Hi all, I'm having some problems compiling the PJSIP libraries. I've been using PJSIP for quite some time and compiling it without problem but recently I'm getting this error message: /home/telnetdir/arqos/pjproject-0.8.0/pjsip/lib/libpjsip-i686-pc-linux-gnu.a(sip_transport_tls_ossl.o): In function `init_openssl': sip_transport_tls_ossl.o(.text+0x18e): undefined reference to `OPENSSL_add_all_algorithms_noconf' collect2: ld returned 1 exit status make[2]: *** [../bin/pjsua-i686-pc-linux-gnu] Error 1 make[2]: Leaving directory `/home/telnetdir/arqos/pjproject-0.8.0/pjsip-apps/build' make[1]: *** [pjsua] Error 2 make[1]: Leaving directory `/home/telnetdir/arqos/pjproject-0.8.0/pjsip-apps/build' make: *** [all] Error 1 I haven't done any changes in my operating system and this problem appears with all the versions of PJSIP (0.5.4, 0.7.0 and 0.8.0). Thanks for your help, Jorge Amador