diff --git a/pkgs/build-support/vm/deb/deb-closure.pl b/pkgs/build-support/vm/deb/deb-closure.pl
index 887077037e28..bed397d6f07e 100644
--- a/pkgs/build-support/vm/deb/deb-closure.pl
+++ b/pkgs/build-support/vm/deb/deb-closure.pl
@@ -46,17 +46,27 @@ sub getDeps {
 }
 
 
-# Process the "Provides" fields to be able to resolve virtual dependencies.
+# Process the "Provides" and "Replaces" fields to be able to resolve
+# virtual dependencies.
 my %provides;
 
 foreach my $cdata (values %packages) {
-    next unless defined $cdata->{Provides};
-    my @provides = getDeps(Dpkg::Deps::deps_parse($cdata->{Provides}));
-    foreach my $name (@provides) {
-        #die "conflicting provide: $name\n" if defined $provides{$name};
-        #warn "provide by $cdata->{Package} conflicts with package with the same name: $name\n";
-        next if defined $packages{$name};
-        $provides{$name} = $cdata->{Package};
+    if (defined $cdata->{Provides}) {
+        my @provides = getDeps(Dpkg::Deps::deps_parse($cdata->{Provides}));
+        foreach my $name (@provides) {
+            #die "conflicting provide: $name\n" if defined $provides{$name};
+            #warn "provide by $cdata->{Package} conflicts with package with the same name: $name\n";
+            next if defined $packages{$name};
+            $provides{$name} = $cdata->{Package};
+        }
+    }
+    # Treat "Replaces" like "Provides".
+    if (defined $cdata->{Replaces}) {
+        my @replaces = getDeps(Dpkg::Deps::deps_parse($cdata->{Replaces}));
+        foreach my $name (@replaces) {
+            next if defined $packages{$name};
+            $provides{$name} = $cdata->{Package};
+        }
     }
 }
 
diff --git a/pkgs/build-support/vm/default.nix b/pkgs/build-support/vm/default.nix
index 68ecb512901d..86b15ff91553 100644
--- a/pkgs/build-support/vm/default.nix
+++ b/pkgs/build-support/vm/default.nix
@@ -1422,6 +1422,28 @@ rec {
       packages = commonDebianPackages;
     };
 
+    debian70i386 = {
+      name = "debian-7.0.0-wheezy-i386";
+      fullName = "Debian 7.0.0 Wheezy (i386)";
+      packagesList = fetchurl {
+        url = mirror://debian/dists/wheezy/main/binary-i386/Packages.bz2;
+        sha256 = "712939639e2cc82615c85bdf81edf31edef0fda003ac2b32998e438aee403ab8";
+      };
+      urlPrefix = mirror://debian;
+      packages = commonDebianPackages;
+    };
+
+    debian70x86_64 = {
+      name = "debian-7.0.0-wheezy-amd64";
+      fullName = "Debian 7.0.0 Wheezy (amd64)";
+      packagesList = fetchurl {
+        url = mirror://debian/dists/wheezy/main/binary-amd64/Packages.bz2;
+        sha256 = "e79132f7db6655013be1f75feb9812b071386525246d8639679b322487d2732a";
+      };
+      urlPrefix = mirror://debian;
+      packages = commonDebianPackages;
+    };
+
   };
 
 
@@ -1485,6 +1507,7 @@ rec {
     "bzip2"
     "tar"
     "grep"
+    "sed"
     "findutils"
     "g++"
     "make"