Prevent document corruption when including nested EPS files.
Index: presentps
--- presentps.orig
+++ presentps
@@ -453,8 +453,18 @@ foreach (@pre){
 while (<>) {
     $pageln = $nextln;
     @page = ();
+    my $embedded = 0;
     while (<>) {
-	if (/^EEND /) {
+	if (/^%%BeginDocument:/) {
+	    # prevent processing of included document
+	    $embedded++;
+	    push @page, $_;
+	} elsif ($embedded) {
+	    if (/^%%EndDocument/) {
+		$embedded--;
+	    }
+	    push @page, $_;
+	} elsif (/^EEND /) {
 	    push @page, "EEND\n";
 	    s/^EEND //;
 	    redo;
@@ -476,15 +486,6 @@ while (<>) {
 	    s/ EP$//;
 	    push @page, $_;
 	    push @page, "EP\n";
-	} elsif (/^%%BeginDocument:/) {
-	    # prevent processing of included document
-	    push @page, $_;
-	    while (<>) {
-		push @page, $_;
-		if (/^%%EndDocument$/) {
-		    last;
-		}
-	    }
 	} elsif (/^%%Trailer$/) {
 	    $lastpage = 1;
 	    $nextln = $_;