diff --git a/.travis.yml b/.travis.yml
index e699d32..769a9ab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,10 +5,10 @@ script:
 - make -C auto clobber
 - make extensions
 - make dist-src
-#- make clean; SYSTEM=linux        make 
-#- make clean; SYSTEM=linux-osmesa make
-#- pushd build/cmake; git clean -xdf .; cmake -G 'Unix Makefiles' .                ; make; popd
-#- pushd build/cmake; git clean -xdf .; cmake -G 'Unix Makefiles' -DGLEW_OSMESA=1 .; make; popd
+- make clean; SYSTEM=linux        make 
+- make clean; SYSTEM=linux-osmesa make
+- pushd build/cmake; git clean -xdf .; cmake -G 'Unix Makefiles' .                ; make; popd
+- pushd build/cmake; git clean -xdf .; cmake -G 'Unix Makefiles' -DGLEW_OSMESA=1 .; make; popd
 addons:
   apt:
     packages: