compver is an ASCII file used to specify previous versions of the associated package which are upward compatible. It is created by a package developer.
Each line of the file specifies a previous version of the associated package with which the current version is backward compatible.
Since some packages may require installation of a specific version of another software package, compatibility information is extremely crucial. Consider, for example, a package called "A" which requires
version "1.0" of application "B" as a prerequisite for installation. If the customer installing "A" has a newer version of "B" (version 1.3), the compver file for "B" must indicate that
"1.3" is compatible with version "1.0" in order for the customer to install package "A".
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