Original Make was butt simple: any lines that begin without tabs are a filename followed by list of other file dependencies, files whose modified date must be o

Original Make was butt simple: any lines that begin without tabs are a filename followed by list of other file dependencies, files whose modified date must be older than the filename at the start of the list. Than any lines of text immediately beneath that first line starting with a tab character are the shell commands to be executed in order that brings the first file up to date against it's dependencies. That was it, that is the entire original Makefile syntax. Then software vendors started adding extensions...