diff --git a/src/libraries/libc/arch/amd64/errno.cpp b/src/libraries/libc/arch/amd64/errno.cpp
new file mode 100644
index 0000000..8afd4f6
--- /dev/null
+++ b/src/libraries/libc/arch/amd64/errno.cpp
@@ -0,0 +1,10 @@
+#include <arch/amd64/errno.h>
+
+static int errno_value = 0;
+
+int *
+__errno_location()
+{
+    // TODO: thread-local errno
+    return &errno_value;
+}
diff --git a/src/libraries/libc/include/arch/amd64/errno.h b/src/libraries/libc/include/arch/amd64/errno.h
index a4c7eb6..10e8d66 100644
--- a/src/libraries/libc/include/arch/amd64/errno.h
+++ b/src/libraries/libc/include/arch/amd64/errno.h
@@ -2,4 +2,13 @@
 /// \file arch/amd64/errno.h
 /// errno implementation for amd64
 
-extern int errno;
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int * __errno_location();
+#define errno (*__errno_location())
+
+#ifdef __cplusplus
+} // extern C
+#endif
diff --git a/src/libraries/libc/stdlib/strtod.cpp b/src/libraries/libc/stdlib/strtod.cpp
new file mode 100644
index 0000000..916a37f
--- /dev/null
+++ b/src/libraries/libc/stdlib/strtod.cpp
@@ -0,0 +1,18 @@
+/** \file strtod.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <stdlib.h>
+
+double strtod( const char * restrict nptr, char ** restrict endptr )
+{
+    assert(!"strtod() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/stdlib/strtof.cpp b/src/libraries/libc/stdlib/strtof.cpp
new file mode 100644
index 0000000..913b365
--- /dev/null
+++ b/src/libraries/libc/stdlib/strtof.cpp
@@ -0,0 +1,18 @@
+/** \file strtof.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <stdlib.h>
+
+float strtof( const char * restrict nptr, char ** restrict endptr )
+{
+    assert(!"strtof() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/stdlib/strtol.cpp b/src/libraries/libc/stdlib/strtol.cpp
new file mode 100644
index 0000000..b30c8c7
--- /dev/null
+++ b/src/libraries/libc/stdlib/strtol.cpp
@@ -0,0 +1,18 @@
+/** \file strtol.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <stdlib.h>
+
+long strtol( const char * restrict nptr, char ** restrict endptr, int base )
+{
+    assert(!"strtol() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/stdlib/strtold.cpp b/src/libraries/libc/stdlib/strtold.cpp
new file mode 100644
index 0000000..1d9aff1
--- /dev/null
+++ b/src/libraries/libc/stdlib/strtold.cpp
@@ -0,0 +1,18 @@
+/** \file strtold.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <stdlib.h>
+
+long double strtold( const char * restrict nptr, char ** restrict endptr )
+{
+    assert(!"strtold() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/stdlib/strtoll.cpp b/src/libraries/libc/stdlib/strtoll.cpp
new file mode 100644
index 0000000..50dfc94
--- /dev/null
+++ b/src/libraries/libc/stdlib/strtoll.cpp
@@ -0,0 +1,18 @@
+/** \file strtoll.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <stdlib.h>
+
+long long strtoll( const char * restrict nptr, char ** restrict endptr, int base )
+{
+    assert(!"strtoll() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/stdlib/strtoul.cpp b/src/libraries/libc/stdlib/strtoul.cpp
new file mode 100644
index 0000000..2846ed1
--- /dev/null
+++ b/src/libraries/libc/stdlib/strtoul.cpp
@@ -0,0 +1,18 @@
+/** \file strtoul.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <stdlib.h>
+
+unsigned long strtoul( const char * restrict nptr, char ** restrict endptr, int base )
+{
+    assert(!"strtoul() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/stdlib/strtoull.cpp b/src/libraries/libc/stdlib/strtoull.cpp
new file mode 100644
index 0000000..6eeff9c
--- /dev/null
+++ b/src/libraries/libc/stdlib/strtoull.cpp
@@ -0,0 +1,18 @@
+/** \file strtoull.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <stdlib.h>
+
+unsigned long long strtoull( const char * restrict nptr, char ** restrict endptr, int base )
+{
+    assert(!"strtoull() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/string/memcmp.cpp b/src/libraries/libc/string/memcmp.cpp
index 5aa7f47..f7d0984 100644
--- a/src/libraries/libc/string/memcmp.cpp
+++ b/src/libraries/libc/string/memcmp.cpp
@@ -23,3 +23,5 @@ int memcmp(const void *s1, const void *s2, size_t n) {
     return -1;
 }
 
+extern "C" int bcmp(const void *s1, const void *s2, size_t n)
+    __attribute__ ((weak, alias ("memcmp")));
diff --git a/src/libraries/libc/wchar/swprintf.cpp b/src/libraries/libc/wchar/swprintf.cpp
new file mode 100644
index 0000000..6c89cbc
--- /dev/null
+++ b/src/libraries/libc/wchar/swprintf.cpp
@@ -0,0 +1,18 @@
+/** \file swprintf.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+int swprintf(wchar_t * restrict s, size_t n, const wchar_t * restrict format, ...)
+{
+    assert(!"swprintf() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcslen.cpp b/src/libraries/libc/wchar/wcslen.cpp
new file mode 100644
index 0000000..57e2c62
--- /dev/null
+++ b/src/libraries/libc/wchar/wcslen.cpp
@@ -0,0 +1,18 @@
+/** \file wcslen.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+size_t wcslen(const wchar_t * s)
+{
+    assert(!"wcslen() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcstod.cpp b/src/libraries/libc/wchar/wcstod.cpp
new file mode 100644
index 0000000..f21ef5a
--- /dev/null
+++ b/src/libraries/libc/wchar/wcstod.cpp
@@ -0,0 +1,18 @@
+/** \file wcstod.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+double wcstod(const wchar_t * restrict nptr, wchar_t ** restrict endptr)
+{
+    assert(!"wcstod() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcstof.cpp b/src/libraries/libc/wchar/wcstof.cpp
new file mode 100644
index 0000000..fc3fda4
--- /dev/null
+++ b/src/libraries/libc/wchar/wcstof.cpp
@@ -0,0 +1,18 @@
+/** \file wcstof.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+float wcstof(const wchar_t * restrict nptr, wchar_t ** restrict endptr)
+{
+    assert(!"wcstof() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcstol.cpp b/src/libraries/libc/wchar/wcstol.cpp
new file mode 100644
index 0000000..9aace21
--- /dev/null
+++ b/src/libraries/libc/wchar/wcstol.cpp
@@ -0,0 +1,18 @@
+/** \file wcstol.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+long wcstol(const wchar_t * restrict nptr, wchar_t ** restrict endptr, int base)
+{
+    assert(!"wcstol() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcstold.cpp b/src/libraries/libc/wchar/wcstold.cpp
new file mode 100644
index 0000000..787e24f
--- /dev/null
+++ b/src/libraries/libc/wchar/wcstold.cpp
@@ -0,0 +1,18 @@
+/** \file wcstold.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+long double wcstold(const wchar_t * restrict nptr, wchar_t ** restrict endptr)
+{
+    assert(!"wcstold() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcstoll.cpp b/src/libraries/libc/wchar/wcstoll.cpp
new file mode 100644
index 0000000..18167cc
--- /dev/null
+++ b/src/libraries/libc/wchar/wcstoll.cpp
@@ -0,0 +1,18 @@
+/** \file wcstoll.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+long long wcstoll(const wchar_t * restrict nptr, wchar_t ** restrict endptr, int base)
+{
+    assert(!"wcstoll() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcstoul.cpp b/src/libraries/libc/wchar/wcstoul.cpp
new file mode 100644
index 0000000..93b5d88
--- /dev/null
+++ b/src/libraries/libc/wchar/wcstoul.cpp
@@ -0,0 +1,18 @@
+/** \file wcstoul.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+unsigned long wcstoul(const wchar_t * restrict nptr, wchar_t ** restrict endptr, int base)
+{
+    assert(!"wcstoul() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wcstoull.cpp b/src/libraries/libc/wchar/wcstoull.cpp
new file mode 100644
index 0000000..a1c2b1d
--- /dev/null
+++ b/src/libraries/libc/wchar/wcstoull.cpp
@@ -0,0 +1,18 @@
+/** \file wcstoull.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+unsigned long long wcstoull(const wchar_t * restrict nptr, wchar_t ** restrict endptr, int base)
+{
+    assert(!"wcstoull() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wmemchr.cpp b/src/libraries/libc/wchar/wmemchr.cpp
new file mode 100644
index 0000000..f96f1d7
--- /dev/null
+++ b/src/libraries/libc/wchar/wmemchr.cpp
@@ -0,0 +1,18 @@
+/** \file wmemchr.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+wchar_t * wmemchr(const wchar_t * s, wchar_t c, size_t n)
+{
+    assert(!"wmemchr() NYI");
+    return 0;
+}
diff --git a/src/libraries/libc/wchar/wmememp.cpp b/src/libraries/libc/wchar/wmememp.cpp
new file mode 100644
index 0000000..0a3e706
--- /dev/null
+++ b/src/libraries/libc/wchar/wmememp.cpp
@@ -0,0 +1,18 @@
+/** \file wmemcmp.cpp
+  *
+  * This file is part of the C standard library for the jsix operating
+  * system.
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+  */
+
+#include <assert.h>
+#include <wchar.h>
+
+int wmemcmp(const wchar_t * s1, const wchar_t * s2, size_t n)
+{
+    assert(!"wmemcmp() NYI");
+    return 0;
+}