Add a warning that the user is using a development version.

2 files changed, 22 insertions, 0 deletions

diff --git a/README.md b/README.md
index caadad82d..89524e7e7 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
+### Important Notice
+
+The `master` branch contains the latest development version. If you are running
+a server then you probably want the `insp20` branch. You can obtain this from
+the [releases](https://github.com/inspircd/inspircd/releases) page or by running
+`git checkout insp20` if you are installing via Git.
+
 ### About
 
 InspIRCd is a modular Internet Relay Chat (IRC) server written in C++ for Linux,
diff --git a/configure b/configure
index 1ff8da63b..5873961ec 100755
--- a/configure
+++ b/configure
@@ -281,6 +281,21 @@ STOP
 	print "\e[0m\n\n";
 	print "The following compiler has been detected: \e[1;32m$cxx{NAME} $cxx{VERSION}\e[0m ($config{CXX})\n\n";
 
+	# Check that the user actually wants this version.
+	if (index($version, '+') != -1) {
+		print <<"EOW" ;
+\e[1;31mWARNING!\e[0m You are building a development version. This contains code which has
+not been tested as heavily and may contain various faults which could seriously
+affect the running of your server. It is recommended that you use a stable
+version instead.
+
+You can obtain the latest stable version from https://github.com/inspircd/inspircd/releases
+or by running `git checkout insp20` if you are installing from Git.
+
+EOW
+	exit 1 unless prompt_bool(1, 'I understand this warning and want to continue anyway.', 0);
+	}
+
 	# Directory Settings..
 	my $tmpbase = $config{BASE_DIR};
 	$config{BASE_DIR} = prompt_dir(1, 'What directory do you wish to install the InspIRCd base?', $config{BASE_DIR});