Asterisk 11 reaches End-of-Life (EOL) next week. Therefore, I recommend investigate this issue in more detail. In your folder ‘/tmp’, is there still the file ‘pjproject-2.6.tar.bz2’? If yes, please, remove that manually. Then, give (the non-certified) Asterisk 13 LTS a go. That variant does not build the PJProject on default. Therefore it should do. When ‘./configure’ works, try ‘./configure --with-pjproject-bundled’ and post the results! Perhaps you have a permission thing about your tmp folder? By the way, which version of CentOS are you using?