Emacs: projectile: Some variables can't be customized …

… but have to be setq-ed, apparently.

init.d/programming/common.el

@@ -104,15 +104,15 @@ Ignores ARGS."
             (projectile-kill-buffers)
             (delete-other-windows)
             (purpose-set-window-purpose-dedicated-p nil nil)))
-  :custom ((projectile-project-compilation-dir "build")
-           (projectile-switch-project-action 'my/switch-project)
-           (projectile-project-configure-cmd
-            "cmake -GUnix\\ Makefiles -DCMAKE_BUILD_TYPE=Debug \
--DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DWITH_TESTS=YES ..")
+  :custom ((projectile-switch-project-action 'my/switch-project)
            (projectile-completion-system 'ivy)
            (projectile-indexing-method 'hybrid) ; Allow filtering.
            (projectile-globally-ignored-file-suffixes '("~" "#")))
   :config (progn
+            (setq projectile-project-compilation-dir "build")
+            (setq projectile-project-configure-cmd
+                  "cmake -GUnix\\ Makefiles -DCMAKE_BUILD_TYPE=Debug \
+-DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DWITH_TESTS=YES ..")
             (setq projectile-project-compilation-cmd
                   (concat "cmake --build . -- -j"
                           (substring