Conditionals, step one

[Radly]

Problems like this make me feel like a beginner...

I have a project that needs to detect OSTYPE and set LIBS and LIBDIRS
accordingly, but I can't get basic conditionals working.  This doesn't work
on either Mac OSX or Ubuntu Linux; they both use Make 3.81.  Here's a
stripped-down demo of my problem:

OS = $OSTYPE

ifeq ($(value OS), darwin10.0)
  TXT = GOT_IT
else
  TXT = MISSED_IT
endif

all:
        @echo OS = $(value OS)
        @echo $(TXT)

And here's the printed output:
OS = darwin10.0
MISSED_IT

I've tried multiple variations on the ifeq test, and they all fail,
producing the "MISSED_IT" text.

Surely I'm missing something that will be obvious to someone else.  What
might it be?


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