[Coin-discuss] interpret this please

[Michael Hennebry]

export ifprefix = $(if ${1},$(addprefix ${1},${2}),)

It's in Makefiles/Makefile.coin .
How is it used?
When are ${1} and ${2} expanded?
Why is it?

Between the includes, the recursive calls,
and the complex individual constructions,
the build system is pretty much impossible
for me to follow.

I forgot to mention the rather hairy mechanisms
for getting arguments to the compiler.
The latter, especially the -D's,
are the primary reason I even use COIN
build system instead of replacing it
with something I can understand.

-- 
Mike   hennebry at web.cs.ndsu.NoDak.edu
"There are three kinds of people,
those who can count and those who can't."