Description - Mks.com

target file name.
.SOURCE.x
Same as .SOURCE, except that make searches the .SOURCE.x list first when trying to
locate a file matching a target with a name that ends in the suffix .x.
.SUFFIXES
make appends the prerequisite list of this target to the set of suffixes used when trying to
infer a prerequisite for making a target using suffix rules. If you specify no prerequisites,
make clears the list of suffixes, effectively disabling suffix rules from that point on.
Control Macros
make defines a number of control macros that, like special target directives and attributes, alter its
behavior. A control macro that has the same function as a special target or attribute also has the
same name.
Macros that are said to be defined internally are automatically created by make and you can use
them with the usual $(name construct. For example, you can use $(PWD) to obtain the current
directory name.
Recognized control macros are:
DIRSEPSTR
Contains the characters used to separate parts in a path name and can be set by the user.
make uses the first character in this string to build path names when necessary.
Note:
The DIRSEPSTR macro must be set in your environment before running make, so that
the MAKEDIR macro is aware of its value. This is necessary because MAKEDIR is set
before the makefile or command-line flags are looked at.
.EPILOG
If assigned a non-empty value, the .EPILOG attribute is given to every target.
GROUPFLAGS
Specifies options to pass to GROUPSHELL when make invokes it to execute a group recipe.
GROUPSHELL
Gives the path name of the command interpreter (shell) that make calls to process group
recipes.
GROUPSUFFIX
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