Compiling tor from git returns: `src/common/tortls.c:1451: undefined reference to `SSL_CIPHER_find'` Latest commit on the git repo is, for reference: `90e07ab338cd59caeaeb31a3d207bb34d433b8ab` User 'mancha' on #tor helped me pin the problem. They supplied the following source code to test the SSL version currently in use: {{{#include <stdio.h> #include <openssl/crypto.h> #define OPENSSL_VER(a,b,c,d,e) \ (((a)<<28) | \ ((b)<<20) | \ ((c)<<12) | \ ((d)<< 4) | \ (e)) #define OPENSSL_V_SERIES(a,b,c) OPENSSL_VER((a),(b),(c),0,0) int main() { printf("OPENSSL_VERSION_NUMBER : %x\n", OPENSSL_VERSION_NUMBER); printf("OPENSSL_V_SERIES(1,0,2): %x\n", OPENSSL_V_SERIES(1,0,2)); return 0; } }}} Compiling with `cc -o foo foo.c -lcrypto` returns: ``` OPENSSL_VERSION_NUMBER : 20000000 OPENSSL_V_SERIES(1,0,2): 10002000 ``` Mancha also suggested the following patch: ``` --- a/src/common/tortls.c +++ b/src/common/tortls.c @@ -1440,7 +1440,7 @@ static int find_cipher_by_id(const SSL *ssl, const SSL_METHOD *m, uint16_t cipher) { const SSL_CIPHER *c; -#if OPENSSL_VERSION_NUMBER >= OPENSSL_V_SERIES(1,0,2) +#if 0 { unsigned char cipherid[3]; tor_assert(ssl); ``` Applying the patch makes tor compile successfully. **Trac**: **Username**: cwk