diff --git a/.gitmodules b/.gitmodules
index e69de29b..8228ddc0 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "libCZI"]
+	path = libCZI
+	url = https://github.com/zeiss-microscopy/libCZI.git
diff --git a/libCZI b/libCZI
new file mode 160000
index 00000000..0922f1b1
--- /dev/null
+++ b/libCZI
@@ -0,0 +1 @@
+Subproject commit 0922f1b13582680b2c9801415f7368d17e8b360b
diff --git a/travis/build-wheels.sh b/travis/build-wheels.sh
index 27df5e31..61b80a38 100755
--- a/travis/build-wheels.sh
+++ b/travis/build-wheels.sh
@@ -5,8 +5,9 @@ set -e -x
 yum install -y libpng-devel zlib-devel
 
 # Install newer devtools that work on manylinux
-GCCAR=gcc-7.3-centos5-x86-64.tar.bz2
-curl -o ${GCCAR} -L https://github.com/Noctem/pogeo-toolchain/releases/download/v1.5/${GCCAR}
+GCCLOC=https://github.com/squeaky-pl/centos-devtools/releases/download/6.3
+GCCAR=gcc-6.3.0-binutils-2.27-x86_64.tar.bz2
+curl -o ${GCCAR} -L ${GCCLOC}/${GCCAR}
 tar xvjf ${GCCAR}
 export CC=/toolchain/bin/gcc
 export CXX=/toolchain/bin/g++