title: Linker error on GLFW on linux (x11)
body: <p>I just installed GLFW3 on Ubuntu and I'm testing the example code from the documentation (<a href="http://www.glfw.org/documentation.html" rel="nofollow noreferrer">http://www.glfw.org/documentation.html</a>) and I got those errors.</p>
  
  <p>I tried multiples thing like adding -ldl, but nothing seems to work.</p>
  
  <p>Here is the error log (GCC):</p>
  
  <pre><code>g++  -o bin/Debug/Game obj/Debug/main.o  -ldl -lglfw3 -lm -lGL -lGLU  
  //usr/local/lib/libglfw3.a(vulkan.c.o): In function `_glfwInitVulkan':
  vulkan.c:(.text+0x42): undefined reference to `dlopen'
  vulkan.c:(.text+0xa9): undefined reference to `dlsym'
  //usr/local/lib/libglfw3.a(vulkan.c.o): In function `_glfwTerminateVulkan':
  vulkan.c:(.text+0x382): undefined reference to `dlclose'
  //usr/local/lib/libglfw3.a(vulkan.c.o): In function `glfwGetInstanceProcAddress':
  vulkan.c:(.text+0x72f): undefined reference to `dlsym'
  //usr/local/lib/libglfw3.a(x11_init.c.o): In function `translateKeyCode':
  x11_init.c:(.text+0x6a): undefined reference to `XkbKeycodeToKeysym'
  x11_init.c:(.text+0x14a): undefined reference to `XkbKeycodeToKeysym'
  x11_init.c:(.text+0x177): undefined reference to `XGetKeyboardMapping'
  x11_init.c:(.text+0x191): undefined reference to `XFree'
  //usr/local/lib/libglfw3.a(x11_init.c.o): In function `createKeyTables':
  x11_init.c:(.text+0xc3e): undefined reference to `XkbGetMap'
  x11_init.c:(.text+0xc61): undefined reference to `XkbGetNames'
  x11_init.c:(.text+0x137f): undefined reference to `XkbFreeNames'
  x11_init.c:(.text+0x1395): undefined reference to `XkbFreeKeyboard'
  //usr/local/lib/libglfw3.a(x11_init.c.o): In function `hasUsableInputMethodStyle':
  x11_init.c:(.text+0x14b2): undefined reference to `XGetIMValues'
  x11_init.c:(.text+0x150c): undefined reference to `XFree'
  //usr/local/lib/libglfw3.a(x11_init.c.o): In function `getSupportedAtom':
  x11_init.c:(.text+0x155b): undefined reference to `XInternAtom'
  //usr/local/lib/libglfw3.a(x11_init.c.o): In function `detectEWMH':
  x11_init.c:(.text+0x15ea): undefined reference to `XInternAtom'
  x11_init.c:(.text+0x1610): undefined reference to `XInternAtom'
  x11_init.c:(.text+0x1678): undefined reference to `XFree'
  x11_init.c:(.text+0x16a1): undefined reference to `XFree'
  x11_init.c:(.text+0x16ad): undefined reference to `XFree'
  x11_init.c:(.text+0x16be): undefined reference to `XFree'
  x11_init.c:(.text+0x16ca): undefined reference to `XFree'
  //usr/local/lib/libglfw3.a(x11_init.c.o):x11_init.c:(.text+0x190d): more undefined references to `XFree' follow
  //usr/local/lib/libglfw3.a(x11_init.c.o): In function `initExtensions':
  x11_init.c:(.text+0x194e): undefined reference to `dlopen'
  x11_init.c:(.text+0x1993): undefined reference to `dlsym'
  x11_init.c:(.text+0x19c1): undefined reference to `dlsym'
  x11_init.c:(.text+0x19ef): undefined reference to `dlsym'
  x11_init.c:(.text+0x1a1d): undefined reference to `dlsym'
  x11_init.c:(.text+0x1a8b): undefined reference to `dlopen'
  x11_init.c:(.text+0x1ad0): undefined reference to `dlsym'
  x11_init.c:(.text+0x1afe): undefined reference to `dlsym'
  x11_init.c:(.text+0x1b56): undefined reference to `XQueryExtension'
  x11_init.c:(.text+0x1bdf): undefined reference to `dlopen'
  x11_init.c:(.text+0x1c24): undefined reference to `dlsym'
  x11_init.c:(.text+0x1c52): undefined reference to `dlsym'
  x11_init.c:(.text+0x1c80): undefined reference to `dlsym'
  x11_init.c:(.text+0x1cae): undefined reference to `dlsym'
  x11_init.c:(.text+0x1cdc): undefined reference to `dlsym'
  //usr/local/lib/libglfw3.a(x11_init.c.o):x11_init.c:(.text+0x1d0a): more undefined references to `dlsym' follow
  //usr/local/lib/libglfw3.a(x11_init.c.o): In function `initExtensions':
  x11_init.c:(.text+0x214a): undefined reference to `dlopen'
  x11_init.c:(.text+0x218f): undefined reference to `dlsym'
  x11_init.c:(.text+0x21bd): undefined reference to `dlsym'
  x11_init.c:(.text+0x21eb): undefined reference to `dlsym'
  x11_init.c:(.text+0x220d): undefined reference to `dlopen'
  x11_init.c:(.text+0x2252): undefined reference to `dlsym'
  x11_init.c:(.text+0x2280): undefined reference to `dlsym'
  x11_init.c:(.text+0x22ae): undefined reference to `dlsym'
  x11_init.c:(.text+0x23b4): undefined reference to `XkbQueryExtension'
  x11_init.c:(.text+0x23f3): undefined reference to `XkbSetDetectableAutoRepeat'
  x11_init.c:(.text+0x2420): undefined reference to `dlopen'
  </code></pre>