diff --git a/Makefile b/Makefile
index 573025981..7532efa60 100644
--- a/Makefile
+++ b/Makefile
@@ -88,7 +88,8 @@ o/$(MODE):			\
 
 ifneq ($(LANDLOCKMAKE_VERSION),)
 ifeq ($(wildcard /usr/bin/ape),)
-$(error please run ape/apeinstall.sh if you intend to use landlock make)
+$(warning please run ape/apeinstall.sh if you intend to use landlock make)
+$(shell sleep .5)
 endif
 ifeq ($(USE_SYSTEM_TOOLCHAIN),)
 .STRICT = 1
diff --git a/build/rules.mk b/build/rules.mk
index 55328fc01..0dd60984d 100644
--- a/build/rules.mk
+++ b/build/rules.mk
@@ -247,7 +247,7 @@ o/$(MODE)/%-clang.asm: %.c
 	@$(COMPILE) -AOBJECTIFY.c $(OBJECTIFY.c) -S -g0 $(OUTPUT_OPTION) $<
 
 # TODO(jart): Make intrinsics support Clang.
-# o/$(MODE)/%-clang.asm: CC = $(CLANG)
+o/$(MODE)/%-clang.asm: CC = $(CLANG)
 o/$(MODE)/%-clang.asm: private .UNSANDBOXED = 1
 o/$(MODE)/%-clang.asm: %.cc
 	@$(COMPILE) -AOBJECTIFY.c $(OBJECTIFY.cxx) -S -g0 $(OUTPUT_OPTION) $<
diff --git a/libc/calls/wincrash.c b/libc/calls/wincrash.c
index 05c3f4c2d..49f9edb7b 100644
--- a/libc/calls/wincrash.c
+++ b/libc/calls/wincrash.c
@@ -44,20 +44,20 @@ unsigned __wincrash(struct NtExceptionPointers *ep) {
   static bool noreentry;
   noreentry = true;
 
+  STRACE("wincrash rip %x bt %s", ep->ContextRecord->Rip,
+         DescribeBacktrace((struct StackFrame *)ep->ContextRecord->Rbp));
+
   if ((tib = __tls_enabled ? __get_tls_privileged() : 0)) {
     if (~tib->tib_flags & TIB_FLAG_WINCRASHING) {
       tib->tib_flags |= TIB_FLAG_WINCRASHING;
     } else {
-    WincrashPanic:
-      STRACE("panic: wincrash reentry: rip %x bt %s", ep->ContextRecord->Rip,
-             DescribeBacktrace((struct StackFrame *)ep->ContextRecord->Rbp));
       ExitProcess(89);
     }
   } else {
     if (!noreentry) {
       noreentry = true;
     } else {
-      goto WincrashPanic;
+      ExitProcess(89);
     }
   }
 
diff --git a/libc/runtime/printargs.c b/libc/runtime/printargs.c
index d54fde198..4a0642fdf 100644
--- a/libc/runtime/printargs.c
+++ b/libc/runtime/printargs.c
@@ -104,7 +104,7 @@ static dontasan void Print(const char *prologue) {
  *
  * @param prologue needs to be a .rodata kprintf string
  */
-textstartup void __printargs(const char *prologue) {
+dontasan textstartup void __printargs(const char *prologue) {
 
   const struct AuxiliaryValue {
     const char *fmt;
diff --git a/libc/runtime/winmain.greg.c b/libc/runtime/winmain.greg.c
index e55ccb736..4247236e3 100644
--- a/libc/runtime/winmain.greg.c
+++ b/libc/runtime/winmain.greg.c
@@ -20,6 +20,7 @@
 #include "libc/calls/syscall_support-nt.internal.h"
 #include "libc/dce.h"
 #include "libc/intrin/describeflags.internal.h"
+#include "libc/intrin/kprintf.h"
 #include "libc/intrin/strace.internal.h"
 #include "libc/intrin/weaken.h"
 #include "libc/log/libfatal.internal.h"
@@ -29,6 +30,7 @@
 #include "libc/nt/enum/consolemodeflags.h"
 #include "libc/nt/enum/filemapflags.h"
 #include "libc/nt/enum/pageflags.h"
+#include "libc/nt/files.h"
 #include "libc/nt/memory.h"
 #include "libc/nt/pedef.internal.h"
 #include "libc/nt/process.h"
@@ -123,6 +125,18 @@ __msabi static textwindows int OnEarlyWinCrash(struct NtExceptionPointers *ep) {
   ExitProcess(200);
 }
 
+__msabi static textwindows void DeduplicateStdioHandles(void) {
+  int64_t proc, outhand, errhand, newhand;
+  outhand = GetStdHandle(kNtStdOutputHandle);
+  errhand = GetStdHandle(kNtStdErrorHandle);
+  if (outhand == errhand) {
+    proc = GetCurrentProcess();
+    DuplicateHandle(proc, errhand, proc, &newhand, 0, true,
+                    kNtDuplicateSameAccess);
+    SetStdHandle(kNtStdErrorHandle, newhand);
+  }
+}
+
 __msabi static textwindows wontreturn void WinMainNew(const char16_t *cmdline) {
   bool32 rc;
   int64_t h, hand;
@@ -136,6 +150,7 @@ __msabi static textwindows wontreturn void WinMainNew(const char16_t *cmdline) {
   intptr_t stackaddr, allocaddr;
   version = NtGetPeb()->OSMajorVersion;
   __oldstack = (intptr_t)__builtin_frame_address(0);
+  DeduplicateStdioHandles();
   if ((intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui && version >= 10) {
     rc = SetConsoleCP(kNtCpUtf8);
     NTTRACE("SetConsoleCP(kNtCpUtf8) → %hhhd", rc);
diff --git a/test/libc/calls/close_test.c b/test/libc/calls/close_test.c
new file mode 100644
index 000000000..1556b7828
--- /dev/null
+++ b/test/libc/calls/close_test.c
@@ -0,0 +1,28 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2023 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/calls/calls.h"
+#include "libc/dce.h"
+#include "libc/stdio/stdio.h"
+#include "libc/testlib/testlib.h"
+
+TEST(close, stdout) {
+  if (!IsWindows()) return;
+  close(1);
+  fprintf(stderr, "hi\n");
+}