+print OUT "/* opensslconf.h */\n";
+print OUT "/* WARNING: Generated automatically from opensslconf.h.in by Configure. */\n\n";
+
+print OUT "/* OpenSSL was configured with the following options: */\n";
+$openssl_algorithm_defines =~ s/^\s*#\s*define\s+(.*)/# ifndef $1\n# define $1\n# endif/mg;
+$openssl_algorithm_defines = " /* no ciphers excluded */\n" if $openssl_algorithm_defines eq "";
+$openssl_thread_defines =~ s/^\s*#\s*define\s+(.*)/# ifndef $1\n# define $1\n# endif/mg;
+$openssl_other_defines =~ s/^\s*#\s*define\s+(.*)/# ifndef $1\n# define $1\n# endif/mg;
+print OUT "#ifdef OPENSSL_ALGORITHM_DEFINES\n$openssl_algorithm_defines#endif\n";
+print OUT "#ifdef OPENSSL_THREAD_DEFINES\n$openssl_thread_defines#endif\n";
+print OUT "#ifdef OPENSSL_OTHER_DEFINES\n$openssl_other_defines#endif\n\n";
+