Makefile: needs GNU Make 3.81

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@10020 85f007b7-540e-0410-9357-904b9bb8a0f7

2 files changed, 23 insertions, 3 deletions

diff --git a/INSTALL b/INSTALL
index da1ec753e..f5e2ca8da 100644
--- a/INSTALL
+++ b/INSTALL
@@ -38,10 +38,26 @@ WHAT DO YOU NEED ?
      - Objective Caml version 3.07 or later
        (available at http://caml.inria.fr/)
 
-     - GNU Make version 3.80 or later
-       (available at http://www.gnu.org/software/make/, but also a
+     - GNU Make version 3.81 or later
+       (
+	available at http://www.gnu.org/software/make/, but also a
         standard or optional add-on part to most Unices and Unix
-        clones, sometimes under the name "gmake".)
+        clones, sometimes under the name "gmake".
+
+	If a new enough version is not included in your system, nor
+        easily available as an add-on, this should get you a working
+        make:
+
+	#Download it (wget is an example, use your favourite FTP or HTTP client)
+	wget http://ftp.gnu.org/pub/gnu/make/make-3.81.tar.bz2
+	bzip9 -cd make-3.81.tar.bz2 | tar x
+	#If you don't have bzip2, you can download the gzipped version instead.
+        cd make-3.81
+        ./configure --prefix=$(HOME)
+	make install
+
+	Then, make sure that $(HOME)/bin is first in your $PATH.
+       )
 
      - a C compiler
 
diff --git a/Makefile.build b/Makefile.build
index 3e92347e5..f246e20ed 100644
--- a/Makefile.build
+++ b/Makefile.build
@@ -104,6 +104,10 @@ endef
 
 $(foreach f,$(.FEATURES),$(eval $(call order-only-template,$(f))))
 
+ifndef ORDER_ONLY_SEP
+$(error This Makefile needs GNU Make 3.81 or later (that is a version that supports the order-only dependency feature without major bugs.))
+endif
+
 VO_TOOLS_DEP := $(BESTCOQTOP)
 ifdef COQ_XML
  VO_TOOLS_DEP += $(COQDOC)