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diff --git a/src/linker/linker_environ.h b/src/linker/linker_environ.h
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+++ b/src/linker/linker_environ.h
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+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ */
+#ifndef LINKER_ENVIRON_H
+#define LINKER_ENVIRON_H
+
+/* Call this function before anything else. 'vecs' must be the pointer
+ * to the environment block in the ELF data block. The function returns
+ * the start of the aux vectors after the env block.
+ */
+extern unsigned*   apkenv_linker_env_init(unsigned* vecs);
+
+/* Unset a given environment variable. In case the variable is defined
+ * multiple times, unset all instances. This modifies the environment
+ * block, so any pointer returned by linker_env_get() after this call
+ * might become invalid */
+extern void        apkenv_linker_env_unset(const char* name);
+
+
+/* Returns the value of environment variable 'name' if defined and not
+ * empty, or NULL otherwise. Note that the returned pointer may become
+ * invalid if linker_env_unset() or linker_env_secure() are called
+ * after this function. */
+extern const char* apkenv_linker_env_get(const char* name);
+
+/* Remove unsecure environment variables. This should be used when
+ * running setuid programs. */
+extern void        apkenv_linker_env_secure(void);
+
+#endif /* LINKER_ENVIRON_H */