As recommended in https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#sort-multi-line-arguments

  "This helps to avoid duplication of packages and make the
  list much easier to update."

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 tests/docker/dockerfiles/centos7.docker | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/docker/dockerfiles/centos7.docker b/tests/docker/dockerfiles/centos7.docker
index 83462b7205..0a04bfbed8 100644
--- a/tests/docker/dockerfiles/centos7.docker
+++ b/tests/docker/dockerfiles/centos7.docker
@@ -18,10 +18,10 @@ ENV PACKAGES \
     libfdt-devel \
     librdmacm-devel \
     lzo-devel \
-    nettle-devel \
     make \
     mesa-libEGL-devel \
     mesa-libgbm-devel \
+    nettle-devel \
     pixman-devel \
     SDL-devel \
     spice-glib-devel \
-- 
2.18.0