diff --git a/.dir-locals.el b/.dir-locals.el
new file mode 100644
index 0000000..e0716f9
--- /dev/null
+++ b/.dir-locals.el
@@ -0,0 +1,99 @@
+;; Per-directory local variables for GNU Emacs 23 and later.
+
+((nil
+  . ((fill-column . 78)
+     (tab-width   .  8)
+     (sentence-end-double-space . t)
+
+     ;; For use with 'bug-reference-prog-mode'.
+     (bug-reference-url-format . "https://gitlab.com/nonguix/nonguix/issues/%s")
+     (bug-reference-bug-regexp
+      . "#[0-9]+")))
+ (c-mode          . ((c-file-style . "gnu")))
+ (scheme-mode
+  .
+  ((indent-tabs-mode . nil)
+   (eval . (put 'eval-when 'scheme-indent-function 1))
+   (eval . (put 'call-with-prompt 'scheme-indent-function 1))
+   (eval . (put 'test-assert 'scheme-indent-function 1))
+   (eval . (put 'test-assertm 'scheme-indent-function 1))
+   (eval . (put 'test-equalm 'scheme-indent-function 1))
+   (eval . (put 'test-equal 'scheme-indent-function 1))
+   (eval . (put 'test-eq 'scheme-indent-function 1))
+   (eval . (put 'call-with-input-string 'scheme-indent-function 1))
+   (eval . (put 'guard 'scheme-indent-function 1))
+   (eval . (put 'lambda* 'scheme-indent-function 1))
+   (eval . (put 'substitute* 'scheme-indent-function 1))
+   (eval . (put 'match-record 'scheme-indent-function 2))
+
+   ;; 'modify-phases' and its keywords.
+   (eval . (put 'modify-phases 'scheme-indent-function 1))
+   (eval . (put 'replace 'scheme-indent-function 1))
+   (eval . (put 'add-before 'scheme-indent-function 2))
+   (eval . (put 'add-after 'scheme-indent-function 2))
+
+   (eval . (put 'modify-services 'scheme-indent-function 1))
+   (eval . (put 'with-directory-excursion 'scheme-indent-function 1))
+   (eval . (put 'package 'scheme-indent-function 0))
+   (eval . (put 'origin 'scheme-indent-function 0))
+   (eval . (put 'build-system 'scheme-indent-function 0))
+   (eval . (put 'bag 'scheme-indent-function 0))
+   (eval . (put 'graft 'scheme-indent-function 0))
+   (eval . (put 'operating-system 'scheme-indent-function 0))
+   (eval . (put 'file-system 'scheme-indent-function 0))
+   (eval . (put 'manifest-entry 'scheme-indent-function 0))
+   (eval . (put 'manifest-pattern 'scheme-indent-function 0))
+   (eval . (put 'substitute-keyword-arguments 'scheme-indent-function 1))
+   (eval . (put 'with-store 'scheme-indent-function 1))
+   (eval . (put 'with-external-store 'scheme-indent-function 1))
+   (eval . (put 'with-error-handling 'scheme-indent-function 0))
+   (eval . (put 'with-mutex 'scheme-indent-function 1))
+   (eval . (put 'with-atomic-file-output 'scheme-indent-function 1))
+   (eval . (put 'call-with-compressed-output-port 'scheme-indent-function 2))
+   (eval . (put 'call-with-decompressed-port 'scheme-indent-function 2))
+   (eval . (put 'call-with-gzip-input-port 'scheme-indent-function 1))
+   (eval . (put 'call-with-gzip-output-port 'scheme-indent-function 1))
+   (eval . (put 'call-with-lzip-input-port 'scheme-indent-function 1))
+   (eval . (put 'call-with-lzip-output-port 'scheme-indent-function 1))
+   (eval . (put 'signature-case 'scheme-indent-function 1))
+   (eval . (put 'emacs-batch-eval 'scheme-indent-function 0))
+   (eval . (put 'emacs-batch-edit-file 'scheme-indent-function 1))
+   (eval . (put 'emacs-substitute-sexps 'scheme-indent-function 1))
+   (eval . (put 'emacs-substitute-variables 'scheme-indent-function 1))
+   (eval . (put 'with-derivation-narinfo 'scheme-indent-function 1))
+   (eval . (put 'with-derivation-substitute 'scheme-indent-function 2))
+   (eval . (put 'with-status-report 'scheme-indent-function 1))
+   (eval . (put 'with-status-verbosity 'scheme-indent-function 1))
+
+   (eval . (put 'mlambda 'scheme-indent-function 1))
+   (eval . (put 'mlambdaq 'scheme-indent-function 1))
+   (eval . (put 'syntax-parameterize 'scheme-indent-function 1))
+   (eval . (put 'with-monad 'scheme-indent-function 1))
+   (eval . (put 'mbegin 'scheme-indent-function 1))
+   (eval . (put 'mwhen 'scheme-indent-function 1))
+   (eval . (put 'munless 'scheme-indent-function 1))
+   (eval . (put 'mlet* 'scheme-indent-function 2))
+   (eval . (put 'mlet 'scheme-indent-function 2))
+   (eval . (put 'run-with-store 'scheme-indent-function 1))
+   (eval . (put 'run-with-state 'scheme-indent-function 1))
+   (eval . (put 'wrap-program 'scheme-indent-function 1))
+   (eval . (put 'with-imported-modules 'scheme-indent-function 1))
+   (eval . (put 'with-extensions 'scheme-indent-function 1))
+
+   (eval . (put 'with-database 'scheme-indent-function 2))
+   (eval . (put 'call-with-transaction 'scheme-indent-function 2))
+
+   (eval . (put 'call-with-container 'scheme-indent-function 1))
+   (eval . (put 'container-excursion 'scheme-indent-function 1))
+   (eval . (put 'eventually 'scheme-indent-function 1))
+
+   (eval . (put 'call-with-progress-reporter 'scheme-indent-function 1))
+
+   ;; This notably allows '(' in Paredit to not insert a space when the
+   ;; preceding symbol is one of these.
+   (eval . (modify-syntax-entry ?~ "'"))
+   (eval . (modify-syntax-entry ?$ "'"))
+   (eval . (modify-syntax-entry ?+ "'"))))
+ (emacs-lisp-mode . ((indent-tabs-mode . nil)))
+ (texinfo-mode    . ((indent-tabs-mode . nil)
+                     (fill-column . 72))))