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I have the same/simmilar problem on Fedora Core 9

WebBrowser.h:72:26: error: EmailMessage.h: No such file or directory
WebBrowser.h:118: error: ‘EmailMessage’ has not been declared
WebBrowser.h:122: error: expected ‘,’ or ‘...’ before ‘&’ token
WebBrowser.h:122: error: ISO C++ forbids declaration of ‘EmailAttachmentList’ with no type
ServiceClient.cpp: In function ‘UINT ServiceClientThread(void)’:
ServiceClient.cpp:438: error: expected type-specifier before ‘exception’
ServiceClient.cpp:438: error: expected )' before ‘&’ token ServiceClient.cpp:438: error: expected{' before ‘&’ token
ServiceClient.cpp:438: error: ‘e4’ was not declared in this scope
ServiceClient.cpp:438: error: expected ;' before ‘)’ token ServiceClient.cpp:443: error: expected primary-expression before ‘catch’ ServiceClient.cpp:443: error: expected;' before ‘catch’
make[1]:
** [ServiceClient.o] Error 1
make[1]: Leaving directory `/opt/1/yahoopops/src'

Is this project dead? It does need a new developer?
Also I would suggest switching to SVN from CVS.