diff --git a/fcst/Makefile b/fcst/Makefile
index d65b11a47..c82997771 100644
--- a/fcst/Makefile
+++ b/fcst/Makefile
@@ -26,6 +26,10 @@
 #    - install and uninstall must be made as root
 #
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 ifeq ($(KVER),)
   ifeq ($(KDIR),)
     KVER = $(shell uname -r)
@@ -58,9 +62,9 @@ include $(SUBDIRS)/Makefile_in-tree
 else
 SCST_INC_DIR := $(shell if [ -e "$$PWD/../scst" ];			\
                   then echo "$$PWD/../scst/include";			\
-                  else echo "/usr/local/include/scst"; fi)
+                  else echo "$(PREFIX)/include/scst"; fi)
 SCST_DIR := $(shell if [ -e "$$PWD/../scst" ]; then echo "$$PWD/../scst/src"; \
-		else echo "/usr/local/include/scst"; fi)
+		else echo "$(PREFIX)/include/scst"; fi)
 
 all: Modules.symvers Module.symvers
 	$(MAKE) -C $(KDIR) SUBDIRS=$(shell pwd) BUILD_INI=m \
diff --git a/iscsi-scst/Makefile b/iscsi-scst/Makefile
index 00d18b092..4290334e2 100644
--- a/iscsi-scst/Makefile
+++ b/iscsi-scst/Makefile
@@ -5,19 +5,23 @@
 # removes any old dependencies. DON'T put your own dependencies here
 # unless it's something special (not a .c file).
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 SHELL=/bin/bash
 
 SUBDIRS := $(shell pwd)
 
 SCST_INC_DIR := $(shell if [ -e "$$PWD/../scst" ];			\
                   then echo "$$PWD/../scst/include";			\
-                  else echo "/usr/local/include/scst"; fi)
+                  else echo "$(PREFIX)/include/scst"; fi)
 SCST_DIR := $(shell if [ -e "$$PWD/../scst" ]; then echo "$$PWD/../scst/src"; \
-		else echo "/usr/local/include/scst"; fi)
-SBINDIR := /usr/local/sbin
+		else echo "$(PREFIX)/include/scst"; fi)
+SBINDIR := $(PREFIX)/sbin
 INITDIR := /etc/init.d
 RCDIR := /etc/rc.d
-MANDIR := /usr/local/man
+MANDIR := $(PREFIX)/man
 KMOD := $(shell pwd)/kernel
 INCDIR := $(shell pwd)/include
 
diff --git a/iscsi-scst/usr/Makefile b/iscsi-scst/usr/Makefile
index c9a5ad2d3..6fb62c507 100644
--- a/iscsi-scst/usr/Makefile
+++ b/iscsi-scst/usr/Makefile
@@ -15,6 +15,10 @@
 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 #  GNU General Public License for more details.
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 SRCS_D = iscsid.c iscsi_scstd.c conn.c session.c target.c message.c ctldev.c \
 		log.c chap.c event.c param.c config.c isns.c md5.c sha1.c \
 		misc.c
@@ -24,7 +28,7 @@ SRCS_ADM = iscsi_adm.c param.c
 OBJS_ADM = $(SRCS_ADM:.c=.o)
 
 SCST_INC_DIR := ../../scst/include
-#SCST_INC_DIR := /usr/local/include/scst
+#SCST_INC_DIR := $(PREFIX)/include/scst
 
 CFLAGS += -O2 -fno-inline -Wall -Wextra -Wstrict-prototypes -Wno-sign-compare \
 	-Wimplicit-function-declaration -Wno-unused-parameter \
diff --git a/mpt/Makefile b/mpt/Makefile
index d99ef8540..56b19500d 100644
--- a/mpt/Makefile
+++ b/mpt/Makefile
@@ -20,7 +20,11 @@
 #    - install and uninstall must be made as root
 #
 
-#SCST_INC_DIR := /usr/local/include/scst
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
+#SCST_INC_DIR := $(PREFIX)/include/scst
 #SCST_DIR := $(SCST_INC_DIR)
 SCST_INC_DIR := $(SUBDIRS)/../scst/include
 SCST_DIR := $(shell pwd)/../scst/src
diff --git a/mvsas_tgt/Makefile b/mvsas_tgt/Makefile
index 153f65cdc..35b8a878a 100644
--- a/mvsas_tgt/Makefile
+++ b/mvsas_tgt/Makefile
@@ -25,6 +25,9 @@
 #    - install and uninstall must be made as root
 #
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
 
 ifeq ($(KVER),)
   ifeq ($(KDIR),)
@@ -38,7 +41,7 @@ endif
 export PWD    := $(shell pwd)
 export LIBSAS := m
 
-#SCST_INC_DIR := /usr/local/include/scst
+#SCST_INC_DIR := $(PREFIX)/include/scst
 #SCST_DIR := $(SCST_INC_DIR)
 SCST_INC_DIR := $(SUBDIRS)/../scst/include
 SCST_DIR := $(shell pwd)/../scst/src
diff --git a/qla2x00t/qla2x00-target/Makefile b/qla2x00t/qla2x00-target/Makefile
index 5d2e37bf6..18d9f4590 100644
--- a/qla2x00t/qla2x00-target/Makefile
+++ b/qla2x00t/qla2x00-target/Makefile
@@ -28,6 +28,10 @@
 #    - install and uninstall must be made as root
 #
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 SHELL=/bin/bash
 
 EXTRA_CFLAGS += -I$(SCST_INC_DIR)
@@ -69,10 +73,10 @@ else
 
 SCST_INC_DIR := $(shell if [ -e "$$PWD/../../scst" ];			\
                   then echo "$$PWD/../../scst/include";			\
-                  else echo "/usr/local/include/scst"; fi)
+                  else echo "$(PREFIX)/include/scst"; fi)
 SCST_DIR := $(shell if [ -e "$$PWD/../../scst" ];			\
 		    then echo "$$PWD/../../scst/src";			\
-		    else echo "/usr/local/include/scst"; fi)
+		    else echo "$(PREFIX)/include/scst"; fi)
 
 ifneq ($(BUILD_2X_MODULE),)
 # We need to make qla2xxx_scst before Module.symvers
diff --git a/scst/src/Makefile b/scst/src/Makefile
index 6e81e007b..cc06e60b2 100644
--- a/scst/src/Makefile
+++ b/scst/src/Makefile
@@ -28,6 +28,10 @@
 #    - install and uninstall must be made as root
 #
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 SHELL=/bin/bash
 
 DEV_HANDLERS_DIR = dev_handlers
@@ -118,7 +122,7 @@ INSTALL_DIR := $(DESTDIR)/lib/modules/$(shell uname -r)/extra
 else
 INSTALL_DIR := $(DESTDIR)/lib/modules/$(KVER)/extra
 endif
-INSTALL_DIR_H := $(DESTDIR)/usr/local/include/scst
+INSTALL_DIR_H := $(DESTDIR)$(PREFIX)/include/scst
 
 enable-Wextra = $(shell uname_r="$$(uname -r)"; if [ "$${uname_r%.el5}" = "$${uname_r}" ]; then echo "$(1)"; fi)
 
diff --git a/scst_local/Makefile b/scst_local/Makefile
index e2b0605ba..b3bac7a97 100644
--- a/scst_local/Makefile
+++ b/scst_local/Makefile
@@ -2,6 +2,10 @@
 # A Makefile for the scst-local ...
 #
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 SHELL=/bin/bash
 
 KMOD 		:= $(shell pwd)/kernel
@@ -34,10 +38,10 @@ else
 
 SCST_INC_DIR := $(shell if [ -e "$$PWD/../scst" ];			\
 			then echo "$$PWD/../scst/include";		\
-			else echo "/usr/local/include/scst"; fi)
+			else echo "$(PREFIX)/include/scst"; fi)
 SCST_DIR := $(shell if [ -e "$$PWD/../scst" ];				\
 		    then echo "$$PWD/../scst/src";			\
-		    else echo "/usr/local/include/scst"; fi)
+		    else echo "$(PREFIX)/include/scst"; fi)
 
 all: Modules.symvers Module.symvers
 	$(MAKE) -C $(KDIR) SUBDIRS=$(shell pwd) BUILD_INI=m \
diff --git a/scstadmin/Makefile b/scstadmin/Makefile
index f874bae06..57b90a5b5 100644
--- a/scstadmin/Makefile
+++ b/scstadmin/Makefile
@@ -1,10 +1,14 @@
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 SCSTADMIN_DIR = $(shell if [ ! -h scstadmin ]; then		\
 			    rm -f scstadmin;			\
 			    ln -s scstadmin.sysfs scstadmin;	\
 			fi;					\
 			echo scstadmin)
 
-MANDIR := $(DESTDIR)/usr/local/man
+MANDIR := $(DESTDIR)$(PREFIX)/man
 INITDIR := $(shell if [ -f /etc/slackware-version ]; then	\
                      echo /etc/rc.d;				\
                    else						\
diff --git a/scstadmin/scstadmin.procfs/Makefile b/scstadmin/scstadmin.procfs/Makefile
index 715fed166..a81c18f26 100644
--- a/scstadmin/scstadmin.procfs/Makefile
+++ b/scstadmin/scstadmin.procfs/Makefile
@@ -1,7 +1,11 @@
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 MODULE_VERSION = 0.8.22
 TOOL = scstadmin
 
-SBINDIR := $(PREFIX)/usr/local/sbin
+SBINDIR := $(PREFIX)$(PREFIX)/sbin
 
 all: perl-module
 
diff --git a/scstadmin/scstadmin.sysfs/Makefile b/scstadmin/scstadmin.sysfs/Makefile
index a2ce58a60..42b509479 100644
--- a/scstadmin/scstadmin.sysfs/Makefile
+++ b/scstadmin/scstadmin.sysfs/Makefile
@@ -1,7 +1,11 @@
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 MODULE_VERSION = 0.9.10
 TOOL = scstadmin
 
-SBINDIR := /usr/local/sbin
+SBINDIR := $(PREFIX)/sbin
 
 all: perl-module
 
diff --git a/srpt/Makefile b/srpt/Makefile
index 57586110b..046026325 100644
--- a/srpt/Makefile
+++ b/srpt/Makefile
@@ -1,13 +1,16 @@
 #
 # Makefile for ib_srpt.ko.
 #
+ifndef PREFIX
+	PREFIX=/usr/local
+endif
 
 SCST_INC_DIR := $(shell if [ -e "$$PWD/../scst" ];			\
 			then echo "$$PWD/../scst/include";		\
-			else echo "/usr/local/include/scst"; fi)
+			else echo "$(PREFIX)/include/scst"; fi)
 SCST_SYMVERS_DIR := $(shell if [ -e $$PWD/../scst ]; then	\
                         echo $$PWD/../scst/src;			\
-                      else echo /usr/local/include/scst; fi)
+                      else echo $(PREFIX)/include/scst; fi)
 SUBDIRS := $(shell pwd)
 
 ifeq ($(KVER),)
diff --git a/usr/fileio/Makefile b/usr/fileio/Makefile
index 308e39a87..3be1b4d48 100644
--- a/usr/fileio/Makefile
+++ b/usr/fileio/Makefile
@@ -15,6 +15,10 @@
 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 #  GNU General Public License for more details.
 
+ifndef PREFIX
+        PREFIX=/usr/local
+endif
+
 SHELL=/bin/bash
 
 SRCS_F = fileio.c common.c debug.c crc32.c
@@ -24,8 +28,8 @@ OBJS_F = $(SRCS_F:.c=.o)
 #OBJS_C = $(SRCS_C:.c=.o)
 
 SCST_INC_DIR := ../../scst/include
-#SCST_INC_DIR := /usr/local/include/scst
-INSTALL_DIR := /usr/local/bin/scst
+#SCST_INC_DIR := $(PREFIX)/include/scst
+INSTALL_DIR := $(PREFIX)/bin/scst
 
 CFLAGS += -O2 -Wall -Wextra -Wno-unused-parameter -Wstrict-prototypes \
 	-I$(SCST_INC_DIR) -D_GNU_SOURCE -D__USE_FILE_OFFSET64 \