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
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