diff --git a/lang/m2/comp/build.lua b/lang/m2/comp/build.lua
index 0bb27c5d1..1de3a4348 100644
--- a/lang/m2/comp/build.lua
+++ b/lang/m2/comp/build.lua
@@ -52,7 +52,6 @@ for _, f in ipairs(filenamesof(xh_files)) do
 		outleaves = { name..".h" },
 		commands = {
 			"%{ins[1]} < %{ins[2]} > %{outs}",
-			"cat %{outs}",
 		}
 	}
 end
diff --git a/util/cmisc/ed.c b/util/cmisc/ed.c
index c916aa962..e88ef0ec4 100644
--- a/util/cmisc/ed.c
+++ b/util/cmisc/ed.c
@@ -981,7 +981,7 @@ char *fname;
   nonascii = nullchar = truncated = 0;
 
   if (diag) printf("\"%s\" ", fname);
-  if ((fp = fopen(fname, "r")) == NULL) {
+  if ((fp = fopen(fname, "rb")) == NULL) {
 	printf("file open err\n");
 	return(ERR);
   }
@@ -1028,7 +1028,7 @@ int apflg;
 
   lines = bytes = 0;
   if (diag) printf("\"%s\" ", fname);
-  if ((fp = fopen(fname, (apflg ? "a" : "w"))) == NULL) {
+  if ((fp = fopen(fname, (apflg ? "ab" : "wb"))) == NULL) {
 	printf("file open error\n");
 	return(ERR);
   }