diff --git a/Makefile b/Makefile
index b7e7e5f..61b67de 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 # Copyright (c) 2023–2024 Emma Tebibyte <emma@tebibyte.media>
-# Copyright (c) 2023 DTB <trinity@trinity.moe>
+# Copyright (c) 2023–2024 DTB <trinity@trinity.moe>
 # Copyright (c) 2023 Sasha Koshka <sashakoshka@tebibyte.media>
 # SPDX-License-Identifier: FSFAP
 #
@@ -10,19 +10,15 @@
 .POSIX:
 .PRAGMA: posix_202x # future POSIX standard support à la pdpmake(1)
 
-.PHONY: all
-.PHONY: clean
-.PHONY: install
-.PHONY: test
-
 PREFIX=/usr/local
 
 CC=cc
 RUSTC=rustc
 
 # to build, first run ./configure
-include *.mk
+include cc.mk rustc.mk
 
+.PHONY: all
 all: dj false fop intcmp scrut str strcmp true
 
 build:
@@ -30,6 +26,7 @@ build:
 	# https://github.com/rust-lang/rust-bindgen/issues/2703
 	mkdir -p build/bin build/include build/lib build/o build/test
 
+.PHONY: clean
 clean:
 	rm -rf build/ dist/
 
@@ -38,10 +35,12 @@ dist: all
 	cp build/bin/* dist/bin/
 	cp docs/*.1 dist/share/man/man1/
 
+.PHONY: install
 install: dist
 	mkdir -p $(PREFIX)
 	cp -r dist/* $(PREFIX)/
 
+.PHONY: test
 test: build
 	tests/cc-compat.sh
 	tests/posix-compat.sh
@@ -61,27 +60,43 @@ libgetopt: src/getopt-rs/lib.rs
 	$(RUSTC) $(RUSTCFLAGS) --crate-type=lib --crate-name=getopt \
 		-o build/o/libgetopt.rlib src/getopt-rs/lib.rs
 
-dj: src/dj.c build
-	$(CC) $(CFLAGS) -o build/bin/dj src/dj.c
+.PHONY: dj
+dj: build/bin/dj
+build/bin/dj: src/dj.c build
+	$(CC) $(CFLAGS) -o $@ src/dj.c
 
-false: src/false.c build
-	$(CC) $(CFLAGS) -o build/bin/false src/false.c
+.PHONY: false
+false: build/bin/false
+build/bin/false: src/false.c build
+	$(CC) $(CFLAGS) -o $@ src/false.c
 
-fop: src/fop.rs build libgetopt sysexits
+.PHONY: fop
+fop: build/bin/fop
+build/bin/fop: src/fop.rs build libgetopt sysexits
 	$(RUSTC) $(RUSTFLAGS) --extern getopt=build/o/libgetopt.rlib \
-		-o build/bin/fop src/fop.rs
+		-o $@ src/fop.rs
 
-intcmp: src/intcmp.c build
-	$(CC) $(CFLAGS) -o build/bin/intcmp src/intcmp.c
+.PHONY: intcmp
+intcmp: build/bin/intcmp
+build/bin/intcmp: src/intcmp.c build
+	$(CC) $(CFLAGS) -o $@ src/intcmp.c
 
-scrut: src/scrut.c build
-	$(CC) $(CFLAGS) -o build/bin/scrut src/scrut.c
+.PHONY: scrut
+scrut: build/bin/scrut
+build/bin/scrut: src/scrut.c build
+	$(CC) $(CFLAGS) -o $@ src/scrut.c
 
-str: src/str.c build
-	$(CC) $(CFLAGS) -o build/bin/str src/str.c
+.PHONY: str
+str: build/bin/str
+build/bin/str: src/str.c build
+	$(CC) $(CFLAGS) -o $@ src/str.c
 
-strcmp: src/strcmp.c build
-	$(CC) $(CFLAGS) -o build/bin/strcmp src/strcmp.c
+.PHONY: strcmp
+strcmp: build/bin/strcmp
+build/bin/strcmp: src/strcmp.c build
+	$(CC) $(CFLAGS) -o $@ src/strcmp.c
 
-true: src/true.c build
-	$(CC) $(CFLAGS) -o build/bin/true src/true.c
+.PHONY: true
+true: build/bin/true
+build/bin/true: src/true.c build
+	$(CC) $(CFLAGS) -o $@ src/true.c
diff --git a/configure b/configure
index eb1c8ae..c710afb 100755
--- a/configure
+++ b/configure
@@ -14,26 +14,30 @@ RUSTFLAGS='-Copt-level=z -Ccodegen-units=1 -Cpanic=abort -Clto=y \
 	-Cstrip=symbols -Ctarget-cpu=native \
 	--extern sysexits=build/o/libsysexits.rlib'
 
-case "$@" in
-	clang)
-		CFLAGS="$CFLAGS -Wall"
-		;;
-	clean)
-		rm *.mk || true
-		exit 0
-		;;
-	gcc)
-		CFLAGS="$CFLAGS -s -Wl,-z,noseparate-code,-z,nosectionheader -flto"
-		;;
-	'rustc +nightly')
-		RUSTFLAGS="+nightly -Zlocation-detail=none $RUSTFLAGS"
-		;;
-	'') ;;
-	*)
-		printf 'Usage: %s [compiler]\n' "$0"
-		exit 64 # sysexits.h(3) EX_USAGE
-		;;
-esac
+if [ "$1" = "clean" ]; then
+	rm *.mk || true
+	exit 0
+fi
+
+while test -n "$1"; do
+	case "$1" in
+		clang)
+			CFLAGS="$CFLAGS -Wall"
+			;;
+		gcc)
+			CFLAGS="$CFLAGS -s -Wl,-z,noseparate-code,-z,nosectionheader -flto"
+			;;
+		'rustc +nightly')
+			RUSTFLAGS="+nightly -Zlocation-detail=none $RUSTFLAGS"
+			;;
+		*)
+			printf 'Usage: %s [clean | compiler]\n' "$0"
+			exit 64 # sysexits.h(3) EX_USAGE
+			;;
+	esac
+
+	shift
+done
 
 printf 'CFLAGS=%s\n' "$CFLAGS" >cc.mk
 printf 'RUSTFLAGS=%s\n' "$RUSTFLAGS" >rustc.mk