#3 configure continues without flex/yacc

[Michael Bunk]

1. had no flex/yacc installed - compile didn't work,
but configure did
(had expected configure to check whether one of them
is available)

2. had yacc: error during compilation (sorry, didn't
catch correct error msg)

3. with yacc&flex installed it worked (guess it used
flex... :)

4. didn't try flex only

[Aleksey Cheusov]

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fixed in 1.9.14