diff --git a/.travis.yml b/.travis.yml
index 40afd952b..f2b2a74b9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,9 @@ before_install:
 
 env:
   - ARCH=64 SOURCE_CHECK_ONLY=true COPTFLAGS="-O3"
+  - ARCH=32 SOURCE_CHECK_ONLY=true DEVELOPER=0
+  - ARCH=64 SOURCE_CHECK_ONLY=true DEVELOPER=0 COMPILER=gcc-4.8
+  - ARCH=64 SOURCE_CHECK_ONLY=true DEVELOPER=1 EXPERIMENTAL_FEATURES=1
 #  - VALGRIND=0 ARCH=32 DEVELOPER=1 COMPILER=gcc TEST_GROUP=1 TEST_GROUP_COUNT=2 SOURCE_CHECK_ONLY=false
 #  - VALGRIND=0 ARCH=32 DEVELOPER=1 COMPILER=gcc TEST_GROUP=2 TEST_GROUP_COUNT=2 SOURCE_CHECK_ONLY=false
   - VALGRIND=0 ARCH=64 DEVELOPER=1 COMPILER=gcc SOURCE_CHECK_ONLY=false
@@ -18,7 +21,6 @@ env:
 #  - VALGRIND=1 ARCH=64 DEVELOPER=0 COMPILER=gcc TEST_GROUP=2 TEST_GROUP_COUNT=3 SOURCE_CHECK_ONLY=false
 #  - VALGRIND=1 ARCH=64 DEVELOPER=0 COMPILER=gcc TEST_GROUP=3 TEST_GROUP_COUNT=3 SOURCE_CHECK_ONLY=false
   - VALGRIND=0 ARCH=64 DEVELOPER=1 COMPILER=clang SOURCE_CHECK_ONLY=false
-  - VALGRIND=0 ARCH=64 DEVELOPER=0 COMPILER=gcc-4.8 SOURCE_CHECK_ONLY=true
   - VALGRIND=1 ARCH=64 DEVELOPER=1 COMPILER=gcc TEST_GROUP=1 TEST_GROUP_COUNT=12 SOURCE_CHECK_ONLY=false
   - VALGRIND=1 ARCH=64 DEVELOPER=1 COMPILER=gcc TEST_GROUP=2 TEST_GROUP_COUNT=12 SOURCE_CHECK_ONLY=false
   - VALGRIND=1 ARCH=64 DEVELOPER=1 COMPILER=gcc TEST_GROUP=3 TEST_GROUP_COUNT=12 SOURCE_CHECK_ONLY=false
diff --git a/.travis/build.sh b/.travis/build.sh
index dab084671..f49381da9 100755
--- a/.travis/build.sh
+++ b/.travis/build.sh
@@ -5,6 +5,7 @@ CWD=$(pwd)
 export SLOW_MACHINE=1
 export CC=${COMPILER:-gcc}
 export DEVELOPER=${DEVELOPER:-1}
+export EXPERIMENTAL_FEATURES=${EXPERIMENTAL_FEATURES:-0}
 export SOURCE_CHECK_ONLY=${SOURCE_CHECK_ONLY:-"false"}
 export COMPAT=${COMPAT:-1}
 export PATH=$CWD/dependencies/bin:"$HOME"/.local/bin:"$PATH"