C Openssl / X509_up_ref

When compiling isync-1.4.4, I get:

socket.c:292:6: warning: implicit declaration of function 'X509_up_ref'; did you mean 'X509_free'? [-Wimplicit-function-declaration]

292 | X509_up_ref( cert ); // Locking failure assumed impossible

| ^~~~~~~~~~~

| X509_free

and later

isync-1.4.4/src/socket.c:292: undefined reference to `X509_up_ref'
collect2: error: ld returned 1 exit status
*** Error code 1

Stop.
make[2]: stopped in /usr/opt/src/isync-1.4.4/src
*** Error code 1

Stop.
make[1]: stopped in /usr/opt/src/isync-1.4.4
*** Error code 1

Stop.
make: stopped in /usr/opt/src/isync-1.4.4

Does this function exist?

Thanks for any hint!
 
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