--- a/NewMakefile.gmk	Mon Oct 21 10:40:16 2013 +0200
+++ b/NewMakefile.gmk	Mon Oct 21 11:59:25 2013 +0200
@@ -36,10 +36,8 @@
 TEST_FOR_NON_GNUMAKE:sh=echo You are not using GNU make/gmake, this is a requirement. Check your path. 1>&2 && exit 1
 
 # Assume we have GNU make, but check version.
-ifeq (,$(findstring 3.81,$(MAKE_VERSION)))
-  ifeq (,$(findstring 3.82,$(MAKE_VERSION)))
-    $(error This version of GNU Make is too low ($(MAKE_VERSION)). Check your path, or upgrade to 3.81 or newer.)
-  endif
+ifeq ($(strip $(foreach v, 3.81 3.82 4.%, $(filter $v, $(MAKE_VERSION)))), )
+  $(error This version of GNU Make is too low ($(MAKE_VERSION)). Check your path, or upgrade to 3.81 or newer.)
 endif
 
 # Locate this Makefile

--- a/common/autoconf/basics.m4	Mon Oct 21 10:40:16 2013 +0200
+++ b/common/autoconf/basics.m4	Mon Oct 21 11:59:25 2013 +0200
@@ -502,7 +502,7 @@
     if test "x$IS_GNU_MAKE" = x; then
       AC_MSG_NOTICE([Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring.])
     else
-      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '3.8[[12346789]]'`
+      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '\(3\.8[[12]]\)\|\(4\.\)'`
       if test "x$IS_MODERN_MAKE" = x; then
         AC_MSG_NOTICE([Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring.])
       else

--- a/common/autoconf/generated-configure.sh	Mon Oct 21 10:40:16 2013 +0200
+++ b/common/autoconf/generated-configure.sh	Mon Oct 21 11:59:25 2013 +0200
@@ -3822,7 +3822,7 @@
 #CUSTOM_AUTOCONF_INCLUDE
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1382084973
+DATE_WHEN_GENERATED=1382349488
 
 ###############################################################################
 #
@@ -8273,7 +8273,7 @@
       { $as_echo "$as_me:${as_lineno-$LINENO}: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&5
 $as_echo "$as_me: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&6;}
     else
-      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '3.8[12346789]'`
+      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '\(3\.8[12]\)\|\(4\.\)'`
       if test "x$IS_MODERN_MAKE" = x; then
         { $as_echo "$as_me:${as_lineno-$LINENO}: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&5
 $as_echo "$as_me: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&6;}
@@ -8630,7 +8630,7 @@
       { $as_echo "$as_me:${as_lineno-$LINENO}: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&5
 $as_echo "$as_me: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&6;}
     else
-      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '3.8[12346789]'`
+      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '\(3\.8[12]\)\|\(4\.\)'`
       if test "x$IS_MODERN_MAKE" = x; then
         { $as_echo "$as_me:${as_lineno-$LINENO}: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&5
 $as_echo "$as_me: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&6;}
@@ -8984,7 +8984,7 @@
       { $as_echo "$as_me:${as_lineno-$LINENO}: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&5
 $as_echo "$as_me: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&6;}
     else
-      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '3.8[12346789]'`
+      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '\(3\.8[12]\)\|\(4\.\)'`
       if test "x$IS_MODERN_MAKE" = x; then
         { $as_echo "$as_me:${as_lineno-$LINENO}: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&5
 $as_echo "$as_me: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&6;}
@@ -9343,7 +9343,7 @@
       { $as_echo "$as_me:${as_lineno-$LINENO}: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&5
 $as_echo "$as_me: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&6;}
     else
-      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '3.8[12346789]'`
+      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '\(3\.8[12]\)\|\(4\.\)'`
       if test "x$IS_MODERN_MAKE" = x; then
         { $as_echo "$as_me:${as_lineno-$LINENO}: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&5
 $as_echo "$as_me: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&6;}
@@ -9696,7 +9696,7 @@
       { $as_echo "$as_me:${as_lineno-$LINENO}: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&5
 $as_echo "$as_me: Found potential make at $MAKE_CANDIDATE, however, this is not GNU Make. Ignoring." >&6;}
     else
-      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '3.8[12346789]'`
+      IS_MODERN_MAKE=`$ECHO $MAKE_VERSION_STRING | $GREP '\(3\.8[12]\)\|\(4\.\)'`
       if test "x$IS_MODERN_MAKE" = x; then
         { $as_echo "$as_me:${as_lineno-$LINENO}: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&5
 $as_echo "$as_me: Found GNU make at $MAKE_CANDIDATE, however this is not version 3.81 or later. (it is: $MAKE_VERSION_STRING). Ignoring." >&6;}