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Using glibc's version string to detect potential collation definition changes is not 100% reliable, but it's better than nothing. Currently this affects only collations explicitly provided by "libc". More work will be needed to handle the default collation. Author: Thomas Munro, based on a suggestion from Christoph Berg Reviewed-by: Peter Eisentraut Discussion: https://postgr.es/m/4b76c6d4-ae5e-0dc6-7d0d-b5c796a07e34%402ndquadrant.com