From 521e4de22d2e689d714f6abf4e296ebe2161ec1c Mon Sep 17 00:00:00 2001
From: Lamont Granquist <lamont@scriptkiddie.org>
Date: Sun, 6 Jul 2014 13:12:54 -0700
Subject: build with system libs if libyajl2-gem missing libs

libyajl2-gem with USE_SYSTEM_LIBYAJL2=1 is just missing the libs
and includes in the path, so if we can't find libyajl2 after setting
up the libyajl2-gem, then go hunting for libyajl2 in the system
and/or use the --with-yajl-include/dir/lib options
---
 ext/ffi_yajl/ext/encoder/extconf.rb | 31 +++++++++++++++++++++++++++++++
 ext/ffi_yajl/ext/parser/extconf.rb  | 31 +++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)

diff --git a/ext/ffi_yajl/ext/encoder/extconf.rb b/ext/ffi_yajl/ext/encoder/extconf.rb
index 9d048ee..e752b28 100644
--- a/ext/ffi_yajl/ext/encoder/extconf.rb
+++ b/ext/ffi_yajl/ext/encoder/extconf.rb
@@ -28,6 +28,37 @@ if windows?
   $libs = "#{$libs} -lyajldll"
 end
 
+def found_libyajl2
+  find_header('yajl/yajl_tree.h') && find_library('yajl', 'yajl_complete_parse')
+end
+
+if !windows? && !found_libyajl2
+  puts "libyajl2 not embedded in libyajl2-gem, searching for system libraries..."
+
+  HEADER_DIRS = [
+    # FIXME: embedded version number in Homebrew path will change
+    "/usr/local/Cellar/yajl/2.1.0/include", # Homebrew (yick)
+    "/opt/local/include",                   # MacPorts
+    "/usr/local/include",                   # /usr/local
+    RbConfig::CONFIG['includedir'],         # Ruby
+    "/usr/include",                         # (default)
+  ]
+
+  LIB_DIRS = [
+    "/opt/local/lib",                       # MacPorts
+    "/usr/local/lib",                       # /usr/local + Homebrew
+    RbConfig::CONFIG['libdir'],             # Ruby
+    "/usr/lib",                             # (default)
+  ]
+
+  # add --with-yajl-dir, --with-yajl-include, --with-yajl-lib
+  dir_config('yajl', HEADER_DIRS, LIB_DIRS)
+
+  if !found_libyajl2
+    abort "libyajl2 is missing.  please install libyajl2"
+  end
+end
+
 dir_config 'encoder'
 
 create_makefile 'ffi_yajl/ext/encoder'
diff --git a/ext/ffi_yajl/ext/parser/extconf.rb b/ext/ffi_yajl/ext/parser/extconf.rb
index 602f679..e5ff74d 100644
--- a/ext/ffi_yajl/ext/parser/extconf.rb
+++ b/ext/ffi_yajl/ext/parser/extconf.rb
@@ -28,6 +28,37 @@ if windows?
   $libs = "#{$libs} -lyajldll"
 end
 
+def found_libyajl2
+  find_header('yajl/yajl_tree.h') && find_library('yajl', 'yajl_complete_parse')
+end
+
+if !windows? && !found_libyajl2
+  puts "libyajl2 not embedded in libyajl2-gem, searching for system libraries..."
+
+  HEADER_DIRS = [
+    # FIXME: embedded version number in Homebrew path will change
+    "/usr/local/Cellar/yajl/2.1.0/include", # Homebrew (yick)
+    "/opt/local/include",                   # MacPorts
+    "/usr/local/include",                   # /usr/local
+    RbConfig::CONFIG['includedir'],         # Ruby
+    "/usr/include",                         # (default)
+  ]
+
+  LIB_DIRS = [
+    "/opt/local/lib",                       # MacPorts
+    "/usr/local/lib",                       # /usr/local + Homebrew
+    RbConfig::CONFIG['libdir'],             # Ruby
+    "/usr/lib",                             # (default)
+  ]
+
+  # add --with-yajl-dir, --with-yajl-include, --with-yajl-lib
+  dir_config('yajl', HEADER_DIRS, LIB_DIRS)
+
+  if !found_libyajl2
+    abort "libyajl2 is missing.  please install libyajl2"
+  end
+end
+
 dir_config 'parser'
 
 create_makefile 'ffi_yajl/ext/parser'
-- 
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