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You can consider this a follow-up question to How do I install the OpenSSL C++ library on Ubuntu? I'm trying to build some code on Ubuntu 10.04 LTS that requires OpenSSL 1.0.0. Ubuntu 10.04 LTS comes with OpenSSL 0.9.8k: $ openssl version OpenSSL 0.9.8k 25 Mar 2009 So after running sudo apt-get install libssl-dev and building, running ldd confirms I've linked in 0.9.8: $ ldd foo ... libssl.so.0.9.8 => /lib/i686/cmov/libssl.so.0.9.8 (0x00110000) ... libcrypto.so.0.9.8 => /lib/i686/cmov/libcrypto.so.0.9.8 (0x002b0000) ... How do I install OpenSSL 1.0.0 and the 1.0.0 development package? Update : I'm writing this update after reading SB 's answer (but before trying it), because it's clear I need to explain that the obvious solution of downloading and installing OpenSSL 1.0.0 doesn't work: After successfully doing the following (recommended in the INSTALL file): $ ./config $ make $ make test $ make install ...I still get: OpenSSL 0.9.8k 25 Mar 2009 ...and: $ sudo apt-get install libssl-dev Reading package lists... Done Building dependency tree Reading state information... Done libssl-dev is already the newest version. The following packages were automatically installed and are no longer required: linux-headers-2.6.32-21 linux-headers-2.6.32-21-generic Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. ...and (just to make sure) after rebuilding my code, ldd still returns the same thing. Update #2 : I added the "-I/usr/local/ssl/include" and "-L

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