Thread: BIO *PEM = BIO_new( BIO_s_mem() ); Doesn't compile?

Hi group,
This is a follow on to my other post:RSA key generate then encrypt/decrypt error
I am now tryin to create a public RSA to use to encrypt a message for a peer.
I found this helpful link:c - How to translate pem public key into openssl RSA* structure - Stack Overflow and wrote this function:

Code:

void
Make_RSA( RSA* RSA_Pair, RSA* RSA, char* Type )  {  // Makw_RSA

  int RC;

  // Extract Key from RSA Key pair
  BIO *BIO = BIO_new( BIO_s_mem() );
  
  if( strcmp( Type, "public" ) )  { 
     PEM_write_bio_RSAPrivateKey( BIO, RSA_Pair,
				  NULL, NULL, 0, NULL, NULL);  }
  else  {
     PEM_write_bio_RSAPublicKey(  BIO, RSA_Pair );  }

  size_t BIO_Len = BIO_pending( BIO );
  char *BIO_Key  = malloc( BIO_Len + 1  );
  RC = BIO_read( BIO, BIO_Key, BIO_Len );
  BIO_Key[ BIO_Len ] = '\0';

  // Let's see the data
  printf( BLUE  "BIO Key type %s\n" OFF, Type );
  Dump( (char*) BIO_Key, BIO_Len );

  // Now fill in to RSA
  BIO *PEM = BIO_new( BIO_s_mem() );
  PEM      = BIO_new_mem_buf( BIO_Key, BIO_Len );

  EVP_PKEY* EVP_PEM_Key = d2i_PUBKEY_bio( PEM, NULL);

  RSA = EVP_PKEY_get1_RSA( EVP_PEM_Key );

  // Free used memory
  EVP_PKEY_free( EVP_PEM_Key ) ;
  BIO_free( BIO );
  BIO_free( PEM );
  
  return;  }

But it will not compile?

gcc -I. -I/usr/include/openssl/ -g rsa.c -o myrsa -lcrypto && gdb myrsa
rsa.c: In function ‘Make_RSA’:
rsa.c:141:8: error: ‘PEM’ undeclared (first use in this function)
BIO *PEM = BIO_new( BIO_s_mem() );
^
rsa.c:141:8: note: each undeclared identifier is reported only once for each function it appears in

I have no idea what it is complaining about?

Can you see my problem?