diff --git a/libc/Makefile b/libc/Makefile
index f6112f1e..f85516f2 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -48,6 +48,7 @@ dirent/dunregister.o \
dirent/readdir.o \
dirent/rewinddir.o \
dirent/versionsort.o \
+dirent/versionsort_r.o \
errno/errno.o \
fnmatch/fnmatch.o \
inttypes/imaxabs.o \
diff --git a/libc/dirent/versionsort_r.cpp b/libc/dirent/versionsort_r.cpp
new file mode 100644
index 00000000..d1a17532
--- /dev/null
+++ b/libc/dirent/versionsort_r.cpp
@@ -0,0 +1,30 @@
+/*******************************************************************************
+
+ Copyright(C) Jonas 'Sortie' Termansen 2014.
+
+ This file is part of the Sortix C Library.
+
+ The Sortix C Library is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or (at your
+ option) any later version.
+
+ The Sortix C Library is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with the Sortix C Library. If not, see .
+
+ dirent/versionsort_r.cpp
+ Compare directory entries using strverscmp.
+
+*******************************************************************************/
+
+#include
+
+extern "C" int versionsort_r(const struct dirent** a, const struct dirent** b, void*)
+{
+ return versionsort(a, b);
+}
diff --git a/libc/include/dirent.h b/libc/include/dirent.h
index 0ba4d30f..ece25d1e 100644
--- a/libc/include/dirent.h
+++ b/libc/include/dirent.h
@@ -105,6 +105,7 @@ int scandir(const char*, struct dirent***, int (*)(const struct dirent*),
/* TODO: seekdir */
/* TODO: telldir */
int versionsort(const struct dirent**, const struct dirent**);
+int versionsort_r(const struct dirent**, const struct dirent**, void*);
#if defined(_SORTIX_SOURCE)
void dregister(DIR* dir);