=== build of poc_oob.c on guest (unprivileged user maxx) ===
$ cd poc/DF-0619 && cc -Wall -O2 -o poc_oob poc_oob.c
(no output — clean compile)
BUILD_EXIT=0
$ ls -l poc_oob
-rwxr-xr-x  1 maxx  maxx  9824 Jul  3 03:40 poc_oob

=== build of poc_leak.c (stress variant) ===
$ cc -Wall -O2 -o poc_leak poc_leak.c
BUILD_EXIT=0

Both files compile cleanly with gcc 8.3 [DragonFly] on the audit guest.