--- ed-1.13.orig/configure	2016-01-24 18:54:47.000000000 +0100
+++ ed-1.13/configure	2016-04-08 23:14:47.326189488 +0200
@@ -14,17 +14,17 @@ srctrigger=doc/${pkgname}.texi
 LC_ALL=C
 export LC_ALL
 srcdir=
-prefix=/usr/local
+prefix=/usr
 exec_prefix='$(prefix)'
 bindir='$(exec_prefix)/bin'
 datarootdir='$(prefix)/share'
 infodir='$(datarootdir)/info'
 mandir='$(datarootdir)/man'
 program_prefix=
-CC=gcc
-CPPFLAGS=
-CFLAGS='-Wall -W -O2'
-LDFLAGS=
+CC?=gcc
+CPPFLAGS?=
+CFLAGS?='-Wall -W -O2'
+LDFLAGS?=
 
 # checking whether we are using GNU C.
 ${CC} --version > /dev/null 2>&1