To use this piece of code:

• Download FLTK and place the source tree into this, and name it "fltk". It should end up as: ./fltk
• cd ./fltk && ./configure --prefix="$(pwd)" && make -j8
• Now download latest CEF distribution and put it into this source tree as "cef". It should end up as: ./cef
• Create a folder named ./cef/Default, copy the contents of Release into that folder and magically build the cef_dll_wrapper, put it in there too.
• Make sure that gcc and g++ are in your path.
• ninja

Before re-building, I suggest using ninja clean first. Look at build.ninja for build instructions...its very obvious.