Re: [fltk.general] Re: I just installed FLTK on Linux but I have a compile error

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Re: Re: I just installed FLTK on Linux but I have a compile error Albrecht Schlosser Oct 22, 2020

On 10/22/20 3:58 PM ken williams wrote:

It seems I can't compile it with g++ ...
I tried this:
g++ hello.cpp -o hello -I/usr/local/include -L/usr/local/lib -lfltk-lXext -lX11 -lm
and I get this:
/usr/bin/ld: /usr/local/lib/libfltk.a(Fl_X11_Window_Driver.cxx.o):undefined reference to symbol 'dlsym@@GLIBC_2.2.5' /usr/bin/ld: /usr/lib/libdl.so.2: error adding symbols: DSO missingfrom command line
     collect2: error: ld returned 1 exit status

Could someone tell me what I should add or change?

That particular error is (AFAICT) because you missed to include '-ldl'in your command.


A more general approach would be to use either

$ fltk-config --compile hello.cxx

and learn from the output which options you need or to use fltk-configto provide the necessary options for you, like this:


$ fltk-config --cxxflags
$ fltk-config --ld[static]flags

See docs and/or

$ fltk-config --help

for more info.

Thank you!


Welcome.

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