Hi @simonmichal,
The same for me:
```
│ [log in to unmask] grep -r DH_compute_key_padded . ✔ │ 14:05:47
./dh.h:int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
│ [log in to unmask]
```
I think the problem is that `DH_compute_key_padded` is declared as nonstatic and you have implemented it as static in xrootd ?:
```
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:140:12: error: static declaration of 'DH_compute_key_padded' follows non-static declaration
static int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh)
^
[log in to unmask]:153:5: note: previous declaration is here
int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
^
```
See more in VERBOSE mode:
```
[ 97%] Building CXX object src/CMakeFiles/XrdCryptossl-5.dir/XrdCrypto/XrdCryptosslCipher.cc.o
cd /Users/oshadura/CERN_sources/xrootd/builds/src && /Library/Developer/CommandLineTools/usr/bin/c++ -DHAVE_ATOMICS -DHAVE_CRYPT -DHAVE_CURL_MULTI_WAIT -DHAVE_FSTATAT -DHAVE_GETIFADDRS -DHAVE_LIBZ -DHAVE_NAMEINFO -DHAVE_READLINE -DHAVE_SSL -DHAVE_STRLCPY -DHAVE_XML2 -DHAVE_XRDCRYPTO -DLT_MODULE_EXT=\".dylib\" -DXRDPLUGIN_SOVERSION=\"5\" -DXrdCryptossl_5_EXPORTS -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I/Users/oshadura/CERN_sources/xrootd/src/.. -I/Users/oshadura/CERN_sources/xrootd/src/. -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk/usr/include/uuid -I/Users/oshadura/CERN_sources/xrootd/src -I/Users/oshadura/CERN_sources/xrootd/builds/src -I/usr/local/include [log in to unmask] -I/Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/System/Library/Frameworks/Kerberos.framework/Headers -Wno-deprecated-declarations -O2 -g -DNDEBUG -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk -fPIC -std=gnu++14 -MD -MT src/CMakeFiles/XrdCryptossl-5.dir/XrdCrypto/XrdCryptosslCipher.cc.o -MF CMakeFiles/XrdCryptossl-5.dir/XrdCrypto/XrdCryptosslCipher.cc.o.d -o CMakeFiles/XrdCryptossl-5.dir/XrdCrypto/XrdCryptosslCipher.cc.o -c /Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:140:12: error: static declaration of 'DH_compute_key_padded' follows non-static declaration
static int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh)
^
[log in to unmask]:153:5: note: previous declaration is here
int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
^
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:143:12: error: member access into incomplete type 'DH' (aka 'dh_st')
rv = dh->meth->compute_key(key, pub_key, dh);
^
[log in to unmask]:104:16: note: forward declaration of 'dh_st'
typedef struct dh_st DH;
^
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:146:26: error: member access into incomplete type 'DH' (aka 'dh_st')
pad = BN_num_bytes(dh->p) - rv;
^
[log in to unmask]:104:16: note: forward declaration of 'dh_st'
typedef struct dh_st DH;
^
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:541:35: error: call to 'DH_compute_key_padded' is ambiguous
ltmp = DH_compute_key_padded((unsigned char *)ktmp,bnpub,fDH);
^~~~~~~~~~~~~~~~~~~~~
[log in to unmask]:153:5: note: candidate function
int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
^
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:140:12: note: candidate function
static int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh)
^
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:715:23: error: call to 'DH_compute_key_padded' is ambiguous
ltmp = DH_compute_key_padded((unsigned char *)ktmp,bnpub,fDH);
^~~~~~~~~~~~~~~~~~~~~
[log in to unmask]:153:5: note: candidate function
int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
^
/Users/oshadura/CERN_sources/xrootd/src/XrdCrypto/XrdCryptosslCipher.cc:140:12: note: candidate function
static int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh)
^
5 errors generated.
make[2]: *** [src/CMakeFiles/XrdCryptossl-5.dir/XrdCrypto/XrdCryptosslCipher.cc.o] Error 1
make[1]: *** [src/CMakeFiles/XrdCryptossl-5.dir/all] Error 2
make: *** [all] Error 2
```
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