Upstream-Status: Backport

It's fixed in 4.6 and 4.7(HEAD)

http://sourceforge.net/tracker/?func=detail&aid=3523591&group_id=2055&atid=102055

diff -uNr gnuplot-4.4.4.orig/Makefile.am gnuplot-4.4.4/Makefile.am
--- gnuplot-4.4.4.orig/Makefile.am	2012-07-20 10:54:49.075828905 +0200
+++ gnuplot-4.4.4/Makefile.am	2012-07-20 10:55:22.380831313 +0200
@@ -1,5 +1,5 @@
 ## Process this file with automake to produce Makefile.in -*-Makefile-*-
-AUTOMAKE_OPTIONS = foreign 1.2h
+AUTOMAKE_OPTIONS = foreign
 
 SUBDIRS = config m4 term src  $(LISPDIR) man share
 
diff -uNr gnuplot-4.4.4.orig/configure.in gnuplot-4.4.4/configure.in
--- gnuplot-4.4.4.orig/configure.in	2011-09-02 06:09:40.000000000 +0200
+++ gnuplot-4.4.4/configure.in	2012-07-20 10:55:53.289833224 +0200
@@ -16,10 +16,11 @@
 dnl configure.in body
 
 dnl Compiler characteristics
-dnl Check for ANSI C prototypes, the const and inline keywords,
-dnl and ANSI style stringification
+dnl Check for the const and inline keywords and ANSI style stringification
+dnl automake 1.12 dropped support for AM_C_PROTOTYPES and ansi2knr
+dnl But our code still tests for #ifdef PROTOTYPES, so define it here
+AC_DEFINE(PROTOTYPES,1,[Automake 1.12 dropped support for building without prototypes])
 AC_PROG_CC
-AM_C_PROTOTYPES
 AC_PROG_CPP
 AC_C_CONST
 AC_C_INLINE
diff -uNr gnuplot-4.4.4.orig/src/Makefile.am gnuplot-4.4.4/src/Makefile.am
--- gnuplot-4.4.4.orig/src/Makefile.am	2010-10-06 06:53:16.000000000 +0200
+++ gnuplot-4.4.4/src/Makefile.am	2012-07-20 10:56:02.376834548 +0200
@@ -1,5 +1,5 @@
 ## Process this file with automake to produce Makefile.in -*-Makefile-*-
-AUTOMAKE_OPTIONS = ansi2knr foreign 1.2h
+AUTOMAKE_OPTIONS = foreign
 
 # in the spirit of automake ...
 pkglibexecdir = $(libexecdir)/@PACKAGE@/@VERSION_MAJOR@
