--- a/Makefile.config
+++ b/Makefile.config
@@ -135,7 +135,7 @@
 #
 #	PREFIX= /usr/local
 #
-PREFIX= /usr/local
+PREFIX ?= /usr/local
 #PREFIX= /usr
 #PREFIX= /usr/global
 
@@ -838,8 +838,8 @@
 #
 else	# ($(target),Darwin)
 
-INCDIR= /usr/include
-#INCDIR= ${PREFIX}/include
+#INCDIR= /usr/include
+INCDIR= ${PREFIX}/include
 #INCDIR= /dev/env/DJDIR/include
 
 endif	# ($(target),Darwin)
@@ -898,16 +898,16 @@
 # defaults for non-macOS
 else	# ($(target),Darwin)
 # default BINDIR for non-macOS
-BINDIR= /usr/bin
-#BINDIR= ${PREFIX}/bin
+#BINDIR= /usr/bin
+BINDIR= ${PREFIX}/bin
 #BINDIR= /dev/env/DJDIR/bin
 # default LIBDIR for non-macOS
-LIBDIR= /usr/lib
-#LIBDIR= ${PREFIX}/lib
+#LIBDIR= /usr/lib
+LIBDIR= ${PREFIX}/lib
 #LIBDIR= /dev/env/DJDIR/lib
 # default CALC_SHAREDIR for non-macOS
-CALC_SHAREDIR= /usr/share/calc
-#CALC_SHAREDIR= ${PREFIX}/lib/calc
+#CALC_SHAREDIR= /usr/share/calc
+CALC_SHAREDIR= ${PREFIX}/lib/calc
 #CALC_SHAREDIR= /dev/env/DJDIR/share/calc
 endif	# ($(target),Darwin)
 
@@ -944,7 +944,7 @@
 CUSTOMCALDIR= ${CALC_SHAREDIR}/custom
 CUSTOMHELPDIR= ${CALC_SHAREDIR}/custhelp
 CUSTOMINCDIR= ${CALC_INCDIR}/custom
-SCRIPTDIR= ${BINDIR}/cscript
+SCRIPTDIR= ${CALC_SHAREDIR}/cscript
 
 # T - top level directory under which calc will be installed
 #
@@ -986,7 +986,7 @@
 #
 # If in doubt, use T=
 #
-T=
+T=${DESTDIR}
 
 # where man section 1 pages are installed
 #
@@ -1003,11 +1003,11 @@
 #MANDIR= ${PREFIX}/man/man1
 #MANDIR= /usr/man/man1
 #
-ifeq ($(target),Darwin)
+#ifeq ($(target),Darwin)
 MANDIR= ${PREFIX}/share/man/man1
-else	# ($(target),Darwin)
-MANDIR= /usr/share/man/man1
-endif	# ($(target),Darwin)
+#else	# ($(target),Darwin)
+#MANDIR= /usr/share/man/man1
+#endif	# ($(target),Darwin)
 #MANDIR= /dev/env/DJDIR/man/man1
 #MANDIR= /usr/man/u_man/man1
 #MANDIR= /usr/contrib/man/man1
@@ -1163,14 +1163,14 @@
 #READLINE_LIB=
 #READLINE_EXTRAS=
 #
-READLINE_LIB= -lreadline
-READLINE_EXTRAS= -lhistory -lncurses
+#READLINE_LIB= -lreadline
+#READLINE_EXTRAS= -lhistory -lncurses
 #
 #READLINE_LIB= -L/usr/gnu/lib -lreadline
 #READLINE_EXTRAS= -lhistory -lncurses
 #
-#READLINE_LIB= -L${PREFIX}/lib -lreadline
-#READLINE_EXTRAS= -lhistory -lncurses
+READLINE_LIB= -L${PREFIX}/lib -lreadline
+READLINE_EXTRAS= -lhistory -lncurses
 #
 # For Apple OS X: install fink from http://fink.sourceforge.net
 #		  and then do a 'fink install readline' and then use:
@@ -1187,9 +1187,9 @@
 #READLINE_LIB= -L${PREFIX}/opt/readline/lib -lreadline
 #READLINE_EXTRAS= -lhistory -lncurses
 #
-READLINE_INCLUDE=
+#READLINE_INCLUDE=
 #READLINE_INCLUDE= -I/usr/gnu/include
-#READLINE_INCLUDE= -I${PREFIX}/include
+READLINE_INCLUDE= -I${PREFIX}/include
 
 # Handle the case where macOS is being used with HomeBrew
 # # and using the readline, history, and ncurses libraries.
@@ -1241,7 +1241,7 @@
 # a *.a link library.  Set RANLIB to the utility that performs this
 # action.  Set RANLIB to : if your system does not need such a utility.
 #
-RANLIB=ranlib
+RANLIB?=ranlib
 #RANLIB=:
 
 # If you do not wish to use purify, set PURIFY to an empty string.
@@ -1317,7 +1317,7 @@
 
 # standard utilities used during make
 #
-AR= ar
+AR?= ar
 AWK= awk
 CAT= cat
 CHMOD= chmod
@@ -1332,7 +1332,7 @@
 GREP= grep
 HOSTNAME= hostname
 LANG= C
-LDCONFIG= ldconfig
+LDCONFIG=
 LN= ln
 LS= ls
 MAKE= make