check_cxx_source_compiles(
  "#include <openssl/crypto.h>
  #if __has_include(<openssl/ex_data.h>)
  #include <openssl/ex_data.h>
  #endif
  int main() {
  CRYPTO_EX_dup *cb = [] (CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from, void **from_d, int idx, long argl, void *argp) -> int { return 0; };
  return 0;
  }"
  HAVE_CRYPTO_EX_DUP_TYPE1
)