[Github] Do not install forge pacakge on Windows by default

CHANGELOG.develop

@@ -1490,6 +1490,8 @@ Other:
 **** GitHub
 - Packages:
   - Added new packages =forge= (thanks to Miciah Dashiel Butler Masters)
+  - Do not install =forge= on Windows by default, see =README.org= of the layer
+    (thanks to Sylvain Benner)
   - Remove package =github-browse-file= which has been replaced by
    =browse-at-remote= in =version-control= layer
 - Key bindings:

layers/+source-control/github/README.org

@@ -10,8 +10,9 @@
 - [[#install][Install]]
   - [[#layer][Layer]]
   - [[#git-configuration][Git configuration]]
+  - [[#forge][Forge]]
 - [[#key-bindings][Key bindings]]
-  - [[#forge][forge]]
+  - [[#forge-1][Forge]]
   - [[#gistel][gist.el]]
   - [[#clone-repositories][Clone repositories]]
 
@@ -41,8 +42,21 @@ You will also need to [[https://help.github.com/articles/generating-a-new-ssh-ke
   git config --global github.oauth-token <token>
 #+END_SRC
 
+** Forge
+The =forge= package uses =emacsql= which requires a C compiler to be available
+on MS Windows, see issue https://github.com/skeeto/emacsql/issues/46.
+
+For this reason the =forge= package is not installed on MS Windows by default.
+If you still want to install it (which means you do have a C compiler available
+in your PATH) then use the =dotspacemacs-additional-packages= variable in your
+dotfile:
+
+#+BEGIN_SRC emacs-lisp
+  (dotspacemacs-additional-packages '((forge :toggle t)))
+#+END_SRC
+
 * Key bindings
-** forge
+** Forge
 In a =magit-status= buffer (~SPC g s~):
 
 | Key binding | Description                                               |

layers/+source-control/github/packages.el

@@ -11,7 +11,9 @@
 
 (setq github-packages
       '(
-        forge
+        ;; forge requires a C compiler on Windows so we disable
+        ;; it by default on Windows.
+        (forge :toggle (not (spacemacs/system-is-mswindows)))
         gist
         github-clone
         github-search