>From modules/tls/tls_init.c
```
/* attempt to guess if the library was compiled with kerberos or
* compression support from the cflags */
lib_cflags=SSLeay_version(SSLEAY_CFLAGS);
lib_kerberos=0;
lib_zlib=0;
if ((lib_cflags==0) || strstr(lib_cflags, "not available")){
lib_kerberos=-1;
lib_zlib=-1;
}else{
if (strstr(lib_cflags, "-DZLIB"))
lib_zlib=1;
if (strstr(lib_cflags, "-DKRB5_"))
lib_kerberos=1;
}
LOG(L_INFO, "tls: _init_tls_h: compiled with openssl version "
"\"%s\" (0x%08lx), kerberos support: %s,
compression: %s\n",
OPENSSL_VERSION_TEXT,
(long)OPENSSL_VERSION_NUMBER,
kerberos_support?"on":"off",
comp_support?"on":"off");
LOG(L_INFO, "tls: init_tls_h: installed openssl library version "
"\"%s\" (0x%08lx), kerberos support: %s, "
" zlib compression: %s"
"\n %s\n",
SSLeay_version(SSLEAY_VERSION), ssl_version,
(lib_kerberos==1)?"on":(lib_kerberos==0)?"off":"unknown",
(lib_zlib==1)?"on":(lib_zlib==0)?"off":"unknown",
SSLeay_version(SSLEAY_CFLAGS));
if (lib_kerberos!=kerberos_support){
if (lib_kerberos!=-1){
LOG(L_CRIT, "ERROR: tls: init_tls_h: openssl compile
options"
" mismatch: library has
kerberos support"
" %s and Kamailio tls %s
(unstable configuration)\n"
" (tls_force_run in
kamailio.cfg will override this"
" check)\n",
lib_kerberos?"enabled":"disabled",
kerberos_support?"enabled":"disabled"
);
if (cfg_get(tls, tls_cfg, force_run))
LOG(L_WARN, "tls: init_tls_h: tls_force_run
turned on, "
"ignoring kerberos support
mismatch\n");
else
return -1; /* exit, is safer */
}else{
LOG(L_WARN, "WARNING: tls: init_tls_h: openssl compile
options"
" missing -- cannot detect if
kerberos support is"
" enabled. Possible unstable
configuration\n");
}
}
```
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