores from symbols
3) >LIB /machine:X86 /def:libmicrohttpd.dll.def /name:libmicrohttpd-5.dll
