_fopen$UNIX2003 referenced from OpenSSL problem

I'm using compiled OpenSSL for an iPhone app. I followed the instructions here http://www.x2on.de/kontakt/ so I could develop rsa operation on iPhone simulator. The problem is that I get this error when building the project:

_fopen$UNIX2003 referenced from

_BIO_new_file开发者_如何学JAVA in libcrypto_i386.a(bss_file.o) _file_ctrl in libcrypto_i386.a(bss_file.o) Symbol(s) not found

Every time I invoke this function to get a public key:

RSA * d2i_RSAPublicKey(RSA **a, const unsigned char **pp, long length);

Some places point this is a version problem so I should build openssl for a different architecture (currently using iPhoneOS3.2.sdk), is that right?

Thanks for your comments.

Just create new *.c file and copy this code to it:

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

FILE *fopen$UNIX2003( const char *filename, const char *mode )
{
    return fopen(filename, mode);
}

int fputs$UNIX2003(const char *res1, FILE *res2){
    return fputs(res1,res2);
}

int nanosleep$UNIX2003(int val){
    return usleep(val);
}

char* strerror$UNIX2003(int errornum){
    return strerror(errornum);
}

double strtod$UNIX2003(const char *nptr, char **endptr){
    return strtod(nptr, endptr);
}

size_t fwrite$UNIX2003( const void *a, size_t b, size_t c, FILE *d )
{
    return fwrite(a, b, c, d);
}

Found this solution here: http://helpdesk.metaio.com/questions/35905/undefined-symbols-for-architecture-i386-xcode-6-ios-8-beta-6/36538

This and this both suggest for Mac OS X that your problem is two different components compiled for two different SDKs.

You should try cleaning the project's build output (make clean) and rebuilding everything with the same compiler/SDK.