/opt/IBM/openxlC/17.1.1/bin/ibm-clang -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_types/reclen_t.c -o sys_types/reclen_t -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -latomic
sys_types/reclen_t.c:2:1: error: unknown type name 'reclen_t'
reclen_t* foo;
^
1 error generated.