diff --git a/headers/posix/math.h b/headers/posix/math.h
index edce3eb21c..9eed5322cf 100644
--- a/headers/posix/math.h
+++ b/headers/posix/math.h
@@ -189,7 +189,6 @@ extern double	yn(int x, double y);
 /* other stuff as defined in BeOS */
 extern int		isinff(float value);
 extern int		finitef(float value);
-extern float	infnanf(int error);
 extern float	dremf(float x, float y);
 extern float	significandf(float x);
 extern float	copysignf(float x, float y);
diff --git a/headers/posix/string.h b/headers/posix/string.h
index cb660f8326..aec0079488 100644
--- a/headers/posix/string.h
+++ b/headers/posix/string.h
@@ -59,7 +59,6 @@ extern char		*strcasestr(const char *string, const char *searchString);
 
 extern char		*strdup(const char *string);
 extern char		*stpcpy(char *dest, const char *source);
-extern const char *strtcopy(char *dest, const char *source);
 
 extern size_t	strlcat(char *dest, const char *source, size_t length);
 extern size_t	strlcpy(char *dest, const char *source, size_t length);
diff --git a/src/system/libroot/posix/glibc/misc/Jamfile b/src/system/libroot/posix/glibc/misc/Jamfile
index 100afe1ce7..d984af7c9e 100644
--- a/src/system/libroot/posix/glibc/misc/Jamfile
+++ b/src/system/libroot/posix/glibc/misc/Jamfile
@@ -15,6 +15,7 @@ SubDirCcFlags -D_GNU_SOURCE -DUSE_IN_LIBIO ;
 MergeObject posix_gnu_misc.o :
 	dirname.c
 	insremque.c
+	lsearch.c
 	tsearch.c
 	efgcvt.c
 	efgcvt_r.c
diff --git a/src/system/libroot/posix/glibc/misc/lsearch.c b/src/system/libroot/posix/glibc/misc/lsearch.c
new file mode 100644
index 0000000000..057ff396e1
--- /dev/null
+++ b/src/system/libroot/posix/glibc/misc/lsearch.c
@@ -0,0 +1,59 @@
+/* Linear search functions.
+   Copyright (C) 1996,97,98,2002 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+   The GNU 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 2.1 of the License, or (at your option) any later version.
+
+   The GNU 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 GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <search.h>
+#include <string.h>
+
+
+void *
+lsearch (const void *key, void *base, size_t *nmemb, size_t size,
+	 __compar_fn_t compar)
+{
+  void *result;
+
+  /* Try to find it.  */
+  result = lfind (key, base, nmemb, size, compar);
+  if (result == NULL)
+    {
+      /* Not available.  Insert at the end.  */
+      result = memcpy (base + (*nmemb) * size, key, size);
+      ++(*nmemb);
+    }
+
+  return result;
+}
+
+
+void *
+lfind (const void *key, const void *base, size_t *nmemb, size_t size,
+       __compar_fn_t compar)
+{
+  const void *result = base;
+  size_t cnt = 0;
+
+  while (cnt < *nmemb && (*compar) (key, result) != 0)
+    {
+      result += size;
+      ++cnt;
+    }
+
+  return cnt < *nmemb ? (void *) result : NULL;
+}
+libc_hidden_def (lfind)