--- Builder.php	2009-05-05 09:41:01.000000000 -0700
+++ Builder.php	2009-05-05 08:43:28.000000000 -0700
@@ -457,7 +457,16 @@
             $callback[0]->debug = $olddbg;
         }
 
-        $exitcode = is_resource($pp) ? pclose($pp) : -1;
+        if (is_resource($pp)) {
+            $exitcode = pclose($pp);
+            // If PHP was compiled with --enable-sigchild, pclose() return 
+            // values cannot be trusted. (See http://bugs.php.net/bug.php?id=29123)
+            if ($this->_hasConfigureSetting('enable-sigchild') && $exitcode == -1) {
+                $exitcode = 0;
+            }
+        } else {
+            $exitcode = -1;
+        }
         return ($exitcode == 0);
     }
 
@@ -471,4 +480,35 @@
         }
         return PEAR_Common::log($level, $msg);
     }
+    
+    /**
+     * See if PHP was built with the particular configuration setting.
+     * Useful for checking whether --enable-sigchild is active; if it
+     * is, pclose() return values can't be trusted.
+     * 
+     * @param string $setting the setting to check for. Will automatically
+     * have any leading dashes stripped.
+     *
+     * @return bool whether the setting is present
+     */
+    
+    function _hasConfigureSetting($setting) {
+        $setting = preg_replace("/^-+/", '', $setting);
+
+        ob_start();
+        phpinfo(1);
+        $cc = ob_get_clean();
+        foreach (explode("\n", $cc) as $line) {
+            if (array_shift(explode(' => ', $line)) == "Configure Command") {
+                $config = explode('___', preg_replace("/'\s+'/", "'___'", array_pop(explode(' => ', $line, 2))));
+                break;
+            }
+        }
+        foreach ($config as $opt) {
+            if (false !== strpos($opt, $setting)) {
+                return true;
+            }
+        }
+        return false;
+    }
 }
\ No newline at end of file