Problem with QSslSocket

[dartanian]

I wrote a program in Qt 5.1 and it works good
but when i transfer it to v 4.8 and make dll from it, the program has error:
QSslSocket: cannot call unresolved function SSLv23_client_method
QSslSocket: cannot call unresolved function SSL_CTX_new
QSslSocket: cannot call unresolved function SSL_library_init
QSslSocket: cannot call unresolved function SSL_get_error

i dont know what is the problem

please help me
thanks

[ChrisW67]

You do not have OpenSSL libraries installed.