The inclusion of bn.h from the engine.h API header has been deprecated, so

the engine implementations need to include bn.h to manipulate bignums.

engines/e_4758_cca.c

@@ -62,6 +62,7 @@
 #include <openssl/engine.h>
 #include <openssl/rand.h>
 #include <openssl/rsa.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_4758_CCA

engines/e_aep.c

@@ -72,6 +72,7 @@ typedef int pid_t;
 #include <openssl/rsa.h>
 #include <openssl/dsa.h>
 #include <openssl/dh.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_AEP

engines/e_atalla.c

@@ -65,6 +65,7 @@
 #include <openssl/rsa.h>
 #include <openssl/dsa.h>
 #include <openssl/dh.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_ATALLA

engines/e_cswift.c

@@ -66,6 +66,7 @@
 #include <openssl/dsa.h>
 #include <openssl/dh.h>
 #include <openssl/rand.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_CSWIFT

engines/e_ncipher.c

@@ -67,6 +67,7 @@
 #include <openssl/rand.h>
 #include <openssl/rsa.h>
 #include <openssl/dh.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_NCIPHER

engines/e_nuron.c

@@ -65,6 +65,7 @@
 #include <openssl/rsa.h>
 #include <openssl/dsa.h>
 #include <openssl/dh.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_NURON

engines/e_sureware.c

@@ -60,6 +60,7 @@
 #include <openssl/rsa.h>
 #include <openssl/dsa.h>
 #include <openssl/dh.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_SUREWARE

engines/e_ubsec.c

@@ -67,6 +67,7 @@
 #include <openssl/rsa.h>
 #include <openssl/dsa.h>
 #include <openssl/dh.h>
+#include <openssl/bn.h>
 
 #ifndef OPENSSL_NO_HW
 #ifndef OPENSSL_NO_HW_UBSEC