diff --git a/.travis.yml b/.travis.yml
index 60697f01..fe8d26f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,10 +14,11 @@ matrix:
           packages:
             - g++-5
             - libjpeg8-dev
+            - libpng-dev
             - libasound2-dev
             - alsa-utils
             - alsa-oss
-          sources: &sources
+          sources: 
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise
             - llvm-toolchain-precise-3.7
@@ -28,10 +29,55 @@ matrix:
           packages:
             - g++-4.9
             - libjpeg8-dev
+            - libpng-dev
             - libasound2-dev
             - alsa-utils
             - alsa-oss
-          sources: *sources
+          sources: 
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise
+            - llvm-toolchain-precise-3.7
+            - llvm-toolchain-precise-3.6
+    - env: CXX=clang++-3.8 CC=clang-3.8
+      addons:
+        apt:
+          packages:
+            - clang-3.8
+            - g++-5
+            - libjpeg8-dev
+            - libpng-dev
+            - libasound2-dev
+            - alsa-utils
+            - alsa-oss
+          sources: 
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise 
+    - env: CXX=clang++-3.7 CC=clang-3.7
+      addons:
+        apt:
+          packages:
+            - clang-3.7
+            - libjpeg8-dev
+            - libpng-dev
+            - libasound2-dev
+            - alsa-utils
+            - alsa-oss
+          sources: 
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.7
+    - env: CXX=clang++-3.6 CC=clang-3.6
+      addons:
+        apt:
+          packages:
+            - clang-3.6
+            - libjpeg8-dev
+            - libpng-dev
+            - libasound2-dev
+            - alsa-utils
+            - alsa-oss
+          sources: 
+            - ubuntu-toolchain-r-test
+            - llvm-toolchain-precise-3.6
 
 before_install:
   - export PATH="$HOME/bin:$PATH"
@@ -47,5 +93,6 @@ before_script :
   - cd bld
 
 script:
-  - cmake -G"Unix Makefiles" .. -DENABLE_JPEG=ON
+  - cmake -G"Unix Makefiles" .. -DENABLE_JPEG=ON -DENABLE_PNG=OFF
+  #-DENABLE_JPEG=ON -DENABLE_PNG=ON
   - make