nodejs compilation error

[Mayuresh <mayuresh%acm.org@localhost>]

On NetBSD 8 amd64 pkgsrc-current:

In file included from ../src/node_constants.h:27:0,
                 from ../src/node_options.h:10,
                 from ../src/inspector_agent.h:9,
                 from ../src/env.h:29,
                 from ../src/env-inl.h:28,
                 from ../src/node_constants.cc:22:
../src/node_constants.cc: In function 'void
node::{anonymous}::DefineSystemConstants(v8::Local<v8::Object>)
':
../src/node_constants.cc:1130:30: error: 'UV_FS_O_FILEMAP' was not
declared in this scope
 NODE_DEFINE_CONSTANT(target, UV_FS_O_FILEMAP);
                              ^
../src/node.h:433:54: note: in definition of macro 'NODE_DEFINE_CONSTANT'
         v8::Number::New(isolate, static_cast<double>(constant));
\
                                                      ^

Can't build firefox because of this.

I ended up running make update in libffi and that has deleted many
critical packages. I managed to recover by manually soft linking
libffi.so.6.0.4 which was lying in /usr/pkg/lib despite the upgrade to
libffi.so.6. Not a normal thing to do I suppose.

What will be a clean way when I want to build a new package that would
update a lower level library that would invalidate several other critical
packages that would not build! (Sorry for the length of that statement.)

May be I should be switching to using stable branches instead of
pkgsrc-current? May be that has its own downsides...

Mayuresh