GLFW error - GLFWwindow* not recognized as valid argument

GLFW error - GLFWwindow* not recognized as valid argument

I am trying to compile a program using GLFW as static library. I am sure
that I have linked everything properly, because other GLFW functions do
not throw any error. These are only functions using GLFWwindow* as a
parameter. For example:
glfwWindowMakeContextCurrent(window); //window is a pointer of type
GLFWwindow
This throws me an error. The argument window is invalid. Other functions
which expect a pointer to a GLFWwindow also throw errors. But the rest,
functions without GLFWwindow* as expected argument compile and work just
fine.
I am using MinGW32, Eclipse CDT, Win7. (I am sure that I use the 32bit GLFW)
What could be the reason, why he is not accepting my pointer?
P.S.: eclipse compiles glfwMakeContextCurrent(0); and as hint when I hover
the line with the error it shows me glfwMakeContextCurrent(*); <- no type,
just an asterisk