OpenSSL 4.0 is in experimental. This package fails to build against it:

| gcc -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/osptoolkit-4.13.0=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -DOSP_ALLOW_DUP_TXN -DOSP_NO_DELETE_CHECK -DOSP_SDK -D_REENTRANT -D_POSIX_THREADS -DOPENSSL_NO_KRB5 -D_GNU_SOURCE -Iinclude -Ienroll -Itest  -Wall  -o enroll/osptneputil.o -c enroll/osptneputil.c
| libtool --mode=link gcc -Wl,-z,relro -Wl,-z,now -o bin/enroll enroll/osptnepinit.o enroll/osptnepenroll.o enroll/osptnep.o enroll/osptneputil.o lib/libosptk.la -lcrypto
| libtool: link: gcc -Wl,-z -Wl,relro -Wl,-z -Wl,now -o bin/.libs/enroll enroll/osptnepinit.o enroll/osptnepenroll.o enroll/osptnep.o enroll/osptneputil.o  lib/.libs/libosptk.so -lcrypto -pthread
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_register_DH'
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_register_RAND'
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_register_ciphers'
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_register_RSA'
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_register_digests'
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_get_next'
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_get_first'
| /usr/bin/x86_64-linux-gnu-ld.bfd: lib/.libs/libosptk.so: undefined reference to `ENGINE_load_builtin_engines'
| collect2: error: ld returned 1 exit status


Full buildlog
https://breakpoint.cc/openssl-rebuild/logs-4/attempted/osptoolkit_4.13.0-1.1_amd64-2026-04-19T09:15:34Z

Sebastian