diff --git a/modules/src/string/ack_string.h b/modules/src/string/ack_string.h
index c43b19b56..56b646e4c 100644
--- a/modules/src/string/ack_string.h
+++ b/modules/src/string/ack_string.h
@@ -7,25 +7,16 @@
 #ifndef __ACK_STRING_INCLUDED__
 #define __ACK_STRING_INCLUDED__
 
-#include <ansi.h>
-
-_PROTOTYPE(char *strcpy, (char *s1, const char *s2));
-_PROTOTYPE(char *strncpy, (char *s1, const char *s2, size_t n));
-_PROTOTYPE(char *strcat, (char *s1, const char *s2));
-_PROTOTYPE(char *strncat, (char *s1, const char *s2, size_t n));
-_PROTOTYPE(int strcmp, (const char *s1, const char *s2));
-_PROTOTYPE(int strncmp, (const char *s1, const char *s2, size_t n));
-_PROTOTYPE(_SIZET strlen, (const char *s));
-_PROTOTYPE(char *strindex, (char *s, int c));
-_PROTOTYPE(char *strrindex, (char *s, int c));
-_PROTOTYPE(char *strzero, (char *s));
-_PROTOTYPE(char *str2bts, (char *s, char *b, int *n));
-_PROTOTYPE(char *long2str, (long l, int b));
-_PROTOTYPE(long str2long, (char *s, int b));
-_PROTOTYPE(char *btscpy, (char *s1, char *s2, int n));
-_PROTOTYPE(char *btscat, (char *s1, int n1, char *s2, int n2));
-_PROTOTYPE(int btscmp, (char *s1, int n1, char *s2, int n2));
-_PROTOTYPE(char *btszero, (char *b, int n));
-_PROTOTYPE(char *bts2str, (char *b, int n, char *s));
+char *strindex(char *s, int c);
+char *strrindex(char *s, int c);
+char *strzero(char *s);
+char *str2bts(char *s, char *b, int *n);
+char *long2str(long l, int b);
+long str2long(char *s, int b);
+char *btscpy(char *s1, char *s2, int n);
+char *btscat(char *s1, int n1, char *s2, int n2);
+int btscmp(char *s1, int n1, char *s2, int n2);
+char *btszero(char *b, int n);
+char *bts2str(char *b, int n, char *s);
 
 #endif /* __ACK_STRING_INCLUDED__ */
diff --git a/modules/src/string/build.lua b/modules/src/string/build.lua
index b2aa4b9c3..647a32146 100644
--- a/modules/src/string/build.lua
+++ b/modules/src/string/build.lua
@@ -1,10 +1,13 @@
 clibrary {
 	name = "lib",
-	srcs = { "./*.c" },
+	srcs = {
+		"./bts2str.c", "./btscat.c", "./btscmp.c",
+		"./btscpy.c", "./btszero.c", "./long2str.c",
+		"./str2bts.c", "./str2long.c", "./strindex.c",
+		"./strrindex.c", "./strzero.c",
+	},
 	deps = {
+		"./ack_string.h",
 		"modules+headers",
-		"./*.h"
 	},
 }
-
-
diff --git a/modules/src/string/strcat.c b/modules/src/string/strcat.c
deleted file mode 100644
index a1d3085b8..000000000
--- a/modules/src/string/strcat.c
+++ /dev/null
@@ -1,24 +0,0 @@
-/* $Id$ */
-/*
- * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
- * See the copyright notice in the ACK home directory, in the file "Copyright".
- */
-/* append t to s
-*/
-
-#include "ack_string.h"
-
-char *
-strcat(s, t)
-	register char *s;
-	register _CONST char *t;
-{
-	register char *b = s;
-
-	while (*s++)
-		;
-	s--;
-	while (*s++ = *t++)
-		;
-	return b;
-}
diff --git a/modules/src/string/strcmp.c b/modules/src/string/strcmp.c
deleted file mode 100644
index f6ba8bfa7..000000000
--- a/modules/src/string/strcmp.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/* $Id$ */
-/*
- * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
- * See the copyright notice in the ACK home directory, in the file "Copyright".
- */
-/*	return negative, zero or positive value if
-	resp. s < t, s == t or s > t
-*/
-
-#include "ack_string.h"
-
-int
-strcmp(s, t)
-	register _CONST char *s, *t;
-{
-	while (*s == *t++)
-		if (*s++ == '\0')
-			return 0;
-	return *s - *--t;
-}
diff --git a/modules/src/string/strcpy.c b/modules/src/string/strcpy.c
deleted file mode 100644
index 220cf9687..000000000
--- a/modules/src/string/strcpy.c
+++ /dev/null
@@ -1,21 +0,0 @@
-/* $Id$ */
-/*
- * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
- * See the copyright notice in the ACK home directory, in the file "Copyright".
- */
-/* Copy t into s
-*/
-
-#include "ack_string.h"
-
-char *
-strcpy(s, t)
-	register char *s;
-	register _CONST char *t;
-{
-	register char *b = s;
-
-	while (*s++ = *t++)
-		;
-	return b;
-}
diff --git a/modules/src/string/string.3 b/modules/src/string/string.3
index 22bfd71a9..8d1877a22 100644
--- a/modules/src/string/string.3
+++ b/modules/src/string/string.3
@@ -1,8 +1,7 @@
 .TH STRING 3 "$Revision$"
 .ad
 .SH NAME
-strcpy, strncpy, strcat, strncat, strcmp, strncmp,
-strlen, strindex, strrindex, strzero, str2bts,
+strindex, strrindex, strzero, str2bts,
 long2str, str2long,
 btscpy, btscat, btscmp, btszero, bts2str \- operations on and
 conversions between strings and row of bytes
@@ -10,27 +9,6 @@ conversions between strings and row of bytes
 .nf
 .B #include <ack_string.h>
 .PP
-.B char *strcpy(s1, s2)
-.B char *s1, *s2;
-.PP
-.B char *strncpy(s1, s2, n)
-.B char *s1, *s2;
-.PP
-.B char *strcat(s1, s2)
-.B char *s1, *s2;
-.PP
-.B char *strncat(s1, s2, n)
-.B char *s1, *s2;
-.PP
-.B int strcmp(s1, s2)
-.B char *s1, *s2;
-.PP
-.B int strncmp(s1, s2, n)
-.B char *s1, *s2;
-.PP
-.B int strlen(s)
-.B char *s;
-.PP
 .B char *strindex(s, c)
 .B char *s, c;
 .PP
@@ -82,56 +60,6 @@ functions operate on variable-length rows of bytes,
 regardless of null bytes.
 Neither of these functions check for overflow of any receiving area.
 .PP
-.I Strcpy
-copies string
-.I s2
-to
-.I s1,
-stopping after the null character has been moved.
-.I Strncpy
-copies exactly
-.I n
-characters,
-truncating or null-padding
-.I s2;
-the target may not be null-terminated if the length
-of
-.I s2
-is
-.I n
-or more.
-Both return
-.IR s1 .
-.PP
-.I Strcat
-appends a copy of string
-.I s2
-to the end of string
-.IR s1 .
-.I Strncat
-copies at most
-.I n
-characters.
-Both return a pointer to the null-terminated result
-.IR s1 .
-.PP
-.I Strcmp
-compares its arguments and returns an integer
-greater than, equal to, or less than 0, if
-.I s1
-is lexicographically greater than, equal to, or
-less than
-.IR s2 ,
-respectively.
-.I Strncmp
-makes the same comparison but checks at most
-.I n
-characters.
-.PP
-.I Strlen
-returns the number of characters before the null-character.
-.IR s .
-.PP
 .I Strindex
 .RI ( strrindex )
 returns a pointer to the first (last)
diff --git a/modules/src/string/strlen.c b/modules/src/string/strlen.c
deleted file mode 100644
index 8e429f261..000000000
--- a/modules/src/string/strlen.c
+++ /dev/null
@@ -1,20 +0,0 @@
-/* $Id$ */
-/*
- * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
- * See the copyright notice in the ACK home directory, in the file "Copyright".
- */
-/* return length of s
-*/
-
-#include "ack_string.h"
-
-_SIZET
-strlen(s)
-	_CONST char *s;
-{
-	register _CONST char *b = s;
-
-	while (*b++)
-		;
-	return b - s - 1;
-}
diff --git a/modules/src/string/strncat.c b/modules/src/string/strncat.c
deleted file mode 100644
index c6ecd31ed..000000000
--- a/modules/src/string/strncat.c
+++ /dev/null
@@ -1,25 +0,0 @@
-/* $Id$ */
-/*
- * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
- * See the copyright notice in the ACK home directory, in the file "Copyright".
- */
-/* append t to s, upto n characters	
-*/
-
-#include "ack_string.h"
-
-char *
-strncat(s, t, n)
-	register char *s;
-	register _CONST char *t;
-	register _SIZET n;
-{
-	register char *b = s;
-
-	while (*s++)
-		;
-	s--;
-	while ((n-- > 0) && (*s++ = *t++))
-		;
-	return b;
-}
diff --git a/modules/src/string/strncmp.c b/modules/src/string/strncmp.c
deleted file mode 100644
index c9464765c..000000000
--- a/modules/src/string/strncmp.c
+++ /dev/null
@@ -1,26 +0,0 @@
-/* $Id$ */
-/*
- * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
- * See the copyright notice in the ACK home directory, in the file "Copyright".
- */
-/*	return negative, zero or positive value if
-	resp. s < t, s == t or s > t; compare at most n characters
-*/
-
-#include "ack_string.h"
-
-int
-strncmp(s, t, n)
-	register _CONST char *s, *t;
-	register _SIZET n;
-{
-	while (n-- > 0) {
-		if (*s == *t++) {
-			if (*s++ == '\0')
-				return 0;
-		}
-		else
-			return *s - *--t;
-	}
-	return 0;
-}
diff --git a/modules/src/string/strncpy.c b/modules/src/string/strncpy.c
deleted file mode 100644
index a12f80c64..000000000
--- a/modules/src/string/strncpy.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/* $Id$ */
-/*
- * (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
- * See the copyright notice in the ACK home directory, in the file "Copyright".
- */
-/* Copy t into s, upto n characters
-*/
-
-#include "ack_string.h"
-
-char *
-strncpy(s, t, n)
-	register char *s;
-	register _CONST char *t;
-	register _SIZET n;
-{
-	register char *b = s;
-
-	while ((n-- > 0) && (*s++ = *t++))
-		;
-	return b;
-}