Index: ext/openssl/extconf.rb
--- ext/openssl/extconf.rb.orig
+++ ext/openssl/extconf.rb
@@ -151,6 +151,7 @@ have_func("HMAC_CTX_free")
 OpenSSL.check_func("RAND_pseudo_bytes", "openssl/rand.h") # deprecated
 have_func("X509_STORE_get_ex_data")
 have_func("X509_STORE_set_ex_data")
+have_func("X509_STORE_get_ex_new_index")
 have_func("X509_CRL_get0_signature")
 have_func("X509_REQ_get0_signature")
 have_func("X509_REVOKED_get0_serialNumber")
