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diff --git a/cinelerra-5.1/cinelerra/threadexec.h b/cinelerra-5.1/cinelerra/threadexec.h
new file mode 100644
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+++ b/cinelerra-5.1/cinelerra/threadexec.h
@@ -0,0 +1,67 @@
+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU 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 General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#ifndef THREADEXEC_H
+#define THREADEXEC_H
+
+
+// Construct command arguments, exec a background function with
+// command line arguments, and wait for it.
+
+
+
+// The reason we do this is that execvp and threading don't work together.
+
+#include <stdio.h>
+#include <stdint.h>
+
+#include "bcwindowbase.inc"
+#include "mutex.inc"
+#include "thread.h"
+
+
+class ThreadExec : public Thread
+{
+public:
+	ThreadExec();
+	virtual ~ThreadExec();
+	
+	FILE* get_stdin();
+	void run();
+	void start_command(const char *command_line, int pipe_stdin);
+	virtual void run_program(int argc, char *argv[], int stdin_fd);
+	
+	
+private:
+	int filedes[2];
+	char **arguments;
+	char path[BCTEXTLEN];
+	int total_arguments;
+	FILE *stdin_fd;
+	Mutex *start_lock;
+	const char *command_line;
+	int pipe_stdin;
+};
+
+
+
+
+#endif