Bug#927739: FTBFS: undefined reference to `yylex'

[Santiago Vila <sanvila@unex.es>]

On Mon, Apr 22, 2019 at 12:33:11PM +0300, Sebastian Dröge wrote:
> Source: libkate
> Version: 0.4.1-9
> Severity: serious
> 
> Hi,
> 
> Something seems to have changed with flex, which causes the package to now
> fail to build:
> 
> /bin/bash ../libtool  --tag=CC  --silent --mode=link gcc -Wall -W    -I/usr/include/libpng16 -g -O2 -fdebug-prefix-map=/home/slomo/tmp/foo/libkate-0.4.1=. -fstack-protector-strong -Wformat -Werror=format-security  -Wl,-z,relro -Wl,-z,now -o kateenc kateenc-kateenc.o kateenc-kate_lexer.o kateenc-kate_parser.o kateenc-kpng.o ../lib/liboggkate.la ../lib/libkate.la -logg -lpng16 -lz -lfl 
> /usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/8/../../../x86_64-linux-gnu/libfl.so: undefined reference to `yylex'
> collect2: error: ld returned 1 exit status

I can build libkate in my autobuilders.

I also triggered a rebuild in reproducible-builds and it worked:

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libkate.html

Can you reproduce the failure in another system?
Does the failure happen always, or it happens randomly?

Thanks.