diff --git a/libc/build.mak b/libc/build.mak
index 5bcebbfb8d366a0f170fd855a00598c3b22eb6e2..30eef3c0cc73cdc213fbbc1412c5564ccf75351a 100644
--- a/libc/build.mak
+++ b/libc/build.mak
@@ -1,5 +1,6 @@
 libc = string/strcmp.o
 libc += string/strcpy.o
+libc += string/strncmp.o
 libc += string.o
 libc += printf.o
 libc += pthread.o
diff --git a/libc/string.cc b/libc/string.cc
index e55fb5470efae27c699240bdcf4a7cd6ebf21e8e..5e49200d227d063124a1b55ec8bc1b96c6c49f6f 100644
--- a/libc/string.cc
+++ b/libc/string.cc
@@ -57,16 +57,3 @@ char* strdup(const char *s)
     auto p = static_cast<char*>(malloc(strlen(s)+1));
     return strcpy(p, s);
 }
-
-int strncmp(const char *s1, const char *s2, size_t n)
-{
-    while (n && *s1 && *s2 && tolower(*s1) == tolower(*s2)) {
-        ++s1;
-        ++s2;
-        --n;
-    }
-    if (n == 0) {
-        return 0;
-    }
-    return int(tolower(*s2)) - int(tolower(*s1));
-}
diff --git a/libc/string/strncmp.c b/libc/string/strncmp.c
new file mode 100755
index 0000000000000000000000000000000000000000..6281ace17fef5c63ffe2c5c64806e46fd4d1a81e
--- /dev/null
+++ b/libc/string/strncmp.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include <string.h>
+
+int
+strncmp(s1, s2, n)
+	const char *s1, *s2;
+	size_t n;
+{
+
+	if (n == 0)
+		return (0);
+	do {
+		if (*s1 != *s2++)
+			return (*(unsigned char *)s1 - *(unsigned char *)--s2);
+		if (*s1++ == 0)
+			break;
+	} while (--n != 0);
+	return (0);
+}
diff --git a/licenses/ucb.txt b/licenses/ucb.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d3e3021cee6f18ecc4b2dac6215eb5eb52daa5fa
--- /dev/null
+++ b/licenses/ucb.txt
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */