There is workaround - not SSL VPN, but IPsec to GP.
It is possible to establish VPN IPsec to GP from Linux. We have used Ubuntu with vpnc (and additionaly GUI network-manager-vpnc).
From Linux side you should use "Compatible with Cisco VPN" option.
Form GP side (soft ver 4.1.6):
GlobalProtect-> Gateway -> General
Tunnel Mode -> Enable IPsec option on and Enable X-auth option on -> Group Name and password
Skip Auth on IKE Rekey option on
GlobalProtect - >Portal -> Client conf -> General
Third party vpn client -> add cisco systems vpn adapter
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