Makefiles articles collection

Variable assignment types in Makefiles

= or := or ?= or +=

http://stackoverflow.com/questions/448910/makefile-variable-assignment 

Blunders of recursive variables

http://electric-cloud.com/blog/2009/03/makefile-performance-shell/ 

VPATH & vpath

http://www.cmcrossroads.com/article/basics-vpath-and-vpath 

Running external commands using $(shell)

http://electric-cloud.com/blog/2009/03/makefile-performance-shell/