diff --git a/libc/include/features.h b/libc/include/features.h
index 8159a280..7c0907b7 100644
--- a/libc/include/features.h
+++ b/libc/include/features.h
@@ -125,7 +125,4 @@
 
 #define __pure2 __attribute__((__const__))
 
-/* Don't provide things from standard headers that is not implemented. */
-/*#define __SORTIX_SHOW_UNIMPLEMENTED*/
-
 #endif
diff --git a/libc/include/stdio.h b/libc/include/stdio.h
index 5a9aa1c5..78acf9e6 100644
--- a/libc/include/stdio.h
+++ b/libc/include/stdio.h
@@ -134,7 +134,7 @@ int vsprintf(char* __restrict s, const char* __restrict format, __gnuc_va_list a
 int vsscanf(const char* __restrict s, const char* __restrict format, __gnuc_va_list arg);
 
 /* TODO: These are not implemented in sortix libc yet. */
-#if defined(__SORTIX_SHOW_UNIMPLEMENTED)
+#if 0
 char* ctermid(char* s);
 FILE *fmemopen(void* __restrict buf, size_t size, const char* __restrict mode);
 FILE* open_memstream(char** bufp, size_t* sizep);
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index bfe50fa5..01bf7837 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -129,7 +129,7 @@ int clearenv(void);
 #endif
 
 /* TODO: These are not implemented in sortix libc yet. */
-#if defined(__SORTIX_SHOW_UNIMPLEMENTED)
+#if 0
 long a64l(const char* s);
 double drand48(void);
 double erand48(unsigned short [3]);
diff --git a/libc/include/sys/wait.h b/libc/include/sys/wait.h
index 982dc315..c7770878 100644
--- a/libc/include/sys/wait.h
+++ b/libc/include/sys/wait.h
@@ -38,7 +38,7 @@ __BEGIN_DECLS
 @include(pid_t.h)
 
 /* TODO: These are not implemented in sortix libc yet. */
-#if defined(__SORTIX_SHOW_UNIMPLEMENTED)
+#if 0
 int waitid(idtype_t, id_t, siginfo_t*, int);
 #endif
 
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index d2cf8267..692ef19d 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -265,7 +265,7 @@ extern char** environ;
 #endif
 
 /* TODO: These are not implemented in sortix libc yet. */
-#if defined(__SORTIX_SHOW_UNIMPLEMENTED)
+#if 0
 char* crypt(const char*, const char*);
 char* ctermid(char*);
 void encrypt(char [64], int);
diff --git a/libc/include/wchar.h b/libc/include/wchar.h
index 4fab5a1c..c345ba2d 100644
--- a/libc/include/wchar.h
+++ b/libc/include/wchar.h
@@ -92,7 +92,7 @@ wchar_t* wmemmove(wchar_t*, const wchar_t*, size_t);
 wchar_t* wmemset(wchar_t*, wchar_t, size_t);
 
 /* TODO: These are not implemented in sortix libc yet. */
-#if defined(__SORTIX_SHOW_UNIMPLEMENTED)
+#if 0
 double wcstod(const wchar_t* __restrict, wchar_t** __restrict);
 FILE* open_wmemstream(wchar_t** bufp, size_t* sizep);
 float wcstof(const wchar_t* __restrict, wchar_t** __restrict);
diff --git a/libc/include/wctype.h b/libc/include/wctype.h
index ec9277dc..15dfe125 100644
--- a/libc/include/wctype.h
+++ b/libc/include/wctype.h
@@ -55,7 +55,7 @@ wint_t towupper(wint_t);
 wctype_t wctype(const char *);
 
 /* TODO: These are not implemented in sortix libc yet. */
-#if defined(__SORTIX_SHOW_UNIMPLEMENTED)
+#if 0
 int iswalnum_l(wint_t, locale_t);
 int iswalpha_l(wint_t, locale_t);
 int iswblank_l(wint_t, locale_t);