1 files changed, 17 insertions, 1 deletions
diff --git a/ext/psych/extconf.rb b/ext/psych/extconf.rb
index 5e50432..a859c98 100644
--- a/ext/psych/extconf.rb
+++ b/ext/psych/extconf.rb
@@ -2,8 +2,24 @@ require 'mkmf'
 
 $CFLAGS << " -O3 -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline"
 
+LIBDIR = Config::CONFIG['libdir']
+INCLUDEDIR = Config::CONFIG['includedir']
+
+LIB_DIRS = [
+  '/opt/local/lib',
+  '/usr/local/lib',
+  LIBDIR,
+  '/usr/lib',
+]
+
 libyaml = dir_config('libyaml', '/opt/local/include', '/opt/local/lib')
 
-find_header('yaml.h')
+unless find_header('yaml.h')
+  abort "yaml.y is missing.  try 'port install libyaml +universal' or 'yum install libyaml-devel'"
+end
+
+unless find_library('yaml', 'yaml_get_version')
+  abort "libyaml is missing.  try 'port install libyaml +universal' or 'yum install libyaml-devel'"
+end
 
 create_makefile('psych/psych')