The PostgreSQL 12.0 sources can be obtained from the download section of our website: https://www.postgresql.org/download/. You should get a file named
postgresql-12.0.tar.bz2. After you have obtained the file, unpack it:
tar xf postgresql-12.0.tar
bunzip2 instead of
gunzip if you have the
.bz2 file.) This will create a directory
postgresql-12.0 under the current directory with the PostgreSQL sources. Change into that directory for the rest of the installation procedure.
You can also get the source directly from the version control repository, see Appendix I.
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