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On EasyPeasy 1.1 (for mini notebooks) derived from Ubuntu I installed g++ using apt-get:
$ apt-get install g++
One of the lines displayed was:
Setting up g++ (4:4.3.1-1ubuntu2) ...
What the does “4:” mean?
$ g++ --version
g++ (Ubuntu 4.3.2-1ubuntu12) 4.3.2
What is the relationship of the “4.3.1” in apt-get to the “4.3.2” g++ version?
It is an epoch. According to the debian policy manual,
IIRC gcc 3.4.x introduced ABI-incompatible changes from the 3.3.x series, and this epoch may have been introduced by debian maintainers at that time.