Description: ability to use system-wide libyaml
 Link with libyaml when USE_SYSTEM_LIBYAML is present in the environment.
 .
 This probably needs more work like moving bundled libyaml in a subdirectory
 and recurse in it only if needed, but this patch is useful for Debian as it
 is, because it allows us to strip the bindled libyaml from the sources and
 link with the system-wide libyaml.
 .
 The open_ended=0 setting is there to prevent libyaml from appending document
 end marker ('...') when dumping. It is optional according to the spec and its
 presence breaks a couple of tests.
Bug: https://github.com/ingydotnet/yaml-libyaml-pm/issues/49
Bug-Debian: https://bugs.debian.org/664224
Forwarded: https://github.com/ingydotnet/yaml-libyaml-pm/pull/78
Author: Damyan Ivanov <dmn@debian.org>
Reviewed-by: gregor herrmann <gregoa@debian.org>
Last-Update: 2019-01-03

--- a/LibYAML/Makefile.PL
+++ b/LibYAML/Makefile.PL
@@ -24,7 +24,7 @@ WriteMakefile(
     # CCFLAGS => '-pedantic -Wall',
     # CCFLAGS => '-Wall',
     DEFINE => $DEFINE,
-    LIBS => [''], # e.g., '-lm'
+    LIBS => [$ENV{USE_SYSTEM_LIBYAML} ? '-lyaml' : ()], # e.g., '-lm'
     INC => '-I.',
     OBJECT => $obj_files,
     ABSTRACT_FROM => 'lib/YAML/XS/LibYAML.pm',
--- a/LibYAML/perl_libyaml.c
+++ b/LibYAML/perl_libyaml.c
@@ -840,6 +840,8 @@ dump_document(perl_yaml_dumper_t *dumper
     yaml_emitter_emit(&dumper->emitter, &event_document_start);
     dump_node(dumper, node);
     yaml_document_end_event_initialize(&event_document_end, 1);
+    // suppress end-of-document marker ('...')
+    dumper->emitter.open_ended = 0;
     yaml_emitter_emit(&dumper->emitter, &event_document_end);
 }