--- a/contrib/docker/centos5	Thu Aug 24 18:40:30 2017 +0200
+++ b/contrib/docker/centos5	Sun Oct 01 01:02:22 2017 +0200
@@ -1,9 +1,23 @@
 FROM centos:centos5
-RUN sed -i 's/^mirrorlist/#mirrorlist/' /etc/yum.repos.d/*.repo
-RUN sed -i 's/^#\(baseurl=\)http:\/\/mirror.centos.org\/centos/\1http:\/\/vault.centos.org/' /etc/yum.repos.d/*.repo
-RUN sed -i 's/\$releasever/5.11/' /etc/yum.repos.d/*.repo
-RUN yum install -y gcc make rpm-build gettext tar
-RUN yum install -y python-devel python-docutils
+RUN \
+	sed -i 's/^mirrorlist/#mirrorlist/' /etc/yum.repos.d/*.repo && \
+	sed -i 's/^#\(baseurl=\)http:\/\/mirror.centos.org\/centos/\1http:\/\/vault.centos.org/' /etc/yum.repos.d/*.repo && \
+	sed -i 's/\$releasever/5.11/' /etc/yum.repos.d/*.repo
+
+RUN yum install -y \
+	gcc \
+	gettext \
+	make \
+	python-devel \
+	python-docutils \
+	rpm-build \
+	tar
+
 # For creating repo meta data
-RUN yum install -y createrepo
-RUN yum install -y readline-devel openssl-devel ncurses-devel zlib-devel bzip2-devel
+RUN yum install -y \
+	bzip2-devel \
+	createrepo \
+	ncurses-devel \
+	openssl-devel \
+	readline-devel \
+	zlib-devel