[ffigen] Clarify LLVM error messages (#93)

diff --git a/pkgs/ffigen/CHANGELOG.md b/pkgs/ffigen/CHANGELOG.md
index 38fcaa2..95e0eff 100644
--- a/pkgs/ffigen/CHANGELOG.md
+++ b/pkgs/ffigen/CHANGELOG.md

@@ -1,3 +1,6 @@
+# 0.2.4+1
+- Minor changes to dylib creation error log.
+
 # 0.2.4
 - Added support for C booleans as Uint8.
 - Added config `dart-bool` (default: true) to use dart bool instead of int in function parameters and return type.

diff --git a/pkgs/ffigen/bin/ffigen.dart b/pkgs/ffigen/bin/ffigen.dart
index d096914..a49040d 100644
--- a/pkgs/ffigen/bin/ffigen.dart
+++ b/pkgs/ffigen/bin/ffigen.dart

@@ -35,7 +35,7 @@
   /// `pub run ffigen:setup -Ipath/to/llvm/include -Lpath/to/llvm/lib`.
   if (!checkDylibExist() && !autoCreateDylib()) {
     _logger.severe('Unable to create dynamic library automatically.');
-    _logger.severe('If LLVM is installed, try running:');
+    _logger.severe('If LLVM (9+) is installed, try running:');
     _logger.severe(
         '  pub run ffigen:setup -Ipath/to/llvm/include -Lpath/to/llvm/lib');
     exit(1);

diff --git a/pkgs/ffigen/bin/setup.dart b/pkgs/ffigen/bin/setup.dart
index ef618fc..4c7517d 100644
--- a/pkgs/ffigen/bin/setup.dart
+++ b/pkgs/ffigen/bin/setup.dart

@@ -100,7 +100,7 @@
   final options = _getPlatformOptions();
   final processResult = _runClangProcess(options);
   if ((processResult.stderr as String).isNotEmpty) {
-    print(stderr);
+    print(processResult.stderr);
   }
   return checkDylibExist();
 }

diff --git a/pkgs/ffigen/pubspec.yaml b/pkgs/ffigen/pubspec.yaml
index 0d52538..ae53603 100644
--- a/pkgs/ffigen/pubspec.yaml
+++ b/pkgs/ffigen/pubspec.yaml

@@ -3,7 +3,7 @@
 # BSD-style license that can be found in the LICENSE file.
 
 name: ffigen
-version: 0.2.4
+version: 0.2.4+1
 homepage: https://github.com/dart-lang/ffigen
 description: Experimental generator for FFI bindings, using LibClang to parse C header files.