Hello.
How can I write a make rule to build a target that can be built in two
different ways, depending on which pre-requisite files are available?
For instance, suppose that the target file test.txt can be built in two
different ways, according to the following two rules:
test.txt: file1.txt
command1 $< $@
test.txt: file2.txt
command2 $< $@
If file1.txt exists (or can be built), then the first rule is
used. Otherwise the second rule is used.
Romildo
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