diff --git a/Makefile b/Makefile
index 9b5b759..73c9d1e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
 PACKAGE	= libDatabase
 VERSION	= 0.0.0
 SUBDIRS	= data doc include src
-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 020e963..15c2704 100644
--- a/data/Makefile
+++ b/data/Makefile
@@ -1,10 +1,10 @@
 TARGETS	= libDatabase.pc
 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/doc/Makefile b/doc/Makefile
index f0bfcf9..7d06cfc 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -2,10 +2,10 @@ SUBDIRS	= gtkdoc
 TARGETS	= gtkdoc/libDatabase.types gtkdoc/tmpl.stamp gtkdoc/sgml.stamp gtkdoc/html.stamp
 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: subdirs $(TARGETS)
diff --git a/include/Database/Makefile b/include/Database/Makefile
index a3aff3d..7acc330 100644
--- a/include/Database/Makefile
+++ b/include/Database/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/include/Makefile b/include/Makefile
index 36e76e0..2bd42de 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -1,10 +1,10 @@
 SUBDIRS	= Database
 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/src/Makefile b/src/Makefile
index d9b82b2..0e26276 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -3,18 +3,18 @@ TARGETS	= libDatabase.a libDatabase.so.0.0 libDatabase.so.0 libDatabase.so
 PREFIX	= /usr/local
 DESTDIR	=
 LIBDIR	= $(PREFIX)/lib
-CC	?= cc
+CC	= cc
 CPPFLAGSF= -I ../include
-CPPFLAGS?=
+CPPFLAGS=
 CFLAGSF	= -W -fPIC
 CFLAGS	= -Wall -g -O2 -pedantic
-AR	?= ar
-RANLIB	?= ranlib
-CCSHARED?= $(CC) -shared
-RM	?= rm -f
-LN	?= ln -f
-MKDIR	?= mkdir -p
-INSTALL	?= install
+AR	= ar
+RANLIB	= ranlib
+CCSHARED= $(CC) -shared
+RM	= rm -f
+LN	= ln -f
+MKDIR	= mkdir -p
+INSTALL	= install
 
 
 all: subdirs $(TARGETS)
diff --git a/src/engines/Makefile b/src/engines/Makefile
index 0152f1d..41aa1e7 100644
--- a/src/engines/Makefile
+++ b/src/engines/Makefile
@@ -2,18 +2,18 @@ TARGETS	= pdo.so pgsql.so sqlite2.so sqlite3.so template.so
 PREFIX	= /usr/local
 DESTDIR	=
 LIBDIR	= $(PREFIX)/lib
-CC	?= cc
+CC	= cc
 CPPFLAGSF= -I ../../include
-CPPFLAGS?=
+CPPFLAGS=
 CFLAGSF	= -W -fPIC
 CFLAGS	= -Wall -g -O2 -pedantic
-AR	?= ar
-RANLIB	?= ranlib
-CCSHARED?= $(CC) -shared
-RM	?= rm -f
-LN	?= ln -f
-MKDIR	?= mkdir -p
-INSTALL	?= install
+AR	= ar
+RANLIB	= ranlib
+CCSHARED= $(CC) -shared
+RM	= rm -f
+LN	= ln -f
+MKDIR	= mkdir -p
+INSTALL	= install
 
 
 all: $(TARGETS)