diff --git a/configure.ac b/configure.ac
index 4e14db23..d06be675 100644
--- a/configure.ac
+++ b/configure.ac
@@ -125,6 +125,7 @@ CTNG_CHECK_PROGS_REQ([bzip2], [bzip2])
 CTNG_CHECK_PROGS_REQ([xz], [xz])
 CTNG_CHECK_PROGS_REQ([unzip], [unzip])
 CTNG_CHECK_PROGS_REQ([help2man], [help2man])
+CTNG_CHECK_PROGS_REQ([file], [file])
 
 # Not a fatal failure even if we have neither - the tarballs may
 # be provided in a local directory.
diff --git a/testing/docker/centos7/Dockerfile b/testing/docker/centos7/Dockerfile
new file mode 100644
index 00000000..4f1e4dc3
--- /dev/null
+++ b/testing/docker/centos7/Dockerfile
@@ -0,0 +1,10 @@
+FROM centos:7
+ARG CTNG_UID
+ARG CTNG_GID
+RUN groupadd -g $CTNG_GID ctng
+RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
+RUN yum install -y autoconf gperf bison file flex texinfo help2man gcc-c++ libtool make patch \
+    ncurses-devel python-devel perl-Thread-Queue bzip2 git wget which xz unzip
+RUN wget -O /sbin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.1/dumb-init_1.2.1_amd64
+RUN chmod a+x /sbin/dumb-init
+ENTRYPOINT [ "/sbin/dumb-init", "--" ]