Bug#838583: libconfig-model-lcdproc-perl: FTBFS with "Syntax error: spurious char at command end"

[Santiago Vila]

Package: src:libconfig-model-lcdproc-perl
Version: 2.049-1
Severity: serious

Dear Perl maintainers:

I tried to build this package in stretch with "dpkg-buildpackage -A"
(which is what the "Arch: all" autobuilder would do to build it)
but it failed:

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[...]
 debian/rules build-indep
dh build-indep
   dh_testdir -i
   dh_update_autotools_config -i
   dh_auto_configure -i
	perl -I. Build.PL --installdirs vendor --config "optimize=-g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2" --config "ld=x86_64-linux-gnu-gcc -g -O2 -fdebug-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -Wl,-z,relro"
Created MYMETA.yml and MYMETA.json
Creating new 'Build' script for 'Config-Model-LcdProc' version '--installdirs'
   debian/rules override_dh_auto_build
make[1]: Entering directory '/<<PKGBUILDDIR>>'
touch lcdproc/LCDd.conf
dh_auto_build
	perl Build
Load command error:
	command: 'max='
	Syntax error: spurious char at command end: '='. Did you forget double quotes ?
Exception thrown  at /usr/share/perl5/Config/Model/Exception.pm line 69.
	Config::Model::Exception::rethrow(Config::Model::Exception::Load=HASH(0x7bf99a8)) called at /usr/share/perl5/Config/Model/Exception.pm line 64
	Config::Model::Exception::throw("Config::Model::Exception::Load", "command", "max=", "error", "Syntax error: spurious char at command end: '='. Did you forg"...) called at /usr/share/perl5/Config/Model/Loader.pm line 161
	Config::Model::Loader::_split_cmd("max=") called at /usr/share/perl5/Config/Model/Loader.pm line 222
	Config::Model::Loader::_load(Config::Model::Loader=HASH(0x7ada6a0), Config::Model::Node=HASH(0x7d2e978), "yes", ARRAY(0x19ef0a0)) called at /usr/share/perl5/Config/Model/Loader.pm line 683
	Config::Model::Loader::_load_hash(Config::Model::Loader=HASH(0x7ada6a0), Config::Model::Node=HASH(0x78c2230), "yes", ARRAY(0x2ce4e78), ARRAY(0x19ef0a0)) called at /usr/share/perl5/Config/Model/Loader.pm line 296
	Config::Model::Loader::_load(Config::Model::Loader=HASH(0x7ada6a0), Config::Model::Node=HASH(0x78c2230), "yes", ARRAY(0x19ef0a0)) called at /usr/share/perl5/Config/Model/Loader.pm line 683
	Config::Model::Loader::_load_hash(Config::Model::Loader=HASH(0x7ada6a0), Config::Model::Node=HASH(0x26d4208), "yes", ARRAY(0x19fdec8), ARRAY(0x19ef0a0)) called at /usr/share/perl5/Config/Model/Loader.pm line 296
	Config::Model::Loader::_load(Config::Model::Loader=HASH(0x7ada6a0), Config::Model::Node=HASH(0x26d4208), "yes", ARRAY(0x19ef0a0), 1) called at /usr/share/perl5/Config/Model/Loader.pm line 80
	Config::Model::Loader::load(Config::Model::Loader=HASH(0x7ada6a0), "node", Config::Model::Node=HASH(0x26d4208), "steps", "class:\"LCDd::picolcd\" element:LircFlushThreshold type=leaf  v"...) called at /usr/share/perl5/Config/Model/Node.pm line 918
	Config::Model::Node::load(Config::Model::Node=HASH(0x26d4208), "class:\"LCDd::picolcd\" element:LircFlushThreshold type=leaf  v"...) called at script/lcdconf2model.pl line 342
Building lcdproc model from upstream LCDd.conf file...
note: unhandled legal  spec: '0x200-0x400'. Sending it back to doc
note: unhandled legal  spec: '1x1-640x480'. Sending it back to doc
lcdconf2model failed: 512 at /<<PKGBUILDDIR>>/_build/lib/Module/Build/Custom.pm line 8.
dh_auto_build: perl Build returned exit code 2
debian/rules:7: recipe for target 'override_dh_auto_build' failed
make[1]: *** [override_dh_auto_build] Error 2
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
debian/rules:4: recipe for target 'build-indep' failed
make: *** [build-indep] Error 2
dpkg-buildpackage: error: debian/rules build-indep gave error exit status 2
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The relevant part of the build log is included above.

It fails in unstable as well:

https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/libconfig-model-lcdproc-perl.html

As usual, if this is really a bug in one of the build-depends, please
use reassign and affects, so that this is still visible in the page
for this package. I tried to find some build-dependency to blame, but
did not found any.

Thanks.