diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..0be3dd2
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,32 @@
+# clang-format is fairly limited, and these rules are approximate:
+#  - array initializers can get terribly mangled with clang-format 12.0,
+#  - sometimes it still aligns with space characters,
+#  - struct name NL { NL ... NL } NL name; is unachievable.
+BasedOnStyle: GNU
+ColumnLimit: 80
+IndentWidth: 4
+TabWidth: 4
+UseTab: ForContinuationAndIndentation
+BreakBeforeBraces: Allman
+SpaceAfterCStyleCast: true
+AlignAfterOpenBracket: DontAlign
+AlignEscapedNewlines: DontAlign
+AlignOperands: DontAlign
+AlignConsecutiveMacros: Consecutive
+AllowAllArgumentsOnNextLine: false
+AllowAllParametersOfDeclarationOnNextLine: false
+IndentGotoLabels: false
+MaxEmptyLinesToKeep: 2
+
+# IncludeCategories has some potential, but it may also break the build.
+# Note that the documentation says the value should be "Never".
+SortIncludes: false
+
+# Must be kept synchronized with gi18n.h and make-template.sh.
+WhitespaceSensitiveMacros: ['_', 'Q_', 'N_', 'C_', 'NC_']
+
+# This is a compromise, it generally works out aesthetically better.
+BinPackArguments: false
+
+# Unfortunately, this can't be told to align to column 40 or so.
+SpacesBeforeTrailingComments: 2
diff --git a/src/sdgui.c b/src/sdgui.c
index 9589fa9..d0e9fc9 100644
--- a/src/sdgui.c
+++ b/src/sdgui.c
@@ -305,7 +305,6 @@ on_open (G_GNUC_UNUSED GtkMenuItem *item, G_GNUC_UNUSED gpointer data)
 			Dictionary *dict = g_malloc0 (sizeof *dict);
 			dict->filename = iter->data;
 			g_ptr_array_add (new_dictionaries, dict);
-
 		}
 		g_slist_free (paths);
 	}
diff --git a/src/sdtui.c b/src/sdtui.c
index f7cdb02..eae9b69 100644
--- a/src/sdtui.c
+++ b/src/sdtui.c
@@ -67,7 +67,7 @@ unichar_width (gunichar ch)
 void
 update_curses_terminal_size (void)
 {
-#if defined (HAVE_RESIZETERM) && defined (TIOCGWINSZ)
+#if defined HAVE_RESIZETERM && defined TIOCGWINSZ
 	struct winsize size;
 	if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size))
 	{