The name change of this fork is not a random, arbitrary whim: it reflects my different personal focus for the project, which is "the make applet in BusyBox-w32", rather than being a POSIX make. In fact, none of the extensions (plus a Windows build...) I plan to add are POSIX.

Also, further down the road, the "visionary goal" is to make this make so compelling and practical (e.g. for bootstrapping systems) that BB upstream will eventually feel the need to integrate a make utility, and indeed an extended version of PDPMAKE (or something that has the features I plan to have here).

Public domain POSIX make

This is an implementation of POSIX make.

It should build on most modernish Unix-style systems:

• It comes with its own makefile, naturally, but if you don't have a make binary already the command cc -o make *.c should get you started.

• Command line options may not work properly due to differences in how getopt(3) is reset. Adjust GETOPT_RESET() in make.h for your platform, if necessary.

The default configuration enables extensions: some from a future POSIX standard and some that are non-POSIX. Generally these extensions are compatible with GNU make:

• double-colon rules
• -include to ignore missing include files
• include files are created if required
• ifdef/ifndef/else/endif conditionals
• lib.a(mem1.o mem2.o...) syntax for archive members
• :=/::=/:::=/+=/?=/!= macro assignments
• macro expansions can be nested
• chained inference rules
• */?/[] wildcards for filenames in target rules
• $(SRC:%.c=%.o) pattern macro expansions
• special handling of MAKE macro
• $^ and $+ internal macros
• skip duplicate entries in $?
• .PHONY special target
• -C directory and -j maxjobs command line options
• # doesn't start a comment in macro expansions or command lines

When extensions are enabled adding the .POSIX target to your makefile will disable them. Other versions of make tend to allow extensions even in POSIX mode.

Setting the environment variable PDPMAKE_POSIXLY_CORRECT (its value doesn't matter) or giving the --posix option as the first on the command line also turn off extensions.