Что за формат DjVu?

GNU make will not modify these environment variables if they already exist when it starts. Here is a summary of the features of GNU make, for comparison with and credit to other versions of make. We consider the features of make in 4.2 BSD systems as a baseline. If you are concerned with writing portable makefiles, you should not use the features of make listed here, nor the ones in Incompatibilities and Missing Features. The VPATH variable and its special meaning. See Searching Directories for Prerequisites. This feature exists in System V make, but is undocumented. It is documented in 4.3 BSD make (which says it mimics System V’s VPATH feature). Included makefiles. See Including Other Makefiles. Allowing multiple files to be included with a single directive is a GNU extension. Variables are read from and communicated via the environment. See Variables from the Environment. Options passed through the variable MAKEFLAGS to recursive invocations of make.
Buttons allow users to initiate an action or command when clicked or tapped. The button’s label or text description indicates the purpose of the action to the user. At GitHub, buttons are a fundamental building block of our products. Most of the time, we use the secondary variant, but other variants of buttons may be used to indicate something special about the button’s hierarchy or functionality. Trailing actions such as dropdown carets are always locked to the end of a button, which is particularly obvious for full width scenarios. If a button is a call-to-action (Submit, Save, Do this, etc), its contents (visuals and button label) appear center-aligned inside the button container. If a button is used for selecting items (Weeks ▾, Iteration ▾, Sort ▾, Select ▾, etc), its contents (visuals and button label) appear left-aligned inside the button container. Leading visuals provide additional context for a button label, such as a “search” icon next to the label for a search field submit.
For example, if foo.c also exists, the implicit rule to make an object file from a C source file is used instead, because it appears before the Pascal rule in the list of predefined implicit rules (see Catalogue of Built-In Rules). If you do not want an implicit rule to be used for a target that has no recipe, you can give that target an empty recipe by writing a semicolon (see Defining Empty Recipes). Here is a catalogue of predefined implicit rules which are always available unless the makefile explicitly overrides or cancels them. See Canceling Implicit Rules, for information on canceling or overriding an implicit rule. The ‘-r’ or ‘—no-builtin-rules’ option cancels all predefined rules. This manual only documents the default rules available on POSIX-based operating systems. Other operating systems, such as VMS, Windows, OS/2, etc. To see the full list of default rules and variables available in your version of GNU make, run ‘make -p’ in a directory with no makefile.
You may be inclined to define empty recipes for targets that are not actual files, but only exist so that their prerequisites can be remade. However, this is not the best way to do that, because the prerequisites may not be remade properly if the target file actually does exist. See Phony Targets, for a better way to do this. A variable is a name defined in a makefile to represent a string of text, called the variable’s value. These values are substituted by explicit request into targets, prerequisites, recipes, and other parts of the makefile. ’, and the bodies of variable definitions using the define directive. The value a variable expands to is that of its most recent definition at the time of expansion. In other words, variables are dynamically scoped. Variables can represent lists of file names, options to pass to compilers, programs to run, directories to look in for source files, directories to write output in, or anything else you can imagine.
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