OpenSSL 4.0 is in experimental. This package fails to build against it:
| -Wall -Wundef -Wdeclaration-after-statement -Wimplicit-fallthrough -Wmissing-field-initializers -Wmissing-prototypes -Wstrict-prototypes -Wunused-parameter -Wvla -Wno-deprecated-declarations -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/fsverity-utils-1.6=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wl,-z,relro -Wl,-z,now -L. -lfsverity
| /usr/bin/x86_64-linux-gnu-ld.bfd: ./libfsverity.so: undefined reference to `ENGINE_init'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ./libfsverity.so: undefined reference to `ENGINE_ctrl_cmd_string'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ./libfsverity.so: undefined reference to `ENGINE_load_dynamic'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ./libfsverity.so: undefined reference to `ENGINE_free'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ./libfsverity.so: undefined reference to `ENGINE_finish'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ./libfsverity.so: undefined reference to `ENGINE_by_id'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ./libfsverity.so: undefined reference to `ENGINE_load_private_key'
| collect2: error: ld returned 1 exit status
Full buildlog
https://breakpoint.cc/openssl-rebuild/logs-4/attempted/fsverity-utils_1.6-1.2_amd64-2026-04-19T08:44:27Z
Sebastian