--- Makefile.orig	2018-09-27 08:46:20.000000000 -0400
+++ Makefile	2018-09-27 10:09:41.000000000 -0400
@@ -575,7 +575,7 @@
 ifeq ($(target),Darwin)
 
 # default INCDIR for macOS
-INCDIR= /usr/local/include
+INCDIR=___SDK_PREFIX___/usr/include
 
 else
 #endif	/* end of skip for non-Gnu makefiles */
@@ -638,7 +638,7 @@
 ifeq ($(target),Darwin)
 
 # default BINDIR for macOS
-BINDIR= /usr/local/bin
+BINDIR= ___PREFIX___/bin
 
 else
 #endif	/* end of skip for non-Gnu makefiles */
@@ -654,7 +654,7 @@
 ifeq ($(target),Darwin)
 
 # default LIBDIR for macOS
-LIBDIR= /usr/local/lib
+LIBDIR= ___PREFIX___/lib
 
 else
 #endif	/* end of skip for non-Gnu makefiles */
@@ -670,7 +670,7 @@
 ifeq ($(target),Darwin)
 
 # default CALC_SHAREDIR for macOS
-CALC_SHAREDIR= /usr/local/share/calc
+CALC_SHAREDIR= ___PREFIX___/share/calc
 
 else
 #endif	/* end of skip for non-Gnu makefiles */
@@ -690,7 +690,7 @@
 #
 #CALC_INCDIR= /usr/local/include/calc
 #CALC_INCDIR= /dev/env/DJDIR/include/calc
-CALC_INCDIR= ${INCDIR}/calc
+CALC_INCDIR= ___PREFIX___/include/calc
 
 # By default, these values are based CALC_SHAREDIR, INCDIR, BINDIR
 # ---------------------------------------------------------------
@@ -760,7 +760,7 @@
 #MANDIR=
 #MANDIR= /usr/local/man/man1
 #MANDIR= /usr/man/man1
-MANDIR= /usr/share/man/man1
+MANDIR= ___PREFIX___/share/man/man1
 #MANDIR= /dev/env/DJDIR/man/man1
 #MANDIR= /usr/man/u_man/man1
 #MANDIR= /usr/contrib/man/man1
@@ -895,11 +895,11 @@
 #
 # If in doubt, set USE_READLINE, READLINE_LIB and READLINE_INCLUDE to nothing.
 #
-USE_READLINE=
-#USE_READLINE= -DUSE_READLINE
+#USE_READLINE=
+USE_READLINE= -DUSE_READLINE
 #
-READLINE_LIB=
-READLINE_EXTRAS=
+#READLINE_LIB=
+#READLINE_EXTRAS=
 #
 #READLINE_LIB= -lreadline
 #READLINE_EXTRAS= -lhistory -lncurses
@@ -910,6 +910,9 @@
 #READLINE_LIB= -L/usr/local/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:
 #
@@ -1314,8 +1317,8 @@
 CCOPT= ${DEBUG}
 CCMISC= ${DARWIN_ARCH}
 #
-LCC= clang
-CC= ${PURIFY} ${LCC} ${CCWERR}
+LCC= ${CC}
+#CC= ${PURIFY} ${LCC} ${CCWERR}
 #
 # Darwin dynamic shared lib filenames
 LIB_EXT:= .dylib
@@ -2176,7 +2179,7 @@
 #
 ###
 
-all: check_include ${BLD_TYPE} CHANGES
+all: ${BLD_TYPE} CHANGES
 
 check_include:
 	$(Q) if [ ! -d /usr/include ]; then \
@@ -4528,7 +4531,7 @@
 	else \
 	    ${TRUE}; \
 	fi
-	-${Q} if [ ! -d ${T}${INCDIR} ]; then \
+	-${Q} if /usr/bin/false; then \
 	    echo ${MKDIR} -p ${T}${INCDIR}; \
 	    ${MKDIR} -p ${T}${INCDIR}; \
 	    echo ${CHMOD} 0755 ${T}${INCDIR}; \