[strongSwan] Undefined reference to OpenSSL function during SS 5.5.0 building !

[Tobias Brunner]

Hi,

> ../../src/libstrongswan/.libs/libstrongswan.so: undefined reference to
> `X509_get0_signature'
> How is to resolve this ?

According to the OpenSSL docs [1] this function was added with OpenSSL
1.0.2 (it is defined in crypto/asn1/x_x509.c).  Only if the OpenSSL
headers indicate a version lower than that is it substituted in the
openssl plugin.  So make sure the OpenSSL headers used during
compilation and the library used while linking actually match (it seems
you are linking against a version < 1.0.2).

Regards,
Tobias

[1] https://www.openssl.org/docs/manmaster/crypto/X509_get0_signature.html