ENH: Compile git with SSL support

Older versions of git included in older linux distributions are not able
to download source from Github. A newer version is required with a newer
OpenSSL. This requires to also build curl with the same OpenSSL.

CMake is downloaded precompiled if available (64bits system) or compiled
from source otherwise.

imagefiles/install-cmake-binary.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+set -ex
+
+if ! command -v curl &> /dev/null; then
+	echo >&2 'error: "curl" not found!'
+	exit 1
+fi
+
+if ! command -v tar &> /dev/null; then
+	echo >&2 'error: "tar" not found!'
+	exit 1
+fi
+
+if [[ "${CMAKE_VERSION}" == "" ]]; then
+  echo >&2 'error: CMAKE_VERSION env. variable must be set to a non-empty value'
+  exit 1
+fi
+
+cd /tmp
+
+filename=cmake-${CMAKE_VERSION}-Centos5-x86_64
+url=https://github.com/dockbuild/CMake/releases/download/v${CMAKE_VERSION}/${filename}.tar.gz
+echo "Downloading $url"
+curl -# -LO $url
+
+tar -xzvf ${filename}.tar.gz
+rm -f ${filename}.tar.gz
+
+cd ${filename}
+
+rm -rf doc man
+rm -rf bin/cmake-gui
+
+find . -type f -exec install -D "{}" "/usr/{}" \;