🚀 go-pugleaf

Hi all, just wondering if anyone has any ideas about this.  Just come into 
work today and re-compiles a project that I've been working on for 2 months 
and all of a sudden I've got a whole host of complie errors.  The seem to be 
stemming from and in-house class that we use all the time.  We have many 
in-house class that are used for common tasks, the one in question is called 
TSystemTools.  It is pretty mucg used in every application we write, all of 
which still compile.  This particular project keeps kicking up the error:

[C++ Error] MAPI.h(30): E2141 Declaration syntax error

which seems to relate to the lines

#ifdef __cplusplus
extern "C" {
#endif

within mapi.h.  The TSystemTools class has a function that is used for 
sending e-mails to MAPI.hpp is included in it's header.  If I rem out that 
header and the fuction, I just get the same error relating to another header 
iptypes.h and so on.  Does anyone have any ideas.  I'm totally against the 
wall here.  Only thing I can think of is to strip the application down and 
re-build it from scratch - but this will literally take me two weeks :-(