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Using exit() requires stdlib.h, which is not included. Use return instead. Also add return type for main(). Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi> Reviewed-by: Thomas Munro <thomas.munro@enterprisedb.com> Backpatched because Apple macOS 10.16/11 (Big Sur) compiler makes calling undeclared functions an error, so these configure tests would fail. Reported-by: Thomas Gilligan <thomas.gilligan@icloud.com> Reported-by: Jesse Zhang <sbjesse@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://www.postgresql.org/message-id/flat/09A4B554-82B1-4536-B191-2461342EE0BB%40icloud.com