targets starting with '/'

[Noel Yap]

The following makefile works perfectly:

.PHONY: all
all: ../install/GNUaoeu.mk
../install/%.mk: ../build/%.mk | ../install/.
        cp $(<) $(@)
../build/%.mk: ../src/%.mk | ../build/.
        cp $(<) $(@)
.PRECIOUS: %/.
%/.:
        mkdir -p $(@)
It's output is:

$ gmake -npqr | grep GNUaoeu.mk
all: ../install/GNUaoeu.mk
../install/GNUaoeu.mk: ../build/GNUaoeu.mk | ../install/.
../build/GNUaoeu.mk: ../src/GNUaoeu.mk | ../build/.
../src/GNUaoeu.mk:
$ gmake
mkdir -p ../build/.
cp ../src/GNUaoeu.mk ../build/GNUaoeu.mk
mkdir -p ../install/.
cp ../build/GNUaoeu.mk ../install/GNUaoeu.mk
rm ../build/GNUaoeu.mk
But if I start using absolute paths, things stop working:

.PHONY: all
all: /tmp/yapn/install/GNUaoeu.mk
/tmp/yapn/install/%.mk: /tmp/yapn/build/%.mk | /tmp/yapn/install/.
        cp $(<) $(@)
/tmp/yapn/build/%.mk: /tmp/yapn/src/%.mk | /tmp/yapn/build/.
        cp $(<) $(@)
.PRECIOUS: %/.
%/.:
        mkdir -p $(@)
$ gmake -npqr | grep GNUaoeu.mk
gmake: *** No rule to make target `/tmp/yapn/install/GNUaoeu.mk', needed by `all'.  
Stop.
all: /tmp/yapn/install/GNUaoeu.mk
/tmp/yapn/install/GNUaoeu.mk:
$ gmake
gmake: *** No rule to make target `/tmp/yapn/install/GNUaoeu.mk', needed by `all'.  
Stop.
IIRC, there's special treatment for targets that start with '/'.  Can someone point me to where in the docs it talks about this, please?

Thanks,
Noel
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