Linker error compiling keyczar program - c++

Question

I am using g++ -lkeyczar -lcrypto -o basic_encrypt -Wall -O2 base_encrypt.cpp to compile the following code:
#include <cassert>
#include <iostream>
#include <string>
#include <keyczar/keyczar.h>
void EncryptAndDecrypt(const std::string& location) {
keyczar::Keyczar* crypter = keyczar::Crypter::Read(location);
if (!crypter)
return;
std::string input = "Secret message";
std::string ciphertext;
std::cout << "Plaintext: " << input << std::endl;
bool result = crypter->Encrypt(input, &ciphertext);
if (result) {
std::cout << "Ciphertext (Base64w): " << ciphertext << std::endl;
std::string decrypted_input;
bool result = crypter->Decrypt(ciphertext, &decrypted_input);
if (result)
assert(input == decrypted_input);
}
delete crypter;
}
int main(int argc, char** argv) {
if (argc != 2) {
std::cout << "An absolute key set location must be provided as argument"
<< std::endl;
return 1; // error
}
// The first argument must represent the keyset's location
const std::string location(argv[1]);
EncryptAndDecrypt(location);
return 0;
}
Which is a tutorial taken from here
However, I am running into the following error:
/tmp/ccNlack3.o: In function `EncryptAndDecrypt(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)':
base_encrypt.cpp:(.text+0xf): undefined reference to `keyczar::Crypter::Read(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
collect2: ld returned 1 exit status
I am unable to solve this since I know that I am already giving the library flags while compiling. Why is it still unable to link correctly ?

Answer 1

Put the library flags at the end of the command line:
g++ -o basic_encrypt -Wall -O2 base_encrypt.cpp -lkeyczar -lcrypto