Found the following significant warnings:
  init.c:13:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  pki-x509.c:20:14: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  pki-x509.c:185:11: warning: 'EVP_PKEY_get1_RSA' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:188:8: warning: 'i2d_RSAPrivateKey' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:193:8: warning: 'i2d_RSAPrivateKey' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:201:8: warning: 'i2d_RSA_PUBKEY' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:206:8: warning: 'i2d_RSA_PUBKEY' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:399:11: warning: 'EVP_PKEY_get1_RSA' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:402:11: warning: 'RSA_public_encrypt' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:445:11: warning: 'EVP_PKEY_get1_RSA' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:448:11: warning: 'RSA_private_decrypt' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:486:2: warning: 'MD5' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:530:11: warning: 'EVP_PKEY_get1_RSA' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:533:9: warning: 'RSA_sign' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:571:11: warning: 'EVP_PKEY_get1_RSA' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:576:10: warning: 'RSA_verify' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:592:8: warning: 'd2i_RSAPrivateKey' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:596:2: warning: 'EVP_PKEY_assign' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:618:11: warning: 'd2i_RSA_PUBKEY' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:622:5: warning: 'EVP_PKEY_assign' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:639:11: warning: 'RSA_new' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:645:13: warning: 'RSA_free' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:649:6: warning: 'RSA_generate_key_ex' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:651:6: warning: 'RSA_free' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:659:5: warning: 'EVP_PKEY_assign' is deprecated [-Wdeprecated-declarations]
  pki-x509.c:818:21: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
  register.c:32:28: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
See '/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/PKI.Rcheck/00install.out' for details.