diff --git a/libc/Android.mk b/libc/Android.mk
index d044145..916b63c 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -290,6 +290,7 @@
     upstream-netbsd/lib/libc/stdlib/drand48.c \
     upstream-netbsd/lib/libc/stdlib/erand48.c \
     upstream-netbsd/lib/libc/stdlib/jrand48.c \
+    upstream-netbsd/lib/libc/stdlib/lcong48.c \
     upstream-netbsd/lib/libc/stdlib/ldiv.c \
     upstream-netbsd/lib/libc/stdlib/lldiv.c \
     upstream-netbsd/lib/libc/stdlib/lrand48.c \
diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index b97eaf9..3053e85 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -103,15 +103,6 @@
 
 extern void qsort(void *, size_t, size_t, int (*)(const void *, const void *));
 
-extern long jrand48(unsigned short *);
-extern long mrand48(void);
-extern long nrand48(unsigned short *);
-extern long lrand48(void);
-extern unsigned short *seed48(unsigned short*);
-extern double erand48(unsigned short xsubi[3]);
-extern double drand48(void);
-extern void srand48(long);
-
 uint32_t arc4random(void);
 uint32_t arc4random_uniform(uint32_t);
 void arc4random_buf(void*, size_t);
@@ -122,6 +113,16 @@
 int rand_r(unsigned int*);
 void srand(unsigned int);
 
+double drand48(void);
+double erand48(unsigned short[3]);
+long jrand48(unsigned short[3]);
+void lcong48(unsigned short[7]);
+long lrand48(void);
+long mrand48(void);
+long nrand48(unsigned short[3]);
+unsigned short* seed48(unsigned short[3]);
+void srand48(long);
+
 char* initstate(unsigned int, char*, size_t);
 long random(void);
 char* setstate(char*);
diff --git a/libc/upstream-netbsd/lib/libc/stdlib/lcong48.c b/libc/upstream-netbsd/lib/libc/stdlib/lcong48.c
new file mode 100644
index 0000000..42ce979
--- /dev/null
+++ b/libc/upstream-netbsd/lib/libc/stdlib/lcong48.c
@@ -0,0 +1,43 @@
+/*	$NetBSD: lcong48.c,v 1.8 2005/06/12 05:21:28 lukem Exp $	*/
+
+/*
+ * Copyright (c) 1993 Martin Birgmeier
+ * All rights reserved.
+ *
+ * You may redistribute unmodified or modified versions of this source
+ * code provided that the above copyright notice and this and the
+ * following conditions are retained.
+ *
+ * This software is provided ``as is'', and comes with no warranties
+ * of any kind. I shall in no event be liable for anything that happens
+ * to anyone/anything when using this software.
+ */
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: lcong48.c,v 1.8 2005/06/12 05:21:28 lukem Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#include "namespace.h"
+
+#include <assert.h>
+
+#include "rand48.h"
+
+#ifdef __weak_alias
+__weak_alias(lcong48,_lcong48)
+#endif
+
+void
+lcong48(unsigned short p[7])
+{
+	_DIAGASSERT(p != NULL);
+
+	__rand48_seed[0] = p[0];
+	__rand48_seed[1] = p[1];
+	__rand48_seed[2] = p[2];
+	__rand48_mult[0] = p[3];
+	__rand48_mult[1] = p[4];
+	__rand48_mult[2] = p[5];
+	__rand48_add = p[6];
+}