1 files changed, 1 insertions, 0 deletions
diff --git a/extconf.rb b/extconf.rb
index 641b7c2..4eacab7 100644
--- a/extconf.rb
+++ b/extconf.rb
@@ -73,6 +73,7 @@ have_func("BN_mod_sub")
 have_func("BN_pseudo_rand_range")
 have_func("BN_rand_range")
 have_func("CONF_get1_default_config_file")
+have_func("ENGINE_add")
 have_func("EVP_CIPHER_CTX_copy")
 have_func("EVP_CIPHER_CTX_set_padding")
 have_func("EVP_CipherInit_ex")