C.W.Holeman II wrote:
> g++  hello.cxx ../Graph.cpp ../Simple_window.cpp   -lfltk_images  -lfltk
> 
> produces:
> 
> /tmp/ccBlyRgP.o: In function `main':
> hello.cxx:(.text+0x44): undefined reference to `fltk::Window::Window(int, 
> int, char const*)'
> hello.cxx:(.text+0x97): undefined reference to `fltk::Widget::Widget(int, 
> int, int, int, char const*)'
  [ ... more error messages elided ... ]
> collect2: ld returned 1 exit status

It looks as if the linker doesn't find the fltk libs. Usually there should
be something like "-L /path/to/fltk-libs" in your link line.

You'r obviously using FLTK 2, so please try:

fltk2-config --use-images --ldflags

to show the correct linker options and modify your linker line accordingly.

If you can't make it work, please ask again, and tell us how you
configured, compiled, linked, and installed your fltk libs (e.g.
./configure --prefix=... ?).


Albrecht
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