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diff --git a/libpthread/linuxthreads/debug.h b/libpthread/linuxthreads/debug.h
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+/****************************************************************************
+**
+** NAME:
+** debug.h
+**
+** DESCRIPTION:
+** This header file defines the debug macros used in pthreads. To turn
+** debugging on, add -DDEBUG_PT to CFLAGS. It was added to the original
+** distribution of linuxthreads.
+**
+** This program is free software; you can redistribute it and/or
+** modify it under the terms of the GNU Library General Public License
+** as published by the Free Software Foundation; either version 2
+** of the License, or (at your option) any later version.
+**
+** This program 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 Library General Public License for more details.
+**
+****************************************************************************/
+
+#ifndef _PT_DEBUG_H
+#define _PT_DEBUG_H
+
+/* include asserts for now */
+#define DO_ASSERT
+
+/* define the PDEBUG macro here */
+#undef PDEBUG
+#ifdef DEBUG_PT
+# define PDEBUG(fmt, args...) __pthread_message(__FUNCTION__": " fmt, ## args)
+#else
+# define PDEBUG(fmt, args...) /* debug switched off */
+#endif
+
+/* nothing; placeholder to disable a PDEBUG message but don't delete it */
+#undef PDEBUGG
+#define PDEBUGG(fmt, args...)
+
+/* Define ASSERT to stop/warn. Should be void in production code */
+#undef ASSERT
+#ifdef DO_ASSERT
+# define ASSERT(x) if (!(x)) fprintf(stderr, "pt: assertion failed in %s:%i.\n",\
+ __FILE__, __LINE__)
+#else
+# define ASSERT(x)
+#endif
+
+#endif /* _PT_DEBUG_H */