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diff --git a/Build/source/texk/kpathsea/xputenv.c b/Build/source/texk/kpathsea/xputenv.c
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+/* xputenv.c: set an environment variable without return. */
+
+/* Copyright 1993-98, 2008, 2009 Karl Berry.
+ Copyright 2003-05 Olaf Weber.
+
+ This 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.
+
+ This 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 this library; if not, see <http://www.gnu.org/licenses/>. */
+
+
+#include <kpathsea/config.h>
+#include <kpathsea/types.h>
+
+#ifdef WIN32
+#include <stdlib.h>
+#else
+#if !HAVE_DECL_PUTENV
+extern int putenv (char* entry);
+#endif
+#endif /* not WIN32 */
+
+/*
+ * We have different arguments from the "standard" function. A separate
+ * var and value tends to be much more practical.
+ *
+ * The standards for putenv are clear: put the passed string into the
+ * environment, and if you alter that string, the environment changes.
+ * Of course various implementations are broken in a number of ways,
+ * which include making copies of the passed string, and more.
+ */
+void
+kpathsea_xputenv(kpathsea kpse, const char *var, const char *value)
+{
+ char *cur_item;
+ char *old_item;
+ char *new_item;
+ size_t var_lim;
+ int cur_loc;
+
+ /* kpse_debug2(KPSE_DEBUG_VARS, "kpse_putenv($%s,%s)", var, value); */
+
+ old_item = NULL;
+ cur_item = concat3(var, "=", value);
+ /* Include '=' in length. */
+ var_lim = strlen(var) + 1;
+
+ /* Have we stored something for this value already? */
+ for (cur_loc = 0; cur_loc != kpse->saved_count; ++cur_loc) {
+ if (strncmp(kpse->saved_env[cur_loc], cur_item, var_lim) == 0) {
+ /* Get the old value. We need this is case another part
+ * of the program didn't use us to change the environment.
+ */
+ old_item = getenv(var);
+ break;
+ }
+ }
+
+ if (old_item && strcmp(old_item, cur_item+var_lim) == 0) {
+ /* Set same value as is in environment, don't bother to set. */
+ free(cur_item);
+ return;
+ } else {
+ /* We set a different value. */
+ if (putenv(cur_item) < 0)
+ LIB_FATAL1("putenv(%s)", cur_item);
+ /* Get the new string. */
+ new_item = getenv(var);
+ if (new_item != cur_item+var_lim) {
+ /* Our new string isn't used, don't keep it around. */
+ free(cur_item);
+ return;
+ }
+ }
+
+ /* If we get here, it means getenv() returned a reference to cur_item.
+ So we save cur_item, and free the old string we also owned. */
+ if (cur_loc == kpse->saved_count) {
+ /* No old string. */
+ kpse->saved_count++;
+ XRETALLOC(kpse->saved_env, kpse->saved_count, char *);
+ } else {
+ /* We owned the old string. */
+ free(kpse->saved_env[cur_loc]);
+ }
+ kpse->saved_env[cur_loc] = cur_item;
+
+ return;
+}
+
+/* A special case for setting a variable to a numeric value
+ (specifically, KPATHSEA_DPI). We don't need to dynamically allocate
+ and free the string for the number, since it's saved as part of the
+ environment value. */
+
+void
+kpathsea_xputenv_int (kpathsea kpse, const_string var_name, int num)
+{
+ char str[MAX_INT_LENGTH];
+ sprintf (str, "%d", num);
+
+ kpathsea_xputenv (kpse, var_name, str);
+}
+
+#if defined (KPSE_COMPAT_API)
+void
+xputenv (const char *var, const char *value)
+{
+ kpathsea_xputenv (kpse_def, var, value);
+}
+
+void
+xputenv_int (const_string var_name, int num)
+{
+ kpathsea_xputenv_int(kpse_def, var_name, num);
+}
+#endif