Try using the msbuild command line tools instead of the GUI. It may have been the build system attempting to build the code in parallel and causing the code not being downloaded properly. From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Vincent Xia Sent: Tuesday, June 18, 2013 10:52 PM To: FreeSWITCH Users Help Subject: [Freeswitch-users] having problem build 1.2.10 stable with VS2010 i downloaded the FS 1.2.10 stable tarball and was trying to build it in VS2010, after several attempts to "build all", the libeay32 still cannot be built, resulting fail of other dependencies includeing FreeSwitchCore, VS was reporting "netinet/sctp.h": No such file or directory then i added preprocess definitions OPENSSL_NO_SCTP and OPENSSL_NO_EC_NISTP_64_GCC_128, now it reports several unresolved external symbols, as BUF_memdup, BUF_strdup, BUF_strlcat, Camellia_set_key, EC_POINT_point2oct, RSA_flags, etc. so do i still missed any external libs or something was wrong with my settings?