Builder.diff

Index: PEAR/Builder.php
===================================================================
--- PEAR/Builder.php	(revision 312817)
+++ PEAR/Builder.php	(working copy)
@@ -288,12 +288,24 @@
         }
 
         // Find config. outside of normal path - e.g. config.m4
+        $tempDir = '';
         foreach (array_keys($pkg->getInstallationFileList()) as $item) {
-          if (stristr($item, 'config.')) {
-            $dir .= DIRECTORY_SEPARATOR . dirname($item);
+          $fileBaseName = basename($item);
+          
+          // the next line is more or less or guess
+          if (!stristr($fileBaseName, 'config.')) {
+            continue;
+          }
+          $tempDir = DIRECTORY_SEPARATOR . dirname($item);
+            
+          // If the file is not config.m4, we keep looking.
+          if (strtolower($fileBaseName) == 'config.m4') {
             break;
           }
         }
+        if (!empty($tempDir)) {
+          $dir .= $tempDir;
+        }
 
         $old_cwd = getcwd();
         if (!file_exists($dir) || !is_dir($dir) || !chdir($dir)) {
@@ -513,4 +525,4 @@
         }
         return PEAR_Common::log($level, $msg);
     }
-}
\ No newline at end of file
+}