You'll need to check the build log then... The file openssl-1.0.0a.tar.gz is downloaded under the libs directory, I guess the build might report an error while downloading it if it's not on your system. If you want to get a clean build log, only build the project "Download OPENSSL", that downloads the .tar.gz file, and extracts it. The directory must be removed prior ro this, or it will think it's ok already. /Peter Från: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] För K K Skickat: den 5 mars 2013 14:39 Till: FreeSWITCH Users Help Ämne: Re: [Freeswitch-users] Failing build process - MVC++E2K10 - Why paths have mixed the \ / characters ? Yes, now I have done something like this: 1. I have cleaned the solution 2. I have deleted the C:\FS_GIT\libs\openssl-1.0.0a direcotry 3. I did not found anywhere the tar.gz for openssl, the only one which I have is the jpegsrc.v8d.tar.gz 4. Build the openssl project And still I receive the same error: cpt_err.c c1 : fatal error C1083: Cannot open source file: '..\..\openssl-1.0.0a\crypto\cpt_err.c': No such file or directory Which is in fact true, because there is no crypto folder in C:\FS_GIT\libs\openssl-1.0.0a. I have put the Output here: http://pastebin.com/6tCzy0pU !DSPAM:5135f23732761952219532!