BACnet Stack @ SourceForge.net
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Q1: GNU GCC Compiler, undefined reference to closesocket

A1: Under Project->Build Options->Linker settings, 
add "ws2_32" to Link Libraries.

Q2: GNU GCC Compiler, creating a DLL

A2: Under Project->Build Options->Linker settings, 
add "user32" to Link Libraries.

Q3: GNU GCC Compiler, undefined reference to _GetAdaptersInfo

A3: Under Project->Build Options->Linker settings, 
add "iphlpapi" to Link Libraries.