Index: bin/automake.in
--- bin/automake.in.orig
+++ bin/automake.in
@@ -3872,7 +3872,7 @@ sub substitute_ac_subst_variables_worker
 sub substitute_ac_subst_variables
 {
   my ($text) = @_;
-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+  $text =~ s/\$[{]([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
   return $text;
 }
 
@@ -5089,6 +5089,7 @@ sub scan_autoconf_traces
 		_LT_AC_TAGCONFIG => 0,
 		m4_include => 1,
 		m4_sinclude => 1,
+		include => 1,
 		sinclude => 1,
 	      );
 
@@ -5112,6 +5113,7 @@ sub scan_autoconf_traces
       my ($here, $depth, @args) = split (/::/);
       $where = new Automake::Location $here;
       my $macro = $args[0];
+      next if ($macro eq "include");
 
       prog_error ("unrequested trace '$macro'")
 	unless exists $traced{$macro};