[Bug 197188] lang/erlang: configure fails when dtrace is enabled on 10.1R-amd64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197188

            Bug ID: 197188
           Summary: lang/erlang: configure fails when dtrace is enabled on
                    10.1R-amd64
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: olgeni at FreeBSD.org
          Reporter: dch at skunkwerks.at
          Assignee: olgeni at FreeBSD.org
             Flags: maintainer-feedback?(olgeni at FreeBSD.org)
                CC:

Created attachment 152355
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=152355&action=edit
erl 17.3 config failre

Building either in local ports tree, or via poudriere:

checking for 1-stage DTrace precompilation... dtrace: failed to compile script
emulator/beam/erlang_dtrace.d: "/usr/lib/dtrace/io.d", line 43: operator ->
cannot be applied to a forward declaration: no struct devstat definition is
available
configure: error: Could not precompile erlang_dtrace.d: dtrace -h failed
configure: error: /bin/sh
'/wrkdirs/usr/ports/lang/erlang-runtime17/work/otp_src_17.4/erts/configure'
failed for erts
===>  Script "configure" failed unexpectedly.

I believe that `dtrace -h` requires root privileges to run, not sure how that
can work within poudriere etc, viz
https://github.com/jj1bdx/erlang-freebsd-port#dtrace-support

Adding 
```
diff --git i/lang/erlang/Makefile w/lang/erlang/Makefile
index 1094185..cc8e776 100644
--- i/lang/erlang/Makefile
+++ w/lang/erlang/Makefile
@@ -92,6 +92,7 @@ USE_GCC?=     yes

 .if ${PORT_OPTIONS:MDTRACE}
 CONFIGURE_ARGS+=--with-dynamic-trace=dtrace
+NEED_ROOT=yes
 .else
 CONFIGURE_ARGS+=--without-dynamic-trace
 .endif
```

I'm not clear how to apply this to my poudriere setup for testing, but I guess
it would work fine as well there.

DTrace + OTP is a wonderful combo, I hope we can find a fix for this!

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