diff --git a/.travis.yml b/.travis.yml
index 38629ab..3f5f0f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,17 @@ os:
  - osx
 
 matrix:
+ include:
+  -os: linux
+    addons:
+      apt:
+        sources:
+          - george-edison55-precise-backports # cmake 3.2.3 / doxygen 1.8.3
+        packages:
+          - cmake
+          - cmake-data
+          - lcov
+          - curl
  allow_failures:
     - os: osx
 
@@ -33,15 +44,5 @@ before_install:
 
 install: true
 
-addons:
-  apt:
-    sources:
-      - george-edison55-precise-backports # cmake 3.2.3 / doxygen 1.8.3
-    packages:
-      - cmake
-      - cmake-data
-      - lcov
-      - curl
-
 after_success:
   - bash <(curl -s https://codecov.io/bash)
diff --git a/src/os/unix/graphics.c b/src/os/unix/graphics.c
index 8cdcaaa..40c7be0 100644
--- a/src/os/unix/graphics.c
+++ b/src/os/unix/graphics.c
@@ -59,10 +59,10 @@ void GLWindowInit(GLWindow *g)
 
 void ShowScreen(GLWindow *g, int w, int h)
 {
-   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, g->videoTexture);
+   glBindTexture(GL_TEXTURE_RECTANGLE, g->videoTexture);
 
    // glTexSubImage2D is faster when not using a texture range
-   glTexSubImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, 0, 0, w, h, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, g->videoMemory);
+   glTexSubImage2D(GL_TEXTURE_RECTANGLE, 0, 0, 0, w, h, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, g->videoMemory);
    glBegin(GL_QUADS);
 
    glTexCoord2f(0.0f, 0.0f);
@@ -100,20 +100,20 @@ void setupGL(GLWindow *g, int w, int h)
    glLoadIdentity();
 
    glDisable(GL_TEXTURE_2D);
-   glEnable(GL_TEXTURE_RECTANGLE_ARB);
-   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, g->videoTexture);
+   glEnable(GL_TEXTURE_RECTANGLE);
+   glBindTexture(GL_TEXTURE_RECTANGLE, g->videoTexture);
 
    //  glTextureRangeAPPLE(GL_TEXTURE_RECTANGLE_NV_EXT, 0, NULL);
 
    //  glTexParameteri(GL_TEXTURE_RECTANGLE_NV_EXT, GL_TEXTURE_STORAGE_HINT_APPLE , GL_STORAGE_CACHED_APPLE);
    //  glPixelStorei(GL_UNPACK_CLIENT_STORAGE_APPLE, GL_TRUE);
-   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-   glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+   glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+   glTexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 
-   glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, w,
+   glTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA, w,
                 h, 0, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, g->videoMemory);
 
    glDisable(GL_DEPTH_TEST);
@@ -136,7 +136,7 @@ void restoreGL(GLWindow *g, int w, int h)
    glLoadIdentity();
 
    glDisable(GL_TEXTURE_2D);
-   glEnable(GL_TEXTURE_RECTANGLE_ARB);
+   glEnable(GL_TEXTURE_RECTANGLE);
    glDisable(GL_DEPTH_TEST);
 }