Undefined reference to `_imp__glewInit@0'

Question

I have built the glew lib so many times. My last build removed the undefined references to all the shader functions such as glCreateShader(). I think this build

Answer 1

In Ubuntu 18.04 to work OpenGL the GLEW should be installed:

apt-get install libglew-dev   

And it works when add linker option: "-lGLEW" to linker call, like in the Makefile for the FLTK:

...
# HOW TO LINK
.o$(EXEEXT):
  @echo "*** Linking $@..."
  $(CXX) $< $(LINKFLTK_ALL) -lGLEW -o $@