issues with SFL and Solaris 2.7 SC5.0 Compiler

Dear all 
I am attempting to build the SFL S/MIME install on a Solaris 2.7 box
using Sun Workshop 5.0 
However there seems to be a few issues in terms of : 

iostream/istream/ostream header includes need updating in asn_config.h
where the std names have changed. 

The multiple inheritance of CSM_CommonData in SMIME/include/sm_api.h
into CSM_MsgToAddSignatures via CSM_MsgToVerify and CSM_MsgToSign causes
compilation errors due to ? strict C++ checking causing the compiler to
look for CSM_CommonData::UpdateEncodedBlob( CSM_MsgToAddSignatures,
CSMContent*) methods rather than resolve the
CSM_CommonData::UpdateEncodedBlob( CSM_Content* ) method as expected. 
And this is just in the header file for the ctors. 
There is also the issue where I've had to insert the (int) cast in
sm_Attr.cpp: 1557 & (?)950-ish because of stricter type checking.
e.g. in 'if(*SnaccRR.receiptsFrom->allOrFirstTier == (int)
AllOrFirstTier::firstTierRecipients)' 

I'm flagging these because they may also turn up when the newer version
of gcc arrives this year. 

Currently I'm stuck on a compiler error in the same vein which throws
out *pCSM_MsgToAddSignatures.MsgToSign::SetContentBlob( CSM_Content* )
which again the compiler refuses to acknowledge  - looking for a method
of signature 'MsgToSign::SetContentBlob( CSM_MsgToAddSignatures,
CSM_Content* )';

All these are from the latest releases from the  SFL site - version 1.9
etc. 
I'd be appreciative of any help here..
Cheers
Mike