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* libiberty.h (PEX_STDERR_TO_PIPE): New define. (PEX_BINARY_ERROR): New define. (pex_read_err): New function. libiberty/ * pex-common.h (struct pex_obj): New fields stderr_pipe and read_err. * pex-common.c (pex_init_common): Initialize stderr_pipe. (pex_run_in_environment): Add error checking for PEX_STDERR_TO_PIPE. Create a pipe for stderr if necessary. (pex_read_err): New. (pex_free): Close read_err. * pexecute.txh: Document changes. * functions.texi: Regenerated.