cat $(MDDEPEND_FILES) since < only redirects the first file. Use <STDIN> instead of <> to clear up potential ambigiousness. r=bryner

build/unix/mddepend.pl

@@ -48,7 +48,7 @@ while ($line = <STDIN>) {
   }
   $deps = [ $obj, split /\s+/, $rest ];
 
-  while ($hasSlash and $line = <>) {
+  while ($hasSlash and $line = <STDIN>) {
     chomp $line;
     if ($line =~ /\\$/) {
       chop $line;

config/rules.mk

@@ -1545,7 +1545,7 @@ ifdef PERL
 # because it handles the case when header files are removed from the build.
 # 'make' would complain that there is no way to build missing headers.
 $(MDDEPDIR)/.all.pp: FORCE
-	@$(PERL) $(BUILD_TOOLS)/mddepend.pl $@ < $(MDDEPEND_FILES) 
+	@cat $(MDDEPEND_FILES) | $(PERL) $(BUILD_TOOLS)/mddepend.pl $@
 -include $(MDDEPDIR)/.all.pp
 else
 include $(MDDEPEND_FILES)