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I have an FLTK project that I finished in visual studios and it compiles absolutely fine. But when I use g++ to compile it it gives me this error:

Undefined first referenced symbol in file _ZN4ROMS9ROMS_Menu24read_recipes_ingredientsE6String /var/tmp//ccWVvonz.o _ZN4ROMS9ROMS_Menu12read_catprdsE6String /var/tmp//ccWVvonz.o _ZN4ROMS9ROMS_Menu11Read_ordersE6String /var/tmp//ccWVvonz.o ld: fatal: Symbol referencing errors. No output written to a.out

I'm using a shell file with the following instructions to compile my project:

/opt/csw/gcc4/bin/g++ -Wno-deprecated -I/opt/csg/include main.cpp Graph.cpp GUI.cpp Window.cpp -L/opt/csw/gcc4/lib/libstdc++.a:/opt/csg/lib -lX11 /opt/csw/lib/libjpeg.so.62 /opt/csg/lib/libfltk.a /opt/csg/lib/libfltk_images.a

Again compiles fine in VS but problems in g++. I don't even understand the error, any help is appreciated, thanks. Will post any code if needed.

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Undefined symbol means that you compiled by referencing a declaration, but the linker could not find the definition.

I'm not entirely sure what I'm looking at either from the message. Either you are missing the symbols in ROMS or that is where they were referenced.

_ZN4ROMS9ROMS_Menu24read_recipes_ingredientsE6String

Guessing at the demangling...

ROMS::ROMS_Menu::read_recipes_ingredients::String

You may not have included a file?

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