pg_config should print an error message to stderr and exit if an information item is not available.
pg_config should print an error message to stderr and exit if an
information item is not available.

tangp3/gpdb,tangp3/gpdb,50wu/gpdb,adam8157/gpdb,kmjungersen/PostgresXL,postmind-net/postgres-xl,50wu/gpdb,CraigHarris/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,tpostgres-projects/tPostgres,rubikloud/gpdb,chrishajas/gpdb,tangp3/gpdb,xuegang/gpdb,arcivanov/postgres-xl,xinzweb/gpdb,adam8157/gpdb,Quikling/gpdb,tangp3/gpdb,Chibin/gpdb,Chibin/gpdb,lpetrov-pivotal/gpdb,0x0FFF/gpdb,atris/gpdb,ovr/postgres-xl,0x0FFF/gpdb,rubikloud/gpdb,lisakowen/gpdb,ovr/postgres-xl,yazun/postgres-xl,atris/gpdb,arcivanov/postgres-xl,edespino/gpdb,cjcjameson/gpdb,randomtask1155/gpdb,greenplum-db/gpdb,rubikloud/gpdb,kaknikhil/gpdb,rubikloud/gpdb,jmcatamney/gpdb,rubikloud/gpdb,rubikloud/gpdb,0x0FFF/gpdb,lintzc/gpdb,lintzc/gpdb,ahachete/gpdb,CraigHarris/gpdb,janebeckman/gpdb,Quikling/gpdb,0x0FFF/gpdb,lisakowen/gpdb,kaknikhil/gpdb,royc1/gpdb,pavanvd/postgres-xl,zeroae/postgres-xl,yuanzhao/gpdb,ovr/postgres-xl,Chibin/gpdb,techdragon/Postgres-XL,randomtask1155/gpdb,CraigHarris/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,rubikloud/gpdb,Quikling/gpdb,rvs/gpdb,xinzweb/gpdb,chrishajas/gpdb,xuegang/gpdb,rvs/gpdb,snaga/postgres-xl,lintzc/gpdb,pavanvd/postgres-xl,xuegang/gpdb,zeroae/postgres-xl,pavanvd/postgres-xl,50wu/gpdb,xuegang/gpdb,arcivanov/postgres-xl,lintzc/gpdb,foyzur/gpdb,ashwinstar/gpdb,Quikling/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,randomtask1155/gpdb,lisakowen/gpdb,greenplum-db/gpdb,lisakowen/gpdb,rvs/gpdb,foyzur/gpdb,postmind-net/postgres-xl,rvs/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,lintzc/gpdb,Chibin/gpdb,lintzc/gpdb,zaksoup/gpdb,Quikling/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,xinzweb/gpdb,ahachete/gpdb,ahachete/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,0x0FFF/gpdb,chrishajas/gpdb,xinzweb/gpdb,lpetrov-pivotal/gpdb,xinzweb/gpdb,arcivanov/postgres-xl,rvs/gpdb,randomtask1155/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,lpetrov-pivotal/gpdb,janebeckman/gpdb,lpetrov-pivotal/gpdb,snaga/postgres-xl,rvs/gpdb,Quikling/gpdb,randomtask1155/gpdb,ahachete/gpdb,foyzur/gpdb,oberstet/postgres-xl,tangp3/gpdb,Quikling/gpdb,edespino/gpdb,jmcatamney/gpdb,edespino/gpdb,CraigHarris/gpdb,edespino/gpdb,greenplum-db/gpdb,rvs/gpdb,cjcjameson/gpdb,arcivanov/postgres-xl,50wu/gpdb,edespino/gpdb,kaknikhil/gpdb,atris/gpdb,jmcatamney/gpdb,randomtask1155/gpdb,ahachete/gpdb,foyzur/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,snaga/postgres-xl,chrishajas/gpdb,ashwinstar/gpdb,atris/gpdb,50wu/gpdb,edespino/gpdb,kaknikhil/gpdb,edespino/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,cjcjameson/gpdb,arcivanov/postgres-xl,oberstet/postgres-xl,tpostgres-projects/tPostgres,chrishajas/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,kmjungersen/PostgresXL,zaksoup/gpdb,xinzweb/gpdb,Chibin/gpdb,techdragon/Postgres-XL,tangp3/gpdb,xuegang/gpdb,ovr/postgres-xl,zaksoup/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,rvs/gpdb,rvs/gpdb,yuanzhao/gpdb,ahachete/gpdb,CraigHarris/gpdb,adam8157/gpdb,foyzur/gpdb,rubikloud/gpdb,cjcjameson/gpdb,lpetrov-pivotal/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,lisakowen/gpdb,Quikling/gpdb,Chibin/gpdb,snaga/postgres-xl,lintzc/gpdb,lisakowen/gpdb,royc1/gpdb,yazun/postgres-xl,postmind-net/postgres-xl,greenplum-db/gpdb,lintzc/gpdb,postmind-net/postgres-xl,xuegang/gpdb,rvs/gpdb,royc1/gpdb,ahachete/gpdb,ashwinstar/gpdb,techdragon/Postgres-XL,yuanzhao/gpdb,tpostgres-projects/tPostgres,50wu/gpdb,atris/gpdb,janebeckman/gpdb,0x0FFF/gpdb,zaksoup/gpdb,yazun/postgres-xl,Chibin/gpdb,atris/gpdb,kaknikhil/gpdb,adam8157/gpdb,janebeckman/gpdb,greenplum-db/gpdb,lisakowen/gpdb,Chibin/gpdb,ashwinstar/gpdb,atris/gpdb,yazun/postgres-xl,lintzc/gpdb,royc1/gpdb,randomtask1155/gpdb,snaga/postgres-xl,atris/gpdb,xuegang/gpdb,pavanvd/postgres-xl,ovr/postgres-xl,kmjungersen/PostgresXL,oberstet/postgres-xl,janebeckman/gpdb,Quikling/gpdb,tangp3/gpdb,janebeckman/gpdb,Chibin/gpdb,tpostgres-projects/tPostgres,royc1/gpdb,lpetrov-pivotal/gpdb,edespino/gpdb,50wu/gpdb,greenplum-db/gpdb,kmjungersen/PostgresXL,chrishajas/gpdb,royc1/gpdb,lpetrov-pivotal/gpdb,CraigHarris/gpdb,jmcatamney/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,50wu/gpdb,foyzur/gpdb,zeroae/postgres-xl,royc1/gpdb,adam8157/gpdb,ahachete/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,randomtask1155/gpdb,oberstet/postgres-xl,cjcjameson/gpdb,foyzur/gpdb,lisakowen/gpdb,ashwinstar/gpdb,kmjungersen/PostgresXL,cjcjameson/gpdb,royc1/gpdb,xinzweb/gpdb,tpostgres-projects/tPostgres,jmcatamney/gpdb,jmcatamney/gpdb,chrishajas/gpdb,yuanzhao/gpdb,zeroae/postgres-xl,tangp3/gpdb,yuanzhao/gpdb,lpetrov-pivotal/gpdb,zaksoup/gpdb,foyzur/gpdb,zaksoup/gpdb,xuegang/gpdb,janebeckman/gpdb,edespino/gpdb,kaknikhil/gpdb,edespino/gpdb,zaksoup/gpdb,janebeckman/gpdb,yazun/postgres-xl,yuanzhao/gpdb,0x0FFF/gpdb,zaksoup/gpdb,techdragon/Postgres-XL,chrishajas/gpdb,janebeckman/gpdb,CraigHarris/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,postmind-net/postgres-xl,Quikling/gpdb,xinzweb/gpdb,xuegang/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,Chibin/gpdb,adam8157/gpdb