build: configure: Make dot optional.
* configure: Make dot optional.
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@ -374,7 +374,7 @@ Some influential environment variables:
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(make-dep "hex2" '(0 3))
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(make-dep "tcc" '(0 9 26) #:optional? #t #:version-option "-v")
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(make-dep "makeinfo" '(5) #:optional? #t)
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(make-dep "dot" '(2) #:version-option "-V")
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(make-dep "dot" '(2) #:version-option "-V" #:optional? #t)
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(make-dep "help2man" '(1 47) #:optional? #t)
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(make-dep "perl" '(5) #:optional? #t)
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(make-dep "git" '(2) #:optional? #t))))
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