Bug#886355: libpar-packer-perl: frequent parallel FTBFS

[Adrian Bunk]

Source: libpar-packer-perl
Version: 1.041-1
Severity: serious

https://buildd.debian.org/status/package.php?p=libpar-packer-perl&suite=sid

...
dh_auto_build
	make -j6
make[2]: Entering directory '/<<PKGBUILDDIR>>'
cp script/par.pl blib/script/par.pl
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/par.pl
make[3]: Entering directory '/<<PKGBUILDDIR>>/myldr'
Makefile:855: warning: overriding recipe for target '.c.o'
Makefile:336: warning: ignoring old recipe for target '.c.o'
cp script/pp blib/script/pp
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/pp
cp script/tkpp blib/script/tkpp
"/usr/bin/perl" -MExtUtils::MY -e 'MY->fixin(shift)' -- blib/script/tkpp
"/usr/bin/perl" par_pl2c.pl my_par_pl < ../script/par.pl > my_par_pl.c 
"/usr/bin/perl" sha1.c.PL
Can't locate PAR/Filter/PodStrip.pm in @INC (you may need to install the PAR::Filter::PodStrip module) (@INC contains: /<<PKGBUILDDIR>>/myldr/../blib/arch /<<PKGBUILDDIR>>/myldr/../blib/lib /etc/perl /usr/local/lib/aarch64-linux-gnu/perl/5.26.1 /usr/local/share/perl/5.26.1 /usr/lib/aarch64-linux-gnu/perl5/5.26 /usr/share/perl5 /usr/lib/aarch64-linux-gnu/perl/5.26 /usr/share/perl/5.26 /usr/local/lib/site_perl /usr/lib/aarch64-linux-gnu/perl-base .) at par_pl2c.pl line 7.
BEGIN failed--compilation aborted at par_pl2c.pl line 7.
Makefile:879: recipe for target 'my_par_pl.c' failed
make[3]: *** [my_par_pl.c] Error 2


This is due to dh compat 10 defaulting to parallel building.

Ideally the build should be fixed to work with parallel building,
but if that's not easily possible the following patch to go back
to non-parallel building is sufficient to fix the bug:

--- debian/rules.old	2018-01-04 20:32:58.184625753 +0000
+++ debian/rules	2018-01-04 20:33:08.360625656 +0000
@@ -10,7 +10,7 @@
 ARCHLIB := $(shell perl -MConfig -e 'print $$Config{vendorarch}')
 
 %:
-	dh $@
+	dh $@ --no-parallel
 
 override_dh_auto_build:
 	dh_auto_build