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Some systems don't ship with "python" by default anymore, only "python3" or "python2" or some combination, so include those in the configure search. Back-patch of commit 7291733ac. At the time that was only pushed back as far as v10, because of concerns about interactions with commit b21c569ce. Closer analysis shows that if we just s/AC_PATH_PROG/AC_PATH_PROGS/, there is no effect on the older branches' behavior when PYTHON is explicitly specified, so it should be okay to back-patch: this will not break any configuration that worked before. And the need to support platforms with only a "python3" or "python2" executable is getting ever more urgent. Original patch by Peter Eisentraut, back-patch analysis by me Discussion: https://www.postgresql.org/message-id/flat/1457.1543184081%40sss.pgh.pa.us#c9cc1199338fd6a257589c6dcea6cf8d