Linker error with GLFW on OS 10.10 - opengl

Question

I'm trying to compile the following
#include <GLFW/glfw3.h>
int main()
{
glfwInit();
return 0;
}
just to verify that my GLFW installation is working. I use the terminal with
clang++ -framework Cocoa -framework OpenGL -framework IOKit -framework CoreVideo -I/opt/local/include/ test.c
but I receive a linker error for the glfwInit function:
Undefined symbols for architecture x86_64:
"_glfwInit", referenced from:
_main in test-d8c21e.o
ld: symbol(s) not found for architecture x86_64
I have installed glfw with sudo port install glfw and followed every possible tutorial I've found. I can verify that the libglfw.dylib file can be found at /opt/local/lib/ as (I think) it should.
Any suggestions?

Answer 1

You need to link with GLFW[3] as well, e.g., add:
-L/opt/local/lib -lglfw3
If you have the pkgconfig port installed, you can also take advantage of that with:
clang `pkg-config glfw3 --cflags` test.c -o test \
`pkg-config glfw3 --static --libs`
You may not need the --static flag if you have: libglfw3.dylib, as opposed to using: libglfw3.a, but it doesn't hurt.

Answer 2

If you are using Xcode, you must add the libglfw3.a library when linking binaries.
Heres the trick
Show hidden folders. Paste this into terminal: defaults write com.apple.finder AppleShowAllFiles YES
Relaunch a finder window and navigate to Macintosh HD\usr
Drag the usr folder to the "Favorites" side in the terminal
In xcode, click the add "+" to link binaries, then click "Add Other"
navigate to the libglfw3.a and add it!
If it still does not work, here are some instructions that helped me.
https://engineering-game-dev.com/2013/08/14/glfw-compiling-source-and-creating-an-xcode-project/comment-page-1/#comment-1400