diff --git a/libc/dce.h b/libc/dce.h
index 5b9f7e0fb..f67cb0028 100644
--- a/libc/dce.h
+++ b/libc/dce.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_DCE_H_
 #define COSMOPOLITAN_LIBC_DCE_H_
-#ifdef _COSMO_SOURCE
 /*─────────────────────────────────────────────────────────────────────────────╗
 │ cosmopolitan § autotune » dead code elimination                              │
 ╚─────────────────────────────────────────────────────────────────────────────*/
@@ -125,5 +125,5 @@ int IsQemuUser(void);
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_DCE_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/dlopen/dlfcn.h b/libc/dlopen/dlfcn.h
index 57eecd2f8..0d879dc3e 100644
--- a/libc/dlopen/dlfcn.h
+++ b/libc/dlopen/dlfcn.h
@@ -16,13 +16,11 @@ void *dlopen(const char *, int) libcesque;
 void *dlsym(void *, const char *) libcesque;
 int dlclose(void *) libcesque;
 
-#ifdef _COSMO_SOURCE
 char *cosmo_dlerror(void) libcesque;
 void *cosmo_dlopen(const char *, int) libcesque;
 void *cosmo_dlsym(void *, const char *) libcesque;
 void *cosmo_dltramp(void *) libcesque;
 int cosmo_dlclose(void *) libcesque;
-#endif
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_LIBC_DLFCN_H_ */
diff --git a/libc/fmt/itoa.h b/libc/fmt/itoa.h
index 0ed808f07..258c90e0b 100644
--- a/libc/fmt/itoa.h
+++ b/libc/fmt/itoa.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_FMT_ITOA_H_
 #define COSMOPOLITAN_LIBC_FMT_ITOA_H_
-#ifdef _COSMO_SOURCE
 COSMOPOLITAN_C_START_
 
 #define LengthInt64           __LengthInt64
@@ -42,5 +42,5 @@ libcesque size_t uint64toarray_fixed16(uint64_t, char[hasatleast 17], uint8_t);
 libcesque size_t uint64toarray_radix8(uint64_t, char[hasatleast 24]);
 
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_FMT_ITOA_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/fmt/leb128.h b/libc/fmt/leb128.h
index 8da59b5d3..beef341f9 100644
--- a/libc/fmt/leb128.h
+++ b/libc/fmt/leb128.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_FMT_LEB128_H_
 #define COSMOPOLITAN_LIBC_FMT_LEB128_H_
-#ifdef _COSMO_SOURCE
 COSMOPOLITAN_C_START_
 
 #define sleb64   __sleb64
@@ -16,5 +16,5 @@ int unzleb64(const char *, size_t, int64_t *) libcesque;
 int unuleb64(const char *, size_t, uint64_t *) libcesque;
 
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_FMT_LEB128_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/intrin/dll.h b/libc/intrin/dll.h
index eb1ce8b74..65b701471 100644
--- a/libc/intrin/dll.h
+++ b/libc/intrin/dll.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_INTRIN_DLL_H_
 #define COSMOPOLITAN_LIBC_INTRIN_DLL_H_
-#ifdef _COSMO_SOURCE
 #define dll_make_first   __dll_make_first
 #define dll_make_last    __dll_make_last
 #define dll_remove       __dll_remove
@@ -55,5 +55,5 @@ void dll_make_first(struct Dll **, struct Dll *) paramsnonnull((1)) libcesque;
 void dll_splice_after(struct Dll *, struct Dll *) paramsnonnull((1)) libcesque;
 
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_INTRIN_DLL_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/intrin/kprintf.h b/libc/intrin/kprintf.h
index d11508a68..ea654acb2 100644
--- a/libc/intrin/kprintf.h
+++ b/libc/intrin/kprintf.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_INTRIN_KPRINTF_H_
 #define COSMOPOLITAN_LIBC_INTRIN_KPRINTF_H_
-#ifdef _COSMO_SOURCE
 
 #define klog         __klog
 #define kprintf      __kprintf
@@ -54,5 +54,5 @@ void uvprintf(const char *, va_list) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_INTRIN_KPRINTF_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/log/log.h b/libc/log/log.h
index dbe66134f..8e88377e2 100644
--- a/libc/log/log.h
+++ b/libc/log/log.h
@@ -1,7 +1,7 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_LOG_LOG_H_
 #define COSMOPOLITAN_LIBC_LOG_LOG_H_
 #include "libc/stdio/stdio.h"
-#ifdef _COSMO_SOURCE
 
 #define kLogFatal   0
 #define kLogError   1
@@ -224,5 +224,5 @@ void vffatalf(ARGS, va_list) asm("vflogf") ATTRV relegated wontreturn libcesque;
 
 #endif /* __STRICT_ANSI__ */
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_LOG_LOG_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/mem/gc.h b/libc/mem/gc.h
index 3ff3b17d9..263421c53 100644
--- a/libc/mem/gc.h
+++ b/libc/mem/gc.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_MEM_GC_H_
 #define COSMOPOLITAN_LIBC_MEM_GC_H_
-#ifdef _COSMO_SOURCE
 COSMOPOLITAN_C_START_
 
 libcesque void _gc_free(void *);
@@ -19,5 +19,5 @@ libcesque void gclongjmp(void *, int) wontreturn;
   })
 
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_MEM_GC_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/nexgen32e/stackframe.h b/libc/nexgen32e/stackframe.h
index 895a109bd..242758bb1 100644
--- a/libc/nexgen32e/stackframe.h
+++ b/libc/nexgen32e/stackframe.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_NEXGEN32E_STACKFRAME_H_
 #define COSMOPOLITAN_LIBC_NEXGEN32E_STACKFRAME_H_
-#ifdef _COSMO_SOURCE
 COSMOPOLITAN_C_START_
 
 struct StackFrame {
@@ -9,5 +9,5 @@ struct StackFrame {
 };
 
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_NEXGEN32E_STACKFRAME_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/runtime/stack.h b/libc/runtime/stack.h
index dd5270634..01522ad7c 100644
--- a/libc/runtime/stack.h
+++ b/libc/runtime/stack.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
 #define COSMOPOLITAN_LIBC_RUNTIME_STACK_H_
-#ifdef _COSMO_SOURCE
 
 /**
  * Returns preferred size and alignment of thread stack.
@@ -156,5 +156,5 @@ int FreeCosmoStack(void *) libcesque;
 
 COSMOPOLITAN_C_END_
 #endif /* GNU ELF */
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_RUNTIME_STACK_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/stdio/append.h b/libc/stdio/append.h
index fd248705d..4ff526a3a 100644
--- a/libc/stdio/append.h
+++ b/libc/stdio/append.h
@@ -1,6 +1,6 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_STDIO_APPEND_H_
 #define COSMOPOLITAN_LIBC_STDIO_APPEND_H_
-#ifdef _COSMO_SOURCE
 
 #define APPEND_COOKIE 21578
 
@@ -32,5 +32,5 @@ ssize_t kappendf(char **, const char *, ...) libcesque;
 ssize_t kvappendf(char **, const char *, va_list) libcesque;
 
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_STDIO_APPEND_H_ */
+#endif /* _COSMO_SOURCE */
diff --git a/libc/x/x.h b/libc/x/x.h
index 39335fc91..dca4b877a 100644
--- a/libc/x/x.h
+++ b/libc/x/x.h
@@ -1,7 +1,7 @@
+#ifdef _COSMO_SOURCE
 #ifndef COSMOPOLITAN_LIBC_X_H_
 #define COSMOPOLITAN_LIBC_X_H_
 
-#ifdef _COSMO_SOURCE
 #define xwrite        __xwrite
 #define xdie          __xdie
 #define xmalloc       __xmalloc
@@ -32,9 +32,7 @@
 #define xfixpath      __xfixpath
 #define xslurp        __xslurp
 #define xbarf         __xbarf
-#endif /* _COSMO_SOURCE */
 
-#ifdef _COSMO_SOURCE
 COSMOPOLITAN_C_START_
 
 int xwrite(int, const void *, uint64_t);
@@ -97,5 +95,5 @@ void *xslurp(const char *, size_t *)
 int xbarf(const char *, const void *, size_t);
 
 COSMOPOLITAN_C_END_
-#endif /* _COSMO_SOURCE */
 #endif /* COSMOPOLITAN_LIBC_X_H_ */
+#endif /* _COSMO_SOURCE */