diff --git a/AK/.gitignore b/AK/.gitignore
index e9b985837a..ff8bc6b4e4 100644
--- a/AK/.gitignore
+++ b/AK/.gitignore
@@ -1,2 +1,3 @@
 akit-test
 *.o
+*.d
diff --git a/Kernel/.gitignore b/Kernel/.gitignore
index 8431799f13..69c0ff7371 100644
--- a/Kernel/.gitignore
+++ b/Kernel/.gitignore
@@ -1,4 +1,5 @@
 *.o
+*.d
 .floppy-image
 Boot/boot.bin
 kernel
diff --git a/Kernel/Makefile b/Kernel/Makefile
index 3c572674b5..5fe43e0b44 100644
--- a/Kernel/Makefile
+++ b/Kernel/Makefile
@@ -86,7 +86,7 @@ INCLUDE_FLAGS = -I.. -I.
 
 DEFINES = -DSERENITY -DKERNEL -DSANITIZE_PTRS
 
-CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(KERNEL_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(SUGGEST_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(KERNEL_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(SUGGEST_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
 CXX = clang
 LD = ld
 LDFLAGS = -T linker.ld --strip-debug -melf_i386 --gc-sections --build-id=none -z norelro -z now
@@ -111,6 +111,8 @@ $(BOOTLOADER): Boot/boot.asm
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 
-clean:
-	@echo "CLEAN"; rm -f $(KERNEL) $(OBJS) $(BOOTLOADER) $(IMAGE)
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(KERNEL) $(OBJS) $(BOOTLOADER) $(IMAGE) *.d
 
diff --git a/LibC/.gitignore b/LibC/.gitignore
index 1f6ba4783d..196c9f02af 100644
--- a/LibC/.gitignore
+++ b/LibC/.gitignore
@@ -1,2 +1,3 @@
 *.o
+*.d
 LibC.a
diff --git a/LibC/Makefile b/LibC/Makefile
index 90dbd15ed5..7704012171 100644
--- a/LibC/Makefile
+++ b/LibC/Makefile
@@ -59,7 +59,7 @@ INCLUDE_FLAGS = -I.. -I.
 
 DEFINES = -DSERENITY -DUSERLAND -DSANITIZE_PTRS
 
-CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(LIBC_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(LIBC_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
 CXX = clang
 LD = ld
 AR = ar
@@ -73,6 +73,8 @@ $(LIBRARY): $(OBJS)
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 
-clean:
-	@echo "CLEAN"; rm -f $(LIBRARY) $(OBJS)
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(LIBRARY) $(OBJS) *.d
 
diff --git a/LibGUI/.gitignore b/LibGUI/.gitignore
index 0e4334e117..2786c2d53d 100644
--- a/LibGUI/.gitignore
+++ b/LibGUI/.gitignore
@@ -1,2 +1,3 @@
 *.o
+*.d
 LibGUI.a
diff --git a/LibGUI/Makefile b/LibGUI/Makefile
index f38bdc94be..22d6a0bd76 100644
--- a/LibGUI/Makefile
+++ b/LibGUI/Makefile
@@ -32,7 +32,7 @@ INCLUDE_FLAGS = -I../LibC -I.. -I.
 
 DEFINES = -DSERENITY -DUSERLAND -DSANITIZE_PTRS -DLIBGUI
 
-CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(LIBC_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(LIBC_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
 CXX = clang
 LD = ld
 AR = ar
@@ -46,6 +46,8 @@ $(LIBRARY): $(OBJS)
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 
-clean:
-	@echo "CLEAN"; rm -f $(LIBRARY) $(OBJS)
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(LIBRARY) $(OBJS) *.d
 
diff --git a/SharedGraphics/.gitignore b/SharedGraphics/.gitignore
index 5761abcfdf..6142305dc1 100644
--- a/SharedGraphics/.gitignore
+++ b/SharedGraphics/.gitignore
@@ -1 +1,2 @@
 *.o
+*.d
diff --git a/Terminal/.gitignore b/Terminal/.gitignore
index 1e2b6ab46c..1029333f8d 100644
--- a/Terminal/.gitignore
+++ b/Terminal/.gitignore
@@ -1,2 +1,3 @@
 *.o
+*.d
 Terminal
diff --git a/Terminal/Makefile b/Terminal/Makefile
index 40e66f47fe..8ccc36fc8e 100644
--- a/Terminal/Makefile
+++ b/Terminal/Makefile
@@ -14,7 +14,7 @@ INCLUDE_FLAGS = -I.. -I. -I../LibC
 
 DEFINES = -DSERENITY -DSANITIZE_PTRS -DUSERLAND
 
-CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(USERLAND_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(USERLAND_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
 CXX = clang
 LD = ld
 AR = ar
@@ -28,6 +28,8 @@ $(APP): $(OBJS)
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 
-clean:
-	@echo "CLEAN"; rm -f $(APPS) $(OBJS)
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(APPS) $(OBJS) *.d
 
diff --git a/Userland/.gitignore b/Userland/.gitignore
index 61deb7d2ef..d6ac23a048 100644
--- a/Userland/.gitignore
+++ b/Userland/.gitignore
@@ -1,4 +1,5 @@
 *.o
+*.d
 id
 sh
 ps
diff --git a/Userland/Makefile b/Userland/Makefile
index d4b28b9fec..863f658741 100644
--- a/Userland/Makefile
+++ b/Userland/Makefile
@@ -69,7 +69,7 @@ INCLUDE_FLAGS = -I.. -I. -I../LibC
 
 DEFINES = -DSERENITY -DSANITIZE_PTRS -DUSERLAND
 
-CXXFLAGS = $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(USERLAND_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
+CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(USERLAND_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
 CXX = clang
 LD = ld
 AR = ar
@@ -167,6 +167,8 @@ chmod: chmod.o
 .cpp.o:
 	@echo "CXX $<"; $(CXX) $(CXXFLAGS) -o $@ -c $<
 
-clean:
-	@echo "CLEAN"; rm -f $(APPS) $(OBJS)
+-include $(OBJS:%.o=%.d)
+
+clean:
+	@echo "CLEAN"; rm -f $(APPS) $(OBJS) *.d
 
diff --git a/WindowServer/.gitignore b/WindowServer/.gitignore
index 5761abcfdf..6142305dc1 100644
--- a/WindowServer/.gitignore
+++ b/WindowServer/.gitignore
@@ -1 +1,2 @@
 *.o
+*.d