diff --git a/Makefile b/Makefile
index 7b3a6e3..8a35823 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
 PACKAGE	= Keyboard
 VERSION	= 0.2.1
 SUBDIRS	= data include po src tools
-RM	?= rm -f
-LN	?= ln -f
-TAR	?= tar -czvf
+RM	= rm -f
+LN	= ln -f
+TAR	= tar -czvf
 
 
 all: subdirs
diff --git a/data/Makefile b/data/Makefile
index 0d4c9ad..0ddf7f9 100644
--- a/data/Makefile
+++ b/data/Makefile
@@ -1,8 +1,8 @@
 PREFIX	= /usr/local
 DESTDIR	=
-MKDIR	?= mkdir -p
-INSTALL	?= install
-RM	?= rm -f
+MKDIR	= mkdir -p
+INSTALL	= install
+RM	= rm -f
 
 
 all:
diff --git a/include/Makefile b/include/Makefile
index c507cbc..88a5223 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -1,9 +1,9 @@
 PREFIX	= /usr/local
 DESTDIR	=
-RM	?= rm -f
-LN	?= ln -f
-MKDIR	?= mkdir -p
-INSTALL	?= install
+RM	= rm -f
+LN	= ln -f
+MKDIR	= mkdir -p
+INSTALL	= install
 INCLUDEDIR= $(PREFIX)/include
 
 
diff --git a/po/Makefile b/po/Makefile
index 72adfa3..590a186 100644
--- a/po/Makefile
+++ b/po/Makefile
@@ -1,10 +1,10 @@
 TARGETS	= Keyboard.pot fr.mo
 PREFIX	= /usr/local
 DESTDIR	=
-RM	?= rm -f
-LN	?= ln -f
-MKDIR	?= mkdir -p
-INSTALL	?= install
+RM	= rm -f
+LN	= ln -f
+MKDIR	= mkdir -p
+INSTALL	= install
 
 
 all: $(TARGETS)
diff --git a/src/Makefile b/src/Makefile
index 10dea77..a76a6ac 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2,16 +2,17 @@ TARGETS	= keyboard keyboardctl
 PREFIX	= /usr/local
 DESTDIR	=
 BINDIR	= $(PREFIX)/bin
-CC	?= cc
-CPPFLAGSF?=
-CPPFLAGS?=
+SBINDIR	= $(PREFIX)/sbin
+CC	= cc
+CPPFLAGSF=
+CPPFLAGS=
 CFLAGSF	= -W `pkg-config --cflags libDesktop`
 CFLAGS	= -Wall -g -pedantic
 LDFLAGSF= `pkg-config --libs libDesktop`
-RM	?= rm -f
-LN	?= ln -f
-MKDIR	?= mkdir -p
-INSTALL	?= install
+RM	= rm -f
+LN	= ln -f
+MKDIR	= mkdir -p
+INSTALL	= install
 
 
 all: $(TARGETS)
diff --git a/tools/Makefile b/tools/Makefile
index fdcf548..7c32be7 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -2,16 +2,17 @@ TARGETS	= plug snooper xkey
 PREFIX	= /usr/local
 DESTDIR	=
 BINDIR	= $(PREFIX)/bin
-CC	?= cc
-CPPFLAGSF?=
-CPPFLAGS?=
+SBINDIR	= $(PREFIX)/sbin
+CC	= cc
+CPPFLAGSF=
+CPPFLAGS=
 CFLAGSF	= -W `pkg-config --cflags gtk+-2.0`
 CFLAGS	= -Wall -g -O2
 LDFLAGSF= `pkg-config --libs gtk+-2.0`
-RM	?= rm -f
-LN	?= ln -f
-MKDIR	?= mkdir -p
-INSTALL	?= install
+RM	= rm -f
+LN	= ln -f
+MKDIR	= mkdir -p
+INSTALL	= install
 
 
 all: $(TARGETS)