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diff --git a/Tools/tex.py b/Tools/tex.py
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+++ b/Tools/tex.py
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+#!/usr/bin/env python
+# encoding: utf-8
+# Thomas Nagy, 2006-2018 (ita)
+
+"""
+TeX/LaTeX/PDFLaTeX/XeLaTeX support
+
+Example::
+
+	def configure(conf):
+		conf.load('tex')
+		if not conf.env.LATEX:
+			conf.fatal('The program LaTex is required')
+
+	def build(bld):
+		bld(
+			features = 'tex',
+			type     = 'latex', # pdflatex or xelatex
+			source   = 'document.ltx', # mandatory, the source
+			outs     = 'ps', # 'pdf' or 'ps pdf'
+			deps     = 'crossreferencing.lst', # to give dependencies directly
+			prompt   = 1, # 0 for the batch mode
+		)
+
+Notes:
+
+- To configure with a special program, use::
+
+     $ PDFLATEX=luatex waf configure
+
+- This tool does not use the target attribute of the task generator
+  (``bld(target=...)``); the target file name is built from the source
+  base name and the output type(s)
+"""
+
+import os, re
+from waflib import Utils, Task, Errors, Logs, Node
+from waflib.TaskGen import feature, before_method
+
+re_bibunit = re.compile(r'\\(?P<type>putbib)\[(?P<file>[^\[\]]*)\]',re.M)
+def bibunitscan(self):
+	"""
+	Parses TeX inputs and try to find the *bibunit* file dependencies
+
+	:return: list of bibunit files
+	:rtype: list of :py:class:`waflib.Node.Node`
+	"""
+	node = self.inputs[0]
+
+	nodes = []
+	if not node:
+		return nodes
+
+	code = node.read()
+	for match in re_bibunit.finditer(code):
+		path = match.group('file')
+		if path:
+			found = None
+			for k in ('', '.bib'):
+				# add another loop for the tex include paths?
+				Logs.debug('tex: trying %s%s', path, k)
+				fi = node.parent.find_resource(path + k)
+				if fi:
+					found = True
+					nodes.append(fi)
+					# no break
+			if not found:
+				Logs.debug('tex: could not find %s', path)
+
+	Logs.debug('tex: found the following bibunit files: %s', nodes)
+	return nodes
+
+exts_deps_tex = ['', '.ltx', '.tex', '.bib', '.pdf', '.png', '.eps', '.ps', '.sty']
+"""List of typical file extensions included in latex files"""
+
+exts_tex = ['.ltx', '.tex']
+"""List of typical file extensions that contain latex"""
+
+re_tex = re.compile(r'\\(?P<type>usepackage|RequirePackage|include|bibliography([^\[\]{}]*)|putbib|includegraphics|input|import|bringin|lstinputlisting)(\[[^\[\]]*\])?{(?P<file>[^{}]*)}',re.M)
+"""Regexp for expressions that may include latex files"""
+
+g_bibtex_re = re.compile('bibdata', re.M)
+"""Regexp for bibtex files"""
+
+g_glossaries_re = re.compile('\\@newglossary', re.M)
+"""Regexp for expressions that create glossaries"""
+
+class tex(Task.Task):
+	"""
+	Compiles a tex/latex file.
+
+	.. inheritance-diagram:: waflib.Tools.tex.latex waflib.Tools.tex.xelatex waflib.Tools.tex.pdflatex
+	"""
+
+	bibtex_fun, _ = Task.compile_fun('${BIBTEX} ${BIBTEXFLAGS} ${SRCFILE}', shell=False)
+	bibtex_fun.__doc__ = """
+	Execute the program **bibtex**
+	"""
+
+	makeindex_fun, _ = Task.compile_fun('${MAKEINDEX} ${MAKEINDEXFLAGS} ${SRCFILE}', shell=False)
+	makeindex_fun.__doc__ = """
+	Execute the program **makeindex**
+	"""
+
+	makeglossaries_fun, _ = Task.compile_fun('${MAKEGLOSSARIES} ${SRCFILE}', shell=False)
+	makeglossaries_fun.__doc__ = """
+	Execute the program **makeglossaries**
+	"""
+
+	def exec_command(self, cmd, **kw):
+		"""
+		Executes TeX commands without buffering (latex may prompt for inputs)
+
+		:return: the return code
+		:rtype: int
+		"""
+		if self.env.PROMPT_LATEX:
+			# capture the outputs in configuration tests
+			kw['stdout'] = kw['stderr'] = None
+		return super(tex, self).exec_command(cmd, **kw)
+
+	def scan_aux(self, node):
+		"""
+		Recursive regex-based scanner that finds included auxiliary files.
+		"""
+		nodes = [node]
+		re_aux = re.compile(r'\\@input{(?P<file>[^{}]*)}', re.M)
+
+		def parse_node(node):
+			code = node.read()
+			for match in re_aux.finditer(code):
+				path = match.group('file')
+				found = node.parent.find_or_declare(path)
+				if found and found not in nodes:
+					Logs.debug('tex: found aux node %r', found)
+					nodes.append(found)
+					parse_node(found)
+		parse_node(node)
+		return nodes
+
+	def scan(self):
+		"""
+		Recursive regex-based scanner that finds latex dependencies. It uses :py:attr:`waflib.Tools.tex.re_tex`
+
+		Depending on your needs you might want:
+
+		* to change re_tex::
+
+			from waflib.Tools import tex
+			tex.re_tex = myregex
+
+		* or to change the method scan from the latex tasks::
+
+			from waflib.Task import classes
+			classes['latex'].scan = myscanfunction
+		"""
+		node = self.inputs[0]
+
+		nodes = []
+		names = []
+		seen = []
+		if not node:
+			return (nodes, names)
+
+		def parse_node(node):
+			if node in seen:
+				return
+			seen.append(node)
+			code = node.read()
+			for match in re_tex.finditer(code):
+
+				multibib = match.group('type')
+				if multibib and multibib.startswith('bibliography'):
+					multibib = multibib[len('bibliography'):]
+					if multibib.startswith('style'):
+						continue
+				else:
+					multibib = None
+
+				for path in match.group('file').split(','):
+					if path:
+						add_name = True
+						found = None
+						for k in exts_deps_tex:
+
+							# issue 1067, scan in all texinputs folders
+							for up in self.texinputs_nodes:
+								Logs.debug('tex: trying %s%s', path, k)
+								found = up.find_resource(path + k)
+								if found:
+									break
+
+
+							for tsk in self.generator.tasks:
+								if not found or found in tsk.outputs:
+									break
+							else:
+								nodes.append(found)
+								add_name = False
+								for ext in exts_tex:
+									if found.name.endswith(ext):
+										parse_node(found)
+										break
+
+							# multibib stuff
+							if found and multibib and found.name.endswith('.bib'):
+								try:
+									self.multibibs.append(found)
+								except AttributeError:
+									self.multibibs = [found]
+
+							# no break, people are crazy
+						if add_name:
+							names.append(path)
+		parse_node(node)
+
+		for x in nodes:
+			x.parent.get_bld().mkdir()
+
+		Logs.debug("tex: found the following : %s and names %s", nodes, names)
+		return (nodes, names)
+
+	def check_status(self, msg, retcode):
+		"""
+		Checks an exit status and raise an error with a particular message
+
+		:param msg: message to display if the code is non-zero
+		:type msg: string
+		:param retcode: condition
+		:type retcode: boolean
+		"""
+		if retcode != 0:
+			raise Errors.WafError('%r command exit status %r' % (msg, retcode))
+
+	def info(self, *k, **kw):
+		try:
+			info = self.generator.bld.conf.logger.info
+		except AttributeError:
+			info = Logs.info
+		info(*k, **kw)
+
+	def bibfile(self):
+		"""
+		Parses *.aux* files to find bibfiles to process.
+		If present, execute :py:meth:`waflib.Tools.tex.tex.bibtex_fun`
+		"""
+		for aux_node in self.aux_nodes:
+			try:
+				ct = aux_node.read()
+			except EnvironmentError:
+				Logs.error('Error reading %s: %r', aux_node.abspath())
+				continue
+
+			if g_bibtex_re.findall(ct):
+				self.info('calling bibtex')
+
+				self.env.env = {}
+				self.env.env.update(os.environ)
+				self.env.env.update({'BIBINPUTS': self.texinputs(), 'BSTINPUTS': self.texinputs()})
+				self.env.SRCFILE = aux_node.name[:-4]
+				self.check_status('error when calling bibtex', self.bibtex_fun())
+
+		for node in getattr(self, 'multibibs', []):
+			self.env.env = {}
+			self.env.env.update(os.environ)
+			self.env.env.update({'BIBINPUTS': self.texinputs(), 'BSTINPUTS': self.texinputs()})
+			self.env.SRCFILE = node.name[:-4]
+			self.check_status('error when calling bibtex', self.bibtex_fun())
+
+	def bibunits(self):
+		"""
+		Parses *.aux* file to find bibunit files. If there are bibunit files,
+		runs :py:meth:`waflib.Tools.tex.tex.bibtex_fun`.
+		"""
+		try:
+			bibunits = bibunitscan(self)
+		except OSError:
+			Logs.error('error bibunitscan')
+		else:
+			if bibunits:
+				fn  = ['bu' + str(i) for i in range(1, len(bibunits) + 1)]
+				if fn:
+					self.info('calling bibtex on bibunits')
+
+				for f in fn:
+					self.env.env = {'BIBINPUTS': self.texinputs(), 'BSTINPUTS': self.texinputs()}
+					self.env.SRCFILE = f
+					self.check_status('error when calling bibtex', self.bibtex_fun())
+
+	def makeindex(self):
+		"""
+		Searches the filesystem for *.idx* files to process. If present,
+		runs :py:meth:`waflib.Tools.tex.tex.makeindex_fun`
+		"""
+		self.idx_node = self.inputs[0].change_ext('.idx')
+		try:
+			idx_path = self.idx_node.abspath()
+			os.stat(idx_path)
+		except OSError:
+			self.info('index file %s absent, not calling makeindex', idx_path)
+		else:
+			self.info('calling makeindex')
+
+			self.env.SRCFILE = self.idx_node.name
+			self.env.env = {}
+			self.check_status('error when calling makeindex %s' % idx_path, self.makeindex_fun())
+
+	def bibtopic(self):
+		"""
+		Lists additional .aux files from the bibtopic package
+		"""
+		p = self.inputs[0].parent.get_bld()
+		if os.path.exists(os.path.join(p.abspath(), 'btaux.aux')):
+			self.aux_nodes += p.ant_glob('*[0-9].aux')
+
+	def makeglossaries(self):
+		"""
+		Lists additional glossaries from .aux files. If present, runs the makeglossaries program.
+		"""
+		src_file = self.inputs[0].abspath()
+		base_file = os.path.basename(src_file)
+		base, _ = os.path.splitext(base_file)
+		for aux_node in self.aux_nodes:
+			try:
+				ct = aux_node.read()
+			except EnvironmentError:
+				Logs.error('Error reading %s: %r', aux_node.abspath())
+				continue
+
+			if g_glossaries_re.findall(ct):
+				if not self.env.MAKEGLOSSARIES:
+					raise Errors.WafError("The program 'makeglossaries' is missing!")
+				Logs.warn('calling makeglossaries')
+				self.env.SRCFILE = base
+				self.check_status('error when calling makeglossaries %s' % base, self.makeglossaries_fun())
+				return
+
+	def texinputs(self):
+		"""
+		Returns the list of texinput nodes as a string suitable for the TEXINPUTS environment variables
+
+		:rtype: string
+		"""
+		return os.pathsep.join([k.abspath() for k in self.texinputs_nodes]) + os.pathsep
+
+	def run(self):
+		"""
+		Runs the whole TeX build process
+
+		Multiple passes are required depending on the usage of cross-references,
+		bibliographies, glossaries, indexes and additional contents
+		The appropriate TeX compiler is called until the *.aux* files stop changing.
+		"""
+		env = self.env
+
+		if not env.PROMPT_LATEX:
+			env.append_value('LATEXFLAGS', '-interaction=batchmode')
+			env.append_value('PDFLATEXFLAGS', '-interaction=batchmode')
+			env.append_value('XELATEXFLAGS', '-interaction=batchmode')
+
+		# important, set the cwd for everybody
+		self.cwd = self.inputs[0].parent.get_bld()
+
+		self.info('first pass on %s', self.__class__.__name__)
+
+		# Hash .aux files before even calling the LaTeX compiler
+		cur_hash = self.hash_aux_nodes()
+
+		self.call_latex()
+
+		# Find the .aux files again since bibtex processing can require it
+		self.hash_aux_nodes()
+
+		self.bibtopic()
+		self.bibfile()
+		self.bibunits()
+		self.makeindex()
+		self.makeglossaries()
+
+		for i in range(10):
+			# There is no need to call latex again if the .aux hash value has not changed
+			prev_hash = cur_hash
+			cur_hash = self.hash_aux_nodes()
+			if not cur_hash:
+				Logs.error('No aux.h to process')
+			if cur_hash and cur_hash == prev_hash:
+				break
+
+			# run the command
+			self.info('calling %s', self.__class__.__name__)
+			self.call_latex()
+
+	def hash_aux_nodes(self):
+		"""
+		Returns a hash of the .aux file contents
+
+		:rtype: string or bytes
+		"""
+		try:
+			self.aux_nodes
+		except AttributeError:
+			try:
+				self.aux_nodes = self.scan_aux(self.inputs[0].change_ext('.aux'))
+			except IOError:
+				return None
+		return Utils.h_list([Utils.h_file(x.abspath()) for x in self.aux_nodes])
+
+	def call_latex(self):
+		"""
+		Runs the TeX compiler once
+		"""
+		self.env.env = {}
+		self.env.env.update(os.environ)
+		self.env.env.update({'TEXINPUTS': self.texinputs()})
+		self.env.SRCFILE = self.inputs[0].abspath()
+		self.check_status('error when calling latex', self.texfun())
+
+class latex(tex):
+	"Compiles LaTeX files"
+	texfun, vars = Task.compile_fun('${LATEX} ${LATEXFLAGS} ${SRCFILE}', shell=False)
+
+class pdflatex(tex):
+	"Compiles PdfLaTeX files"
+	texfun, vars =  Task.compile_fun('${PDFLATEX} ${PDFLATEXFLAGS} ${SRCFILE}', shell=False)
+
+class xelatex(tex):
+	"XeLaTeX files"
+	texfun, vars = Task.compile_fun('${XELATEX} ${XELATEXFLAGS} ${SRCFILE}', shell=False)
+
+class dvips(Task.Task):
+	"Converts dvi files to postscript"
+	run_str = '${DVIPS} ${DVIPSFLAGS} ${SRC} -o ${TGT}'
+	color   = 'BLUE'
+	after   = ['latex', 'pdflatex', 'xelatex']
+
+class dvipdf(Task.Task):
+	"Converts dvi files to pdf"
+	run_str = '${DVIPDF} ${DVIPDFFLAGS} ${SRC} ${TGT}'
+	color   = 'BLUE'
+	after   = ['latex', 'pdflatex', 'xelatex']
+
+class pdf2ps(Task.Task):
+	"Converts pdf files to postscript"
+	run_str = '${PDF2PS} ${PDF2PSFLAGS} ${SRC} ${TGT}'
+	color   = 'BLUE'
+	after   = ['latex', 'pdflatex', 'xelatex']
+
+@feature('tex')
+@before_method('process_source')
+def apply_tex(self):
+	"""
+	Creates :py:class:`waflib.Tools.tex.tex` objects, and
+	dvips/dvipdf/pdf2ps tasks if necessary (outs='ps', etc).
+	"""
+	if not getattr(self, 'type', None) in ('latex', 'pdflatex', 'xelatex'):
+		self.type = 'pdflatex'
+
+	outs = Utils.to_list(getattr(self, 'outs', []))
+
+	# prompt for incomplete files (else the batchmode is used)
+	try:
+		self.generator.bld.conf
+	except AttributeError:
+		default_prompt = False
+	else:
+		default_prompt = True
+	self.env.PROMPT_LATEX = getattr(self, 'prompt', default_prompt)
+
+	deps_lst = []
+
+	if getattr(self, 'deps', None):
+		deps = self.to_list(self.deps)
+		for dep in deps:
+			if isinstance(dep, str):
+				n = self.path.find_resource(dep)
+				if not n:
+					self.bld.fatal('Could not find %r for %r' % (dep, self))
+				if not n in deps_lst:
+					deps_lst.append(n)
+			elif isinstance(dep, Node.Node):
+				deps_lst.append(dep)
+
+	for node in self.to_nodes(self.source):
+		if self.type == 'latex':
+			task = self.create_task('latex', node, node.change_ext('.dvi'))
+		elif self.type == 'pdflatex':
+			task = self.create_task('pdflatex', node, node.change_ext('.pdf'))
+		elif self.type == 'xelatex':
+			task = self.create_task('xelatex', node, node.change_ext('.pdf'))
+
+		task.env = self.env
+
+		# add the manual dependencies
+		if deps_lst:
+			for n in deps_lst:
+				if not n in task.dep_nodes:
+					task.dep_nodes.append(n)
+
+		# texinputs is a nasty beast
+		if hasattr(self, 'texinputs_nodes'):
+			task.texinputs_nodes = self.texinputs_nodes
+		else:
+			task.texinputs_nodes = [node.parent, node.parent.get_bld(), self.path, self.path.get_bld()]
+			lst = os.environ.get('TEXINPUTS', '')
+			if self.env.TEXINPUTS:
+				lst += os.pathsep + self.env.TEXINPUTS
+			if lst:
+				lst = lst.split(os.pathsep)
+			for x in lst:
+				if x:
+					if os.path.isabs(x):
+						p = self.bld.root.find_node(x)
+						if p:
+							task.texinputs_nodes.append(p)
+						else:
+							Logs.error('Invalid TEXINPUTS folder %s', x)
+					else:
+						Logs.error('Cannot resolve relative paths in TEXINPUTS %s', x)
+
+		if self.type == 'latex':
+			if 'ps' in outs:
+				tsk = self.create_task('dvips', task.outputs, node.change_ext('.ps'))
+				tsk.env.env = dict(os.environ)
+			if 'pdf' in outs:
+				tsk = self.create_task('dvipdf', task.outputs, node.change_ext('.pdf'))
+				tsk.env.env = dict(os.environ)
+		elif self.type == 'pdflatex':
+			if 'ps' in outs:
+				self.create_task('pdf2ps', task.outputs, node.change_ext('.ps'))
+	self.source = []
+
+def configure(self):
+	"""
+	Find the programs tex, latex and others without raising errors.
+	"""
+	v = self.env
+	for p in 'tex latex pdflatex xelatex bibtex dvips dvipdf ps2pdf makeindex pdf2ps makeglossaries'.split():
+		try:
+			self.find_program(p, var=p.upper())
+		except self.errors.ConfigurationError:
+			pass
+	v.DVIPSFLAGS = '-Ppdf'
+