diff --git a/fetchfont.nix b/fetchfont.nix
index 3aa32d1..5401e0c 100644
--- a/fetchfont.nix
+++ b/fetchfont.nix
@@ -1,91 +1,96 @@
 # vim: set noet sw=2 ts=2 sts=2:
 {lib, pkgs, ...}:
 ({src ? null , srcs ? null, name ? "", pname ? "", version ? ""}:
-with pkgs;
-let
-	name_ =
-		if "" != name
-		then name
-		else "${pname}-v${version}";
-in stdenv.mkDerivation ({
-	name = name_;
-	nativeBuildInputs = [ sfnt2woff-zopfli unzip coreutils fontconfig woff2 ];
-	unpackPhase = ''
-		source_dir="$TMPDIR/src"
-		mkdir "$source_dir"
-		cd "$source_dir"
-		for s in $src $srcs
-		do
-			case "$s" in
-			*.zip|*.tar|*.tar.gz|*.tgz|*.tar.xz|*.txz|*.tar.bz2|*.tbz2)
-				unpackFile "$s"
-				;;
-			*)
-				cp -pr --reflink=auto -- "$s" "$(stripHash "$s")"
-				;;
-			esac
-		done
-	'';
-	buildPhase = ''
-		set -e
-		build_dir="$TMPDIR/build"
-		mkdir "$build_dir"
-		find "$source_dir" \( -name \*.otf -or -name \*.ttf -or -name \*.woff -or -name \*.woff2 \) -exec cp \{\} "$build_dir" \;
-		cd "$build_dir"
+	with pkgs;
+	let
+		name_ =
+			if "" != name
+			then name
+			else "${pname}-v${version}";
+	in stdenv.mkDerivation ({
+		name = name_;
+		nativeBuildInputs = [ sfnt2woff-zopfli unzip coreutils fontconfig woff2 ];
+		unpackPhase = ''
+			source_dir="$TMPDIR/src"
+			mkdir "$source_dir"
+			cd "$source_dir"
+			for s in $src $srcs
+			do
+				case "$s" in
+				*.zip|*.tar|*.tar.gz|*.tgz|*.tar.xz|*.txz|*.tar.bz2|*.tbz2)
+					unpackFile "$s"
+					;;
+				*)
+					cp -pr --reflink=auto -- "$s" "$(stripHash "$s")"
+					;;
+				esac
+			done
+		'';
+		buildPhase = ''
+			set -e
+			build_dir="$TMPDIR/build"
+			mkdir "$build_dir"
+			find "$source_dir" \( -name \*.otf -or -name \*.ttf -or -name \*.woff -or -name \*.woff2 \) -exec cp \{\} "$build_dir" \;
+			cd "$build_dir"
 
-		for s in *.otf *.ttf
-		do
-			bn="''${s%.otf}"
-			bn="''${bn%.ttf}"
-			if ! [ -e "$bn.woff" ]
-			then
-				echo "sfnt2woff-zopfli $s => $bn.woff"
-				sfnt2woff-zopfli "$s"
-			fi
-			if ! [ -e "$bn.woff2" ]
-			then
-				echo "woff2_compress $s => $bn.woff2"
-				woff2_compress "$s"
-			fi
-		done
+			for s in *.otf *.ttf
+			do
+				bn="''${s%.otf}"
+				bn="''${bn%.ttf}"
+				if ! [ -e "$bn.woff" ]
+				then
+					echo "sfnt2woff-zopfli $s => $bn.woff"
+					sfnt2woff-zopfli "$s"
+				fi
+				if ! [ -e "$bn.woff2" ]
+				then
+					echo "woff2_compress $s => $bn.woff2"
+					woff2_compress "$s"
+				fi
+			done
 
-		for s in *.otf *.ttf *.woff
-		do
-			fc="`dirname "$s"`/`basename "$s"`.fc"
-			echo "fc-scan $s"
-			LANG=C LC_NUMERIC=C fc-scan --format 'family=%{family}
-		fullname=%{fullname}
-		postscriptname=%{postscriptname}
-		variable=%{variable}
-		slant=%{slant}
-		style=%{style}
-		weight=%{weight}
-		width=%{width}
+			for s in *.otf *.ttf *.woff
+			do
+				fc="`dirname "$s"`/`basename "$s"`.fc"
+				echo "fc-scan $s"
+				LANG=C LC_NUMERIC=C fc-scan --format 'family=%{family}
+fullname=%{fullname}
+postscriptname=%{postscriptname}
+variable=%{variable}
+slant=%{slant}
+style=%{style}
+weight=%{weight}
+width=%{width}
 
-		' "$s" > "$fc"
-		done
-		for s in *.woff2
-		do
-			o="`dirname "$s"`/`basename "$s" .woff2`.woff.fc"
-			fc="`dirname "$s"`/`basename "$s"`.fc"
-			cp "$o" "$fc"
-		done
-	'';
-	installPhase = ''
-		cd "$TMPDIR"
-		mkdir -p $out/share/{doc/${name_},fonts/{opentype,truetype,WOFF,WOFF2}{,/.fc}}
-		find "$build_dir"  -name \*.otf   -exec cp \{\} $out/share/fonts/opentype \;
-		find "$build_dir"  -name \*.ttf   -exec cp \{\} $out/share/fonts/truetype \;
-		find "$build_dir"  -name \*.woff  -exec cp \{\} $out/share/fonts/WOFF \;
-		find "$build_dir"  -name \*.woff2 -exec cp \{\} $out/share/fonts/WOFF2 \;
-		find "$build_dir"  -name \*.otf.fc   -exec cp \{\} $out/share/fonts/opentype/.fc \;
-		find "$build_dir"  -name \*.ttf.fc   -exec cp \{\} $out/share/fonts/truetype/.fc \;
-		find "$build_dir"  -name \*.woff.fc  -exec cp \{\} $out/share/fonts/WOFF/.fc \;
-		find "$build_dir"  -name \*.woff2.fc -exec cp \{\} $out/share/fonts/WOFF2/.fc \;
-		find "$source_dir" -name \*.txt   -exec cp \{\} $out/share/doc/${name_} \;
-		find "$source_dir" -name \*.md    -exec cp \{\} $out/share/doc/${name_} \;
-		find "$source_dir" -name \*.adoc  -exec cp \{\} $out/share/doc/${name_} \;
-		find "$source_dir" -name \*.html  -exec cp \{\} $out/share/doc/${name_} \;
-		find "$source_dir" -name \*.css   -exec cp \{\} $out/share/doc/${name_} \;
-	'';
-} // (if null != src then { src = src; } else { srcs = srcs; })))
+' "$s" > "$fc"
+			done
+			for s in *.woff2
+			do
+				o="`dirname "$s"`/`basename "$s" .woff2`.woff.fc"
+				fc="`dirname "$s"`/`basename "$s"`.fc"
+				cp "$o" "$fc"
+			done
+			'';
+		installPhase = ''
+			cd "$TMPDIR"
+			mkdir -p $out/share/{doc/${name_},fonts/{opentype,truetype,WOFF,WOFF2}{,/.fc}}
+			find "$build_dir"  -name \*.otf   -exec cp \{\} $out/share/fonts/opentype \;
+			find "$build_dir"  -name \*.ttf   -exec cp \{\} $out/share/fonts/truetype \;
+			find "$build_dir"  -name \*.woff  -exec cp \{\} $out/share/fonts/WOFF \;
+			find "$build_dir"  -name \*.woff2 -exec cp \{\} $out/share/fonts/WOFF2 \;
+			find "$build_dir"  -name \*.otf.fc   -exec cp \{\} $out/share/fonts/opentype/.fc \;
+			find "$build_dir"  -name \*.ttf.fc   -exec cp \{\} $out/share/fonts/truetype/.fc \;
+			find "$build_dir"  -name \*.woff.fc  -exec cp \{\} $out/share/fonts/WOFF/.fc \;
+			find "$build_dir"  -name \*.woff2.fc -exec cp \{\} $out/share/fonts/WOFF2/.fc \;
+			find "$source_dir" -name \*.txt   -exec cp \{\} $out/share/doc/${name_} \;
+			find "$source_dir" -name \*.md    -exec cp \{\} $out/share/doc/${name_} \;
+			find "$source_dir" -name \*.adoc  -exec cp \{\} $out/share/doc/${name_} \;
+			find "$source_dir" -name \*.html  -exec cp \{\} $out/share/doc/${name_} \;
+			find "$source_dir" -name \*.css   -exec cp \{\} $out/share/doc/${name_} \;
+		'';
+	} // (
+		if null != src
+		then { src = src; }
+		else { srcs = srcs; }
+	))
+)