--- a/include/package.mk
+++ b/include/package.mk
@@ -163,13 +163,14 @@
     endif
 
     DUMPINFO += \
+	if [ "$$$$PREREQ_CHECK" = 1 ]; then echo "Prereq-Check: 1"; fi; \
 	echo "Version: $(VERSION)"; \
 	echo "Depends: $$(IDEPEND_$(1))"; \
 	echo "Build-Depends: $(PKG_BUILDDEP)"; \
 	echo "Category: $(CATEGORY)"; \
 	echo "Title: $(TITLE)"; \
 	echo "Description: $(DESCRIPTION)" | sed -e 's,\\,\n,g';
-
+	
     ifneq ($(URL),)
       DUMPINFO += \
 	echo; \

--- a/include/prereq.mk
+++ b/include/prereq.mk
@@ -22,6 +22,7 @@
 .SILENT: $(TMP_DIR) prereq
 
 define Require
+  export PREREQ_CHECK=1
   ifeq ($$(CHECK_$(1)),)
     prereq: prereq-$(1)
 

--- a/package/Makefile
+++ b/package/Makefile
@@ -10,7 +10,7 @@
 include $(TOPDIR)/.config
 include $(TOPDIR)/.pkgdeps
 
-PREREQ_PACKAGES:=$(patsubst %,%-prereq,$(package-y) $(package-m))
+PREREQ_PACKAGES:=$(patsubst %,%-prereq,$(package-prereq))
 DOWNLOAD_PACKAGES:=$(patsubst %,%-download,$(package-y) $(package-m))
 COMPILE_PACKAGES:=$(patsubst %,%-compile,$(package-y) $(package-m))
 INSTALL_PACKAGES:=$(patsubst %,%-install,$(package-y))

--- a/scripts/gen_deps.pl
+++ b/scripts/gen_deps.pl
@@ -13,6 +13,8 @@
 my $makefile;
 my %conf;
 my %pkg;
+my %prereq;
+my $prereq;
 my %dep;
 my %options;
 my $opt;
@@ -32,6 +34,10 @@
 		$name = $1;
 		defined $pkg{$name} or $pkg{$name} = {};
 		$pkg{$name}->{src} = $src;
+	};
+	$line =~ /^Prereq-Check:/ and !defined $prereq{$src} and do {
+		$prereq{$src} = 1;
+		$prereq .= "package-prereq += $src\n";
 	};
 	$line =~ /^(Build-)?Depends: \s*(.+)\s*$/ and do {
 		$pkg{$name}->{depends} ||= [];
@@ -75,6 +81,6 @@
 }
 
 if ($line ne "") {
-	print "\n$line";
+	print "\n$line\n$prereq";
 }