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1. A decent ISO C++-11 compiler. GCC (version >= 4.9) is recommended.
-2. CLN library (http://www.ginac.de/CLN), version >= 1.2.2
+2. CLN library (https://www.ginac.de/CLN), version >= 1.2.2
3. CMake, version >= 2.8 (version 2.6.x might work too).
-4. Python, version >= 2.6
+4. Python 3
5. (optional) pkg-config utility (http://pkg-config.freedesktop.org)
6. (optional) bison (>= 2.3), flex (2.5.33), GNU readline (>= 4.3). These
are necessary to build ginsh, the GiNaC interactive shell, and can be