--- Makefile.orig	2015-11-18 20:12:06 UTC
+++ Makefile
@@ -19,29 +19,30 @@
 SHELL = /bin/sh
 
 # Directories (private version)
-HOMEDIR = ../home
-INCDIR = ../home/p2c
-BINDIR = ..
-LIBDIR = ../home
-MANDIR = ../home
-MANFILE = p2c.cat          # human-readable manual (for cat.1)
+#HOMEDIR = ../home
+#INCDIR = ../home/p2c
+#BINDIR = ..
+#LIBDIR = ../home
+#MANDIR = ../home
+#MANFILE = p2c.cat          # human-readable manual (for cat.1)
 #MANFILE = p2c.man.inst    # uncompressed nroff source (for man.1)
 #MANFILE = p2c.man.Z       # compressed nroff source (for man.1.Z)
 
 # Directories (public version)
-#HOMEDIR = /usr/lib/p2c
-#INCDIR = /usr/include/p2c
-#BINDIR = /usr/bin
-#LIBDIR = /usr/lib
-#MANDIR = /usr/man/man1
-#MANFILE = p2c.man.inst
+PREFIX ?= /usr/local
+HOMEDIR = $(PREFIX)/lib/p2c
+INCDIR = $(PREFIX)/include/p2c
+BINDIR = $(PREFIX)/bin
+LIBDIR = $(PREFIX)/lib
+MANDIR = $(PREFIX)/man/man1
+MANFILE = p2c.man.inst
 
 # Compiler options
-CC = cc                    # you may wish to use gcc here instead
+CC ?= cc                    # you may wish to use gcc here instead
 OPT = # -O		   # uncomment this for optimization
 DEB = # -g		   # uncomment this for debugging
 DEFS =	-DTEST_MALLOC      # place other -D types of things here # TDS 2015nov18
-CFLAGS = $(OPT) $(DEB) $(DEFS)
+CFLAGS += $(OPT) $(DEB) $(DEFS)
 LFLAGS =
 
 
@@ -64,9 +65,9 @@ LIBSRCS = p2clib.c loc.p2clib.c
 LIBOBJS = p2clib.o loc.p2clib.o
 OTHERLIBOBJS =
 
-ABSHOMEDIR = `cd $(HOMEDIR); pwd`
-ABSINCDIR = `cd $(INCDIR); pwd`
-ABSLIBDIR = `cd $(LIBDIR); pwd`
+ABSHOMEDIR = $(HOMEDIR)
+ABSINCDIR = $(INCDIR)
+ABSLIBDIR = $(LIBDIR)
 
 MISCSRCS = makeproto.c
 PROTOS = p2c.proto p2c.hdrs
@@ -128,7 +129,6 @@ p2cc: p2cc.perl
 	sed -e "s;--HOMEDIR--;$(ABSHOMEDIR);"   \
 	    -e "s;--INCDIR--;$(ABSINCDIR);"     \
 	    -e "s;--LIBDIR--;$(ABSLIBDIR);"     \
-	    -e "s;/bin/perl;`which perl`;"      \
 	    p2cc.perl >p2cc
 	chmod a+x p2cc