HI, I was wondering if someone already has seen these warnings on Debian 10 (PostgreSQL 13.1): ../../../../src/include/port.h:176:70: warning: 'format' attribute argument not supported: gnu_printf [-Wignored-attributes] extern int pg_snprintf(char *str, size_t count, const char *fmt,...) pg_attribute_printf(3, 4); ^ ../../../../src/include/c.h:127:49: note: expanded from macro 'pg_attribute_printf' #define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a))) ^ In file included from llvmjit_error.cpp:19: In file included from ../../../../src/include/postgres.h:46: In file included from ../../../../src/include/c.h:1318: ../../../../src/include/port.h:178:55: warning: 'format' attribute argument not supported: gnu_printf [-Wignored-attributes] extern int pg_sprintf(char *str, const char *fmt,...) pg_attribute_printf(2, 3); ^ ../../../../src/include/c.h:127:49: note: expanded from macro 'pg_attribute_printf' #define pg_attribute_printf(f,a) __attribute__((format(PG_PRINTF_ATTRIBUTE, f, a))) ^ In file included from llvmjit_error.cpp:19: In file included from ../../../../src/include/postgres.h:46: In file included from ../../../../src/include/c.h:1318: ../../../../src/include/port.h:180:58: warning: 'format' attribute argument not supported: gnu_printf [-Wignored-attributes] extern int pg_fprintf(FILE *stream, const char *fmt,...) pg_attribute_printf(2, 3); ^ Configure was successful: ... configure: creating ./config.status config.status: creating GNUmakefile config.status: creating src/Makefile.global config.status: creating src/include/pg_config.h config.status: creating src/include/pg_config_ext.h config.status: creating src/interfaces/ecpg/include/ecpg_config.h config.status: linking src/backend/port/tas/dummy.s to src/backend/port/tas.s config.status: linking src/backend/port/posix_sema.c to src/backend/port/pg_sema.c config.status: linking src/backend/port/sysv_shmem.c to src/backend/port/pg_shmem.c config.status: linking src/include/port/linux.h to src/include/pg_config_os.h config.status: linking src/makefiles/Makefile.linux to src/Makefile.port This is the official Debian AMI on AWS: postgres@pg13:~/postgresql-13.1$ cat /etc/debian_version 10.8 Regards Daniel