diff --git a/Makefile b/Makefile
index 534291f3..274fe19d 100644
--- a/Makefile
+++ b/Makefile
@@ -60,8 +60,9 @@
 #
 #   build/config.mk
 
-SHELL  = /bin/sh
-HOSTS ?= freebsd openbsd alpine
+SHELL   = /bin/sh
+HOSTS  ?= freebsd openbsd alpine
+SANITY := $(shell build/sanitycheck $$PPID)
 
 .SUFFIXES:
 .DELETE_ON_ERROR:
diff --git a/build/actuallynice b/build/actuallynice
index e68dcc2d..e03739e3 100755
--- a/build/actuallynice
+++ b/build/actuallynice
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/archive b/build/archive
index 1ba83e1d..a72c39c4 100755
--- a/build/archive
+++ b/build/archive
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/assemble b/build/assemble
index 27e92a3b..802147ef 100755
--- a/build/assemble
+++ b/build/assemble
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/bochs-debugger b/build/bochs-debugger
index 37c11d8f..9a3097a6 100755
--- a/build/bochs-debugger
+++ b/build/bochs-debugger
@@ -1,3 +1,4 @@
+#!/bin/sh
 # -*- mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8 -*-
 # vi: set net ft=sh ts=2 sts=2 sw=2 fenc=utf-8              :vi
 
diff --git a/build/catcode b/build/catcode
index e957f841..b3364e6d 100755
--- a/build/catcode
+++ b/build/catcode
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/compile b/build/compile
index 6989f225..521cc5a8 100755
--- a/build/compile
+++ b/build/compile
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/do b/build/do
index 36d4745d..e6b39f29 100755
--- a/build/do
+++ b/build/do
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/getccname b/build/getccname
index 83f6210e..2d9fb168 100755
--- a/build/getccname
+++ b/build/getccname
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/getccversion b/build/getccversion
index 0024e3db..ed74ba39 100755
--- a/build/getccversion
+++ b/build/getccversion
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/getlogfmt b/build/getlogfmt
index d168d42b..87a828ad 100755
--- a/build/getlogfmt
+++ b/build/getlogfmt
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/htags b/build/htags
index d8266fa1..6ce02de7 100755
--- a/build/htags
+++ b/build/htags
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/includeall b/build/includeall
index c9882a7e..bd714261 100755
--- a/build/includeall
+++ b/build/includeall
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 
diff --git a/build/link b/build/link
index 42e50cb9..7439197c 100755
--- a/build/link
+++ b/build/link
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/mkdeps b/build/mkdeps
index 28be7065..b6919ca4 100755
--- a/build/mkdeps
+++ b/build/mkdeps
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 
diff --git a/build/objdump b/build/objdump
index 7fca2eab..c1443828 100755
--- a/build/objdump
+++ b/build/objdump
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/package b/build/package
index 082ac816..41fa5fbb 100755
--- a/build/package
+++ b/build/package
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 
diff --git a/build/rollup b/build/rollup
index c9882a7e..bd714261 100755
--- a/build/rollup
+++ b/build/rollup
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 
diff --git a/build/runcom b/build/runcom
index 71ea44ff..d3268efb 100755
--- a/build/runcom
+++ b/build/runcom
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 
diff --git a/build/sanitycheck b/build/sanitycheck
new file mode 100755
index 00000000..c2da2d26
--- /dev/null
+++ b/build/sanitycheck
@@ -0,0 +1,57 @@
+#!/bin/sh
+#
+# OVERVIEW
+#
+#   System Sanity Check
+#
+# DESCRIPTION
+#
+#   This script is launched at the start of Makefile to detect if
+#   binfmt_misc was tuned to launch 'MZ' shell scripts under WINE
+
+if [ x`uname -s` != xLinux ]; then
+  cat <<'EOF' >&2
+
+ERROR
+
+  Want Linux Build Environment
+
+DETAILS
+
+  Cosmopolitan builds binaries that run on all major platforms.
+  You need to compile them on Linux, using any distro you like.
+  Consider setting up Alpine, Debian, or Ubuntu in a VMWare VM.
+
+EOF
+  kill $1
+  exit 1
+fi
+
+build/sanitycheck2
+if [ $? -ne 123 ]; then
+  cat <<'EOF' >&2
+
+ERROR
+
+  Thompson Shell Backwards Compatibility Issue Detected
+
+DETAILS
+
+  Actually Portable Executable assumes stock Linux configuration.
+  Normal behavior is non-ELF files with x bit are run by /bin/sh.
+  Linux lets people globally define arbitrary magic interpreters.
+  Your computer couldve been tuned to run MZ scripts inside WINE.
+  So if you use binfmt_misc you need to explicitly register this.
+
+WORKAROUND
+
+  sudo sh -c "echo ':APE:M::MZqFpD::/bin/sh:' >/proc/sys/fs/binfmt_misc/register"
+
+SEE ALSO
+
+  https://justine.storage.googleapis.com/ape.html
+
+EOF
+  kill $1
+  exit 1
+fi
diff --git a/build/sanitycheck2 b/build/sanitycheck2
new file mode 100755
index 00000000..4b1b3a53
--- /dev/null
+++ b/build/sanitycheck2
@@ -0,0 +1,9 @@
+PE=123
+exit $PE
+                                                                                
+                                                                                
+                                                                                
+                                                                                
+                                                                                
+                                                                                
+         
diff --git a/build/ssh b/build/ssh
index 17a09fb6..81c14c80 100755
--- a/build/ssh
+++ b/build/ssh
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 #
diff --git a/build/zipobj b/build/zipobj
index f2f61f27..dfa1a89a 100755
--- a/build/zipobj
+++ b/build/zipobj
@@ -1,3 +1,4 @@
+#!/bin/sh
 #-*-mode:sh;indent-tabs-mode:nil;tab-width:2;coding:utf-8-*-┐
 #───vi: set net ft=sh ts=2 sts=2 fenc=utf-8 :vi─────────────┘
 
diff --git a/tool/decode/pe2.c b/tool/decode/pe2.c
index 99c614c1..3d490475 100644
--- a/tool/decode/pe2.c
+++ b/tool/decode/pe2.c
@@ -110,21 +110,6 @@ static void showmzheader(void) {
 }
 
 static void showdosstub(void) {
-  unsigned char *p = (unsigned char *)mz + sizeof(struct NtImageDosHeader);
-  unsigned char *pe = (mz->e_lfanew ? p + mz->e_lfanew : p + mzsize);
-  pe = min(pe, p + mzsize - XED_MAX_INSTRUCTION_BYTES);
-  while (p < pe) {
-    struct XedDecodedInst *inst = ildreal(p);
-    if (p + inst->length > pe) break;
-    printf("\t.byte\t");
-    for (unsigned i = 0; i < inst->length; ++i) {
-      if (i) printf(",");
-      printf("%#hhx", inst->bytes[i]);
-    }
-    printf("\n");
-    p += inst->length;
-  }
-  printf("\n");
 }
 
 static void showpeoptionalheader(struct NtImageOptionalHeader *opt) {