Undefined symbols for architecture x86_64 about cimg

[devernay]

did you use this compile line:

clang++ -I .. -I /opt/X11/include captcha.cpp -L /opt/X11/lib -lX11 -o captcha

[dtschump]

Looks like you forgot to link your code with the X11 library:

$ g++ -o foo foo.cpp -lX11 -lpthread

or, if you don't have X11 installed and if you don't want display capabilities of CImg:

$ g++ -o foo foo.cpp -Dcimg_display=0

[lukywong]

Thank you, all ok after installing x11

[caiyzik]

I tried doing this to no avail. I also used -L/opt/X11 and I still get the same errors

[devernay]

@trmontgomery did you install xquartz ? (google it)

[caiyzik]

@devernay Yes I did.

[caiyzik]

@devernay Wow that worked! Any idea on why I can't compile with g++? (Edit: Apparently the gcc that comes with Mac is just clang...)