diff --git a/Applications/About/Makefile b/Applications/About/Makefile
index a3170934defe21..323301360ea203 100644
--- a/Applications/About/Makefile
+++ b/Applications/About/Makefile
@@ -1,20 +1,11 @@
+include ../../Makefile.common
+
 OBJS = \
     main.o
 
 APP = About
 
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/Downloader/Makefile b/Applications/Downloader/Makefile
index 0a16ef941900c5..cfd0bb3011a14e 100644
--- a/Applications/Downloader/Makefile
+++ b/Applications/Downloader/Makefile
@@ -1,21 +1,11 @@
+include ../../Makefile.common
+
 OBJS = \
     main.o
 
 APP = Downloader
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../../Servers -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-AR = i686-pc-serenity-ar
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/FileManager/Makefile b/Applications/FileManager/Makefile
index 51209560e4b89c..059c1a282ea181 100644
--- a/Applications/FileManager/Makefile
+++ b/Applications/FileManager/Makefile
@@ -1,3 +1,5 @@
+include ../../Makefile.common
+
 OBJS = \
     DirectoryModel.o \
     DirectoryView.o \
@@ -5,18 +7,7 @@ OBJS = \
 
 APP = FileManager
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I../../Servers -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/FontEditor/Makefile b/Applications/FontEditor/Makefile
index c4190895eed9db..b044d72878d9f1 100644
--- a/Applications/FontEditor/Makefile
+++ b/Applications/FontEditor/Makefile
@@ -1,3 +1,5 @@
+include ../../Makefile.common
+
 OBJS = \
     FontEditor.o \
     GlyphMapWidget.o \
@@ -6,19 +8,7 @@ OBJS = \
 
 APP = FontEditor
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-AR = i686-pc-serenity-ar
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/IRCClient/Makefile b/Applications/IRCClient/Makefile
index c61164768cfb47..971f1dcde2f286 100644
--- a/Applications/IRCClient/Makefile
+++ b/Applications/IRCClient/Makefile
@@ -1,3 +1,5 @@
+include ../../Makefile.common
+
 OBJS = \
     IRCClient.o \
     IRCChannel.o \
@@ -12,19 +14,7 @@ OBJS = \
 
 APP = IRCClient
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../../Servers -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-AR = i686-pc-serenity-ar
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/Launcher/Makefile b/Applications/Launcher/Makefile
index 7062a8f26622f7..8a39790710e72f 100644
--- a/Applications/Launcher/Makefile
+++ b/Applications/Launcher/Makefile
@@ -1,20 +1,11 @@
+include ../../Makefile.common
+
 OBJS = \
     main.o
 
 APP = Launcher
 
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/ProcessManager/Makefile b/Applications/ProcessManager/Makefile
index 6b6f007f5f1e17..25c71068f23522 100644
--- a/Applications/ProcessManager/Makefile
+++ b/Applications/ProcessManager/Makefile
@@ -1,3 +1,5 @@
+include ../../Makefile.common
+
 OBJS = \
     ProcessModel.o \
     ProcessTableView.o \
@@ -6,18 +8,7 @@ OBJS = \
 
 APP = ProcessManager
 
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/Taskbar/Makefile b/Applications/Taskbar/Makefile
index 0c412c30397483..4f1ca2d20c95b4 100644
--- a/Applications/Taskbar/Makefile
+++ b/Applications/Taskbar/Makefile
@@ -1,3 +1,5 @@
+include ../../Makefile.common
+
 OBJS = \
     TaskbarWindow.o \
     WindowList.o \
@@ -5,18 +7,7 @@ OBJS = \
 
 APP = Taskbar
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I../../Servers -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/Terminal/Makefile b/Applications/Terminal/Makefile
index fddf7f11bbb384..04e40c01e235e8 100644
--- a/Applications/Terminal/Makefile
+++ b/Applications/Terminal/Makefile
@@ -1,21 +1,12 @@
+include ../../Makefile.common
+
 OBJS = \
     Terminal.o \
     main.o
 
 APP = Terminal
 
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/TextEditor/Makefile b/Applications/TextEditor/Makefile
index 9d608c49baf7b1..4c8dc105c7d9fc 100644
--- a/Applications/TextEditor/Makefile
+++ b/Applications/TextEditor/Makefile
@@ -1,20 +1,11 @@
+include ../../Makefile.common
+
 OBJS = \
     main.o
 
 APP = TextEditor
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Applications/VisualBuilder/Makefile b/Applications/VisualBuilder/Makefile
index 5188ef20838cea..27f8dcdc5d1d6d 100644
--- a/Applications/VisualBuilder/Makefile
+++ b/Applications/VisualBuilder/Makefile
@@ -1,3 +1,5 @@
+include ../../Makefile.common
+
 OBJS = \
     VBForm.o \
     VBWidget.o \
@@ -9,18 +11,7 @@ OBJS = \
 
 APP = VisualBuilder 
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../.. -I. -I../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-LDFLAGS = -L../../LibC -L../../LibCore -L../../LibGUI
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Kernel/Makefile b/Kernel/Makefile
index dd753ff3a01125..e38eaa9c0d8648 100644
--- a/Kernel/Makefile
+++ b/Kernel/Makefile
@@ -1,3 +1,5 @@
+include ../Makefile.common
+
 KERNEL_OBJS = \
        init.o \
        kmalloc.o \
@@ -77,24 +79,10 @@ CXX_OBJS = $(KERNEL_OBJS) $(VFS_OBJS) $(AK_OBJS)
 OBJS = $(CXX_OBJS) Boot/boot.ao
 
 KERNEL = kernel
-ARCH_FLAGS =
-STANDARD_FLAGS = -std=c++17 -nostdinc++ -nostdlib -nostdinc
-KERNEL_FLAGS = -ffreestanding
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -mregparm=3 -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I.. -I.
-CLANG_FLAGS = -Wconsumed -m32 -ffreestanding -march=i686
-#SUGGEST_FLAGS = -Wsuggest-final-types -Wsuggest-final-methods -Wsuggest-override #-Wsuggest-attribute=noreturn 
-
-DEFINES = -DKERNEL -DSANITIZE_PTRS
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(KERNEL_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(SUGGEST_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-#CXX = clang $(CLANG_FLAGS)
-CXX = i686-pc-serenity-g++
+CXXFLAGS += -ffreestanding -mregparm=3
+DEFINES += -DKERNEL
 LD = i686-pc-serenity-ld
-AS = i686-pc-serenity-as
-LDFLAGS = -T linker.ld
+LDFLAGS += -T linker.ld
 
 all: $(KERNEL) kernel.map
 
diff --git a/LibC/Makefile b/LibC/Makefile
index ad9c36dd104929..fbb3de53463ea5 100644
--- a/LibC/Makefile
+++ b/LibC/Makefile
@@ -1,3 +1,5 @@
+include ../Makefile.common
+
 AK_OBJS = \
     ../AK/StringImpl.o \
     ../AK/String.o \
@@ -48,19 +50,7 @@ ASM_OBJS = setjmp.no crti.ao crtn.ao
 CPP_OBJS = $(AK_OBJS) $(WIDGETS_OBJS) $(LIBC_OBJS)
 
 LIBRARY = libc.a
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti -fno-sized-deallocation
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I.. -I.
-
-DEFINES = -DUSERLAND -DSANITIZE_PTRS
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-ld
-AR = i686-pc-serenity-ar
-AS = i686-pc-serenity-as
+DEFINES += -DUSERLAND
 
 all: $(LIBRARY) startfiles
 
diff --git a/LibCore/Makefile b/LibCore/Makefile
index 1d73ded45bbbe1..710a77ae65c911 100644
--- a/LibCore/Makefile
+++ b/LibCore/Makefile
@@ -1,3 +1,5 @@
+include ../Makefile.common
+
 OBJS = \
     CIODevice.o \
     CFile.o \
@@ -17,18 +19,7 @@ OBJS = \
     CEvent.o
 
 LIBRARY = libcore.a
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../LibC -I../Servers -I.. -I.
-
-DEFINES = -DUSERLAND -DSANITIZE_PTRS -DLIBGUI
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-ld
-AR = i686-pc-serenity-ar
+DEFINES += -DUSERLAND
 
 all: $(LIBRARY)
 
diff --git a/LibGUI/Makefile b/LibGUI/Makefile
index dea0f3751b1cf3..924a5d3f601ec2 100644
--- a/LibGUI/Makefile
+++ b/LibGUI/Makefile
@@ -1,3 +1,5 @@
+include ../Makefile.common
+
 SHAREDGRAPHICS_OBJS = \
     ../SharedGraphics/Painter.o \
     ../SharedGraphics/StylePainter.o \
@@ -55,18 +57,7 @@ LIBGUI_OBJS = \
 OBJS = $(SHAREDGRAPHICS_OBJS) $(LIBGUI_OBJS)
 
 LIBRARY = libgui.a
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I../LibC -I../Servers -I.. -I.
-
-DEFINES = -DUSERLAND -DSANITIZE_PTRS -DLIBGUI
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-ld
-AR = i686-pc-serenity-ar
+DEFINES += -DUSERLAND
 
 all: $(LIBRARY)
 
diff --git a/LibM/Makefile b/LibM/Makefile
index 4257c41cbfd2d5..a6ab715693ce2a 100644
--- a/LibM/Makefile
+++ b/LibM/Makefile
@@ -1,18 +1,9 @@
+include ../Makefile.common
+
 OBJS = math.o
 
 LIBRARY = libm.a
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I.. -I.
-
-DEFINES = -DUSERLAND -DSANITIZE_PTRS
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-ld
-AR = i686-pc-serenity-ar
+DEFINES += -DUSERLAND
 
 all: $(LIBRARY)
 
diff --git a/Servers/LookupServer/Makefile b/Servers/LookupServer/Makefile
index 2986a501cdec32..2833309fbc48ad 100644
--- a/Servers/LookupServer/Makefile
+++ b/Servers/LookupServer/Makefile
@@ -1,22 +1,12 @@
+include ../../Makefile.common
+
 LOOKUPSERVER_OBJS = \
     main.o
 
 APP = LookupServer
 OBJS = $(LOOKUPSERVER_OBJS)
 
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I.. -I../.. -I. -I../../LibC
-LDFLAGS = -L../../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-AR = i686-pc-serenity-ar
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Servers/WindowServer/Makefile b/Servers/WindowServer/Makefile
index 6d08d3546afc00..542ff484087ad8 100644
--- a/Servers/WindowServer/Makefile
+++ b/Servers/WindowServer/Makefile
@@ -1,3 +1,5 @@
+include ../../Makefile.common
+
 SHAREDGRAPHICS_OBJS = \
     ../../SharedGraphics/Painter.o \
     ../../SharedGraphics/StylePainter.o \
@@ -29,19 +31,7 @@ WINDOWSERVER_OBJS = \
 APP = WindowServer
 OBJS = $(SHAREDGRAPHICS_OBJS) $(WINDOWSERVER_OBJS)
 
-STANDARD_FLAGS = -std=c++17 -Wno-sized-deallocation
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I.. -I../.. -I. -I../../LibC
-LDFLAGS = -L../../LibC -L../../LibCore
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-AR = i686-pc-serenity-ar
+DEFINES += -DUSERLAND
 
 all: $(APP)
 
diff --git a/Userland/Makefile b/Userland/Makefile
index 22c57efa088357..80c84a6af883bb 100644
--- a/Userland/Makefile
+++ b/Userland/Makefile
@@ -1,21 +1,10 @@
+include ../Makefile.common
+
 SRCS = $(wildcard *.cpp)
 OBJS = ${SRCS:.cpp=.o}
 APPS = ${SRCS:.cpp=}
 
-ARCH_FLAGS =
-STANDARD_FLAGS = -std=c++17
-WARNING_FLAGS = -Wextra -Wall -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough
-FLAVOR_FLAGS = -fno-exceptions -fno-rtti -fno-sized-deallocation
-OPTIMIZATION_FLAGS = -Os
-INCLUDE_FLAGS = -I.. -I. -I../LibC
-
-DEFINES = -DSANITIZE_PTRS -DUSERLAND
-
-CXXFLAGS = -MMD -MP $(WARNING_FLAGS) $(OPTIMIZATION_FLAGS) $(FLAVOR_FLAGS) $(ARCH_FLAGS) $(STANDARD_FLAGS) $(INCLUDE_FLAGS) $(DEFINES)
-CXX = i686-pc-serenity-g++
-LD = i686-pc-serenity-g++
-AR = i686-pc-serenity-r
-LDFLAGS = -L../LibC -L../LibCore -L../LibGUI
+DEFINES += -DUSERLAND
 
 .PHONY: all list clean
 
@@ -29,7 +18,7 @@ clean:
 	@rm -f $(APPS) $(OBJS) *.d
 
 $(APPS) : % : %.o $(OBJS)
-	@echo "LD $<"
+	@echo "LD $@"
 	@$(LD) -o $@ $(LDFLAGS) $< -lc -lgui -lcore
 
 %.o: %.cpp