Add makeenv.1 and README

Signed-off-by: Mattias Andrée <maandree@kth.se>

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+NAME
+	makeenv - Run make(1) with environment loaded from .makeenv
+
+SYNPOSIS
+	makeenv [arguments] ...
+
+DESCRIPTION
+	The makeenv utility opens the file .makeenv if it exists in the
+	current working directory and scans it for options, macros, and
+	targets to specify along with the provided arguments when it
+	executes make(1). Any macro listed in .makeenv is also put in
+	the environment.
+
+	After loading .makeenv and adding populating the environment,
+	makeenv will inspect it's environment, makeenv itself is
+	affected by the environment variables, which also are make(1)
+	macros; this if you need a specific implementation of make(1)
+	for a project, it can be specified in the .makeenv file.
+
+	When executng make(1), makeenv may reorder the arguments, and
+	will put any option listed in .makeenv at the beginning, any
+	macro listed in .makeenv before the macros in the arguments,
+	and any target listed in .makeenv before the targets in the
+	arguments.
+
+	makeenv is designed to be usable in place of make(1), that is,
+	the user can create add the alias makeenv=make in his shell,
+	without any adverse affect. makeenv will pass on it's arguments
+	as is to make(1) (or whichever utility is specified in the
+	environment variable MAKEENV_MAKE or the environment variable
+	MAKE) without validation or modifications, if the .makeenv does
+	not exist.
+
+OPTIONS
+	The makeenv utility passes it's options to the make(1) utility
+	and do not act on any of the it self, however in order to
+	properly interleave options and operands specified in the
+	.makeenv file, it have to understand which options take an
+	argument and which do not. By default, the makeenv utility only
+	understands the options specified by POSIX, and the argumented
+	option -W (vendor options), as well as long options that start
+	with two dashes (--) provided that the same command line
+	argument contains an equals sign (=). The user can modify the
+	environment variables to modify how the makeenv utility
+	understands the options. See the section ENVIRONMENT VARIABLES
+	for more information. The current version only support options
+	that consist of a dash (-) followed by any other character and
+	options that start with two dashes (--), followed by at least
+	one character, but may not contain an equals sign (=), as these
+	are treated as delimiters between long options and their
+	associated argument.
+
+STDIN
+	Not used.
+
+INPUT FILES
+	None.
+
+ENVIRONMENT VARIABLES
+	The following environment variables affect the execution of
+	makeenv:
+
+	PATH
+		Default.
+
+	MAKEENV_MAKE, MAKE
+		The command that shall be invoked by the utility. The
+		environment variable MAKEENV_MAKE has precedence over
+		MAKE; MAKE is only used if MAKEENV_MAKE is not defined.
+		If neither is defined, the default value make is used.
+
+	MAKEENV_OPTS_NO_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that do not have any argument. (Default is
+		eiknpqrSst, meaning the options -e, -i, -k, -n, -p, -q,
+		-r, -S, -s, and -t.)
+
+	MAKEENV_OPTS_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that have an argument. (Default is fW, meaning
+		the options -f and -W.)
+
+	MAKEENV_OPTS_OPT_ATTACHED_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that have an argument only if there are
+		additional characters after the option character in the
+		same command line argument. (Default is the empty
+		string, meaning no options.)
+
+	MAKEENV_OPTS_OPT_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that have an argument if there are additional
+		characters after the option character in the same
+		command line argument or if argument is followed
+		directly by another argument which does not start with
+		a dash (-). (Default is the empty string, meaning no
+		options.)
+
+	MAKEENV_LONG_OPTS_NO_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that do not have any argument. (Default is
+		eiknpqrSst, meaning the options -e, -i, -k, -n, -p, -q,
+		-r, -S, -s, and -t.)
+
+	MAKEENV_OPTS_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that have an argument. (Default is fW, meaning
+		the options -f and -W.)
+
+	MAKEENV_OPTS_OPT_ATTACHED_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that have an argument only if there are
+		additional characters after the option character in
+		the same command line argument. (Default is the empty
+		string, meaning no options.)
+
+	MAKEENV_OPTS_OPT_ARG
+		List of options that makeenv shall interpret as make(1)
+		options that have an argument if there are additional
+		characters after the option character in the same
+		command line argument or if argument is followed
+		directly by another argument which does not start with
+		a dash (-). (Default is the empty string, meaning no
+		options.)
+
+	MAKEENV_LONG_OPTS_NO_ARG
+		Space-separated list of long options that makeenv shall
+		interpret as make(1) options that do not have any
+		argument unless it is followed directly by an equals
+		sign (=) in the same command line argument. Options
+		that do not start with two dashes (--) are silently
+		ignored. (Default is the empty string, meaning no
+		options.)
+
+	MAKEENV_LONG_OPTS_ARG
+		Space-separated list of long options that makeenv shall
+		interpret as make(1) options that have an argument that
+		must either be specified in the next command line
+		argument or after an equals sign (=) the shall directly
+		follow the option string in the same command line
+		argument. Options that do not start with two dashes
+		(--) are silently ignored. (Default is the empty string,
+		meaning no options.)
+
+	MAKEENV_LONG_OPTS_OPT_ARG
+		Space-separated list of long options that makeenv shall
+		interpret as make(1) options that have an argument if
+		it is the option string is is directly followed by
+		equals sign (=) in the same command line argument or if
+		argument is followed directly by another argument which
+		does not start with a dash (-). Options that do not
+		start with two dashes (--) are silently ignored.
+		(Default is the empty string, meaning no options.)
+
+	Any macro listed in .makeenv is loaded into the environment
+	before the utility inspects the environement.
+
+ASYNCHRONOUS EVENTS
+	Default.
+
+STDOUT
+	Not used.
+
+STDERR
+	The standard error is used only for diagnostic messages.
+
+OUTPUT FILES
+	None.
+
+EXTENDED DESCRIPTION
+	None.
+
+EXIT STATUS
+	If the make(1) utility is invoked, the exit status of makeenv
+	is the exit status of the make(1); utility otherwise, the
+	makeenv utility exits with one of the following values:
+
+	125	An error occurred in the makeenv utility.
+
+	126	The make(1) utility was found but could not be invoked.
+
+	127	The make(1) utility could not be found.
+
+CONSEQUENCES OF ERRORS
+	Default.
+
+FUTURE DIRECTIONS
+	None.
+
+SEE ALSO
+	makeenv(5), make(1)