diff --git a/bin/foamInstallationTest b/bin/foamInstallationTest
index de9659c7a2..ce688b3ba2 100755
--- a/bin/foamInstallationTest
+++ b/bin/foamInstallationTest
@@ -35,7 +35,7 @@
 #------------------------------------------------------------------------------
 
 # Base settings
-MIN_VERSION_GCC=4.8.0
+MIN_VERSION_GCC=4.8.5
 
 # General
 WIDTH=20
diff --git a/doc/Config.md b/doc/Config.md
index 44dd63fa2e..5cb541b344 100644
--- a/doc/Config.md
+++ b/doc/Config.md
@@ -17,14 +17,15 @@ These source the following files in the `config.sh/` or
 * `scotch` : application settings for compiling against scotch
 * `metis` : application settings for compiling against metis
 
-The `config.*/example` directories contain additional example configuration
-files for the corresponding shell:
+The `config.{csh,sh}/example/` directories contain additional example
+configuration files for the corresponding shell:
 
 * `compiler` : an example of fine tuning ThirdParty compiler settings
 * `openmpi` : an example of fine tuning openmpi settings for OpenFOAM
 * `paraview` : an example of chaining to the standard config/paraview
    with a different ParaView_VERSION
-* `prefs`: an example of supplying alternative site-defined settings
+* `prefs.csh`, `prefs.sh`: examples of supplying alternative site-defined
+  settings
 
 
 ## OpenFOAM configuration layers
@@ -95,8 +96,11 @@ variants as well.
    some general OpenFOAM-specific settings, which you can use for
    guidance but in general you should note the following:
 
-   * Changes made to this `bashrc` file will be lost with the next upgrade.
-   * Should override via a `prefs.sh` file instead of editing this file.
+   * Changes made to this `etc/bashrc` file ___will be lost___ with
+     the next upgrade.
+   * Overrides should defined in the `etc/prefs.sh` instead.
+     See the comments section of the `etc/bashrc` file for more details.
+
 
 2. The `etc/bashrc` file (our entry point) passes control to the
    `etc/config.sh/setup` file, which dispatches the rest of the
diff --git a/doc/Requirements.md b/doc/Requirements.md
index a78bbd53cc..5dc1a80f19 100644
--- a/doc/Requirements.md
+++ b/doc/Requirements.md
@@ -4,7 +4,7 @@ OpenFOAM requires a functioning C++11 compiler and `make` build toolchain.
 
 ### Minimum recommended versions
 
-- gcc: 4.8.5
+- gcc : 4.8.5
 - cmake: 3.3 (required for ParaView and CGAL build)
 - boost: 1.48 (required for CGAL build and some functionality)
 - fftw: 3.3.7 (recommended - required for FFT-related functionality)
@@ -20,6 +20,7 @@ To check the installed versions
 |---------------|-----------------------|
 | gcc           | gcc --version         |
 | icc           | icc --version         |
+| openmpi       | orterun --version     |
 | cmake         | cmake --version       |
 | openmpi       | orterun --version     |
 
@@ -27,8 +28,9 @@ To check the installed versions
 
 ### Additional utilities
 
-- flex
-- QT: 5.9 (optional - for ParaView build)
+- flex : **not 2.6.2, 2.6.3** (fails for building scotch)
+- m4 : no known minimum level
+- QT : 5.9 (optional - for ParaView build)
 
 
 ### Ubuntu (eg, 19.04)
@@ -74,11 +76,13 @@ sudo apt-cache show fftw3-dev
 | openmpi   | 19.04     | 3.1.3           |
 | cmake     | 19.04     | 3.13.4          |
 | flex      | 19.04     | 2.6.4           |
+| m4        | 15.1      | 1.4.18          |
 
 
-### openSUSE (eg, Leap-15.0)
+### openSUSE (eg, Leap-15.1)
 
-Install the dependencies by copying and pasting the following lines to the command line:
+Install the dependencies by copying and pasting the following lines to
+the command line:
 
 ```
 sudo zypper install -t pattern devel_C_C++
@@ -89,10 +93,11 @@ This installs
 
 | Program   | openSUSE  | Program version |
 |-----------|-----------|-----------------|
-| gcc       | 15.0      | 7.4.3           |
-| openmpi   | 15.0      | 1.10.7          |
-| cmake     | 15.0      | 3.10.2          |
-| flex      | 15.0      | 2.6.4           |
+| gcc       | 15.1      | 7.4.3           |
+| openmpi   | 15.1      | 1.10.7          |
+| cmake     | 15.1      | 3.10.2          |
+| flex      | 15.1      | 2.6.4           |
+| m4        | 15.1      | 1.4.18          |
 
 
 #### OpenMPI