QtNetwork fails to build with OpenSSL support

I wanted to compile Qt 5.1.0 with OpenSSL support, therefore I did

configure -openssl -I G:\openssl-0.9.8h\include -L G:\openssl-0.9.8h\lib ...

... which was apparently understood by configure:

OpenSSL support.............yes
...
Include paths...............G:\openssl-0.9.8h\include 
Additional libraries........-LG:\openssl-0.9.8h\lib 

However building QtNetwork fails with "cannot find openssl/ssl.h". After looking at the makefiles in qtbase/src/network, the additional paths are clearly missing.

After patching the makefiles manually, QtNetwork compiles fine but then it fails at link stage with undefined references to all the QSsl* classes (QSslCertificate, QSslKey, QSslConfiguration, QSslCipher, QSslSocket, QSslError).

Is there any workaround that I could apply until this gets fixed? I really need to be able to compile Qt 5.1.0 with OpenSSL support.

Thank you.