As in the subject:
insets/InsetTabular.cpp: In member function ‘int
lyx::Tabular::TeXTopHLine(lyx::otexstream&, size_t, std::string) const’:
insets/InsetTabular.cpp:2068: error: ambiguous overload for ‘operator<<’
in
‘lyx::operator<<(((lyx::otexstream&)((lyx::otexstream*)lyx::operator<<(((lyx::otexstream&)((lyx::otexstream*)lyx::operator<<(((lyx::otexstream&)((lyx::otexstream*)os)),
((const char*)"\\expandafter")))), (((bool)((const
lyx::Tabular*)this)->lyx::Tabular::use_booktabs) ? ((const
char*)"\\cmidrule") : ((const char*)"\\cline"))))), ((const
char*)"\\expandafter{\\expandafter")) << ((c + offset) + 1u)’
./support/docstream.h:154: note: candidates are: lyx::otexstream&
lyx::operator<<(lyx::otexstream&, unsigned int)
./support/docstream.h:152: note: lyx::otexstream&
lyx::operator<<(lyx::otexstream&, int)
./support/docstream.h:150: note: lyx::otexstream&
lyx::operator<<(lyx::otexstream&, double)
./support/docstream.h:148: note: lyx::otexstream&
lyx::operator<<(lyx::otexstream&, char)
./support/docstream.h:146: note: lyx::otexstream&
lyx::operator<<(lyx::otexstream&, const char*) <near match>
./support/docstream.h:144: note: lyx::otexstream&
lyx::operator<<(lyx::otexstream&, const lyx::docstring&) <near match>
$ g++ --version
g++ (Ubuntu/Linaro 4.4.4-14ubuntu5) 4.4.5
T.