Makevars and Makeconf sequencing
http://cran.r-project.org/doc/manuals/R-exts.html#Configure-and-cleanup near the start of 1.2.1 Using Makevars says
There are some macros which are set whilst configuring the building of R itself and are stored in R_HOME/etcR_ARCH/Makeconf. That makefile is included as a Makefile after Makevars[.win], and the macros it defines can be used in macro assignments and make command lines in the latter.
I'm confused. If Makeconf is included after Makevars, then how can Makevars use macros defined in Makeconf? Or is the meaning only that a variable definition in Makeconf can be overridden in Makevars? Ross Boylan