Just downloaded the latest .tar and tried to compile using MS Visual Studio 2005 Professional. on a Windows 2003 server Part of the output is shown below. What am I doing wrong? ------ Build started: Project: libsofia_sip_ua_static, Configuration: Debug Win32 ------ Performing Pre-Build Event... multipart mismatch with Recursive multipart () ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" ../libsofia-sip-ua/sip/sip_bad_mask: unknown header "" NOTE: NOTE: Remember to install pthreadVC2.dll to your path, too! NOTE: Compiling... msg_basic.c ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : error C2065: 'msg_error_hash' : undeclared identifier ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : error C2099: initializer is not a constant ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : error C2065: 'msg_error_d' : undeclared identifier ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : error C2099: initializer is not a constant ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : error C2065: 'msg_error_e' : undeclared identifier ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : error C2099: initializer is not a constant ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : warning C4047: 'initializing' : 'int' differs in levels of indirection from 'isize_t (__cdecl *)(const msg_header_t *,isize_t)' ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : warning C4047: 'initializing' : 'msg_parse_f (__cdecl *)' differs in levels of indirection from 'char *(__cdecl *)(msg_header_t *,const msg_header_t *,char *,isize_t)' ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : warning C4047: 'initializing' : 'msg_xtra_f (__cdecl *)' differs in levels of indirection from 'char [1]' ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : warning C4047: 'initializing' : 'msg_update_f (__cdecl *)' differs in levels of indirection from 'char [1]' ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(82) : warning C4047: 'initializing' : 'const char *' differs in levels of indirection from 'uintptr_t' ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(85) : error C2365: 'msg_error_d' : redefinition; previous definition was 'data variable' ..\..\sofia-sip\libsofia-sip-ua\msg\msg_basic.c(90) : error C2365: 'msg_error_e' : redefinition; previous definition was 'data variable' David Revill