#include <pg_config.h>
/usr/include/pg_config-x86_64.h:#define PG_VERSION "9.6.9"
/usr/include/pg_config-x86_64.h:#define PG_VERSION_NUM 90609
/usr/include/pg_config-x86_64.h:#define PG_VERSION_STR "PostgreSQL 9.6.9 on
x86_64-redhat-linux-gnu, compiled by gcc (GCC) 7.3.1 20180303 (Red Hat
7.3.1-5), 64-bit"
I also have source for 8.4 and its there too.
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