Hi.
When I include iostream I see this message:

gcc -I/usr/local/include -mwindows -DWIN32 -Wno-non-virtual-dtor -o main 
main.cpp -L/usr/local/lib /usr/local/lib/libfltk2.a -mwindows -lmsimg32 -lole32 
-luuid -lcomctl32 -lwsock32 -lsupc++
C:/Users/Adam/AppData/Local/Temp/ccuByvXf.o:main.cpp:(.text+0xd): undefined 
reference to `std::string::size() const'
C:/Users/Adam/AppData/Local/Temp/ccuByvXf.o:main.cpp:(.text+0x60): undefined 
reference to `std::string::operator[](unsigned int) const'
C:/Users/Adam/AppData/Local/Temp/ccuByvXf.o:main.cpp:(.text+0x9e): undefined 
reference to `std::string::operator[](unsigned int) const'
C:/Users/Adam/AppData/Local/Temp/ccuByvXf.o:main.cpp:(.text+0xcc): undefined 
reference to `std::string::operator[](unsigned int) const'
C:/Users/Adam/AppData/Local/Temp/ccuByvXf.o:main.cpp:(.text+0x1969): undefined 
reference to `std::ios_base::Init::Init()'
C:/Users/Adam/AppData/Local/Temp/ccuByvXf.o:main.cpp:(.text+0x1984): undefined 
reference to `std::ios_base::Init::~Init()'
collect2: ld returned 1 exit status

Why I get this message?
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