diff --git a/INSTALL.md b/INSTALL.md
index faeefdf67662b2f90fabe927ba476dd588b69bca..d9d7b24ec340bd1746b2f1a9b9a17114e6126f7b 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -34,15 +34,12 @@ First you need to install opam, then you may install Frama-C using opam.
 
 Several Linux distributions already include an `opam` package.
 
-**Note:** make sure your opam version is >= 2.0.0.
-
 macOS has opam through Homebrew.
 
 Windows users can install opam via WSL (Windows Subsystem for Linux).
 
-If your system does not have an opam package >= 2.0.0, you can
-[compile it from source](#compiling-from-source),
-or use the provided opam binaries available at:
+If your system does not have an opam package >= 2, you can use the provided
+opam binaries available at:
 
 http://opam.ocaml.org/doc/Install.html
 
@@ -62,15 +59,16 @@ its `depext` plug-in: issuing the two commands
 will install the appropriate system packages (this of course requires
 administrator rights on the system).
 
-If your system is not supported by `depext`, you will need to install
-Gtk, GtkSourceView, GnomeCanvas and GMP, including development libraries,
-separately. If you do so, please consider providing the system name and list of
-packages (e.g. via a [Gitlab issue](https://git.frama-c.com/pub/frama-c/issues/new))
-so that we can add it to the Frama-C `depext` package.
+If your system is not supported by `depext`, you can simply try:
 
-    # install Frama-C
     opam install frama-c
 
+If there are errors due to missing external dependencies, opam may emit a
+message indicating which packages to install. If this is not sufficient,
+there may be missing dependencies in opam's `depext` tool. In this case,
+you may [create a Gitlab issue](https://git.frama-c.com/pub/frama-c/issues/new)
+indicating your distribution and error message.
+
 ### Configuring provers for Frama-C/WP
 
 Frama-C/WP uses the [Why3](http://why3.lri.fr/) platform to run external provers
@@ -86,13 +84,13 @@ Most provers are available on all platforms. After their installation,
 Why3 must be configured to make them available for Frama-C/WP:
 
 ```shell
-why3 config --detect
+why3 config detect
 ```
 
 ### Reference configuration
 
 See file [reference-configuration.md](reference-configuration.md)
-for a set of packages that is known to work with Frama-C 22 (Titanium).
+for a set of packages that is known to work with Frama-C 23 (Vanadium).
 
 ### Installing Custom Versions of Frama-C
 
diff --git a/README.md b/README.md
index afae47f12d44ad2c2cefc5b26cfe7f5034592ec3..4a1fe8a9a018f880768f07f52f5aee199367bac5 100644
--- a/README.md
+++ b/README.md
@@ -28,23 +28,36 @@ properties. Plug-ins can also collaborate via their APIs.
 
 ## Installation
 
-For more detailed information about installing opam/Frama-C,
-see [INSTALL.md](INSTALL.md).
-
 Frama-C is available through [opam](http://opam.ocaml.org/), the
-OCaml package manager. This is the preferred installation method. Be sure
-to install opam v2.0 or higher. Then the following sequence of commands
-should install frama-c and its gui:
+OCaml package manager. If you have it, simply run:
 
-    opam init
-    opam install depext
-    opam depext frama-c
-    opam install frama-c
+    opam install depext # handles external (non-OCaml) dependencies
+    opam depext frama-c --install
 
 Frama-C is developed mainly in Linux, often tested in macOS
 (via Homebrew), and occasionally tested on Windows
 (via the Windows Subsystem for Linux).
 
+For detailed installation instructions and troubleshooting,
+see [INSTALL.md](INSTALL.md).
+
+### Development branch
+
+To install the development branch of Frama-C (updated nightly):
+
+    opam pin add frama-c https://git.frama-c.com/frama-c#master
+
+This command will *pin* the development version of Frama-C and try to install it.
+If installation fails due to missing external dependencies, try using
+the same commands from the [Installation](#installation) section to get the
+external dependencies and then install Frama-C.
+
+### Distribution packages
+
+Some Linux distributions have a `frama-c` package, kindly provided by
+distribution packagers. Note that they may not correspond to the latest
+Frama-C release.
+
 ## Usage
 
 Frama-C can be run from the command-line, or via its graphical interface.
diff --git a/bin/check-reference-configuration.sh b/bin/check-reference-configuration.sh
index 1c718e5ce4badcea43a6177eb253d446b85950f9..6557c2eca7defd285aebdb24afa512ccad39385e 100755
--- a/bin/check-reference-configuration.sh
+++ b/bin/check-reference-configuration.sh
@@ -65,5 +65,5 @@ if [ $has_any_diffs -ne 0 ]; then
     echo "    opam switch create ${working_ocaml}"
     echo "    opam install depext"
     echo "    opam depext --install$all_packages"
-    echo "    rm -f ~/.why3.conf && why3 config --detect"
+    echo "    rm -f ~/.why3.conf && why3 config detect"
 fi