diff -up /backend.py.ptch /backend.py
--- /backend.py.ptch	2009-11-23 14:34:58.000000000 -0600
+++ /backend.py	2009-12-11 14:17:56.000000000 -0600
@@ -202,6 +202,21 @@ class AnacondaBackend:
                 os.unlink(self._loopbackFile)
             except SystemError:
                 pass
+   
+    def freetmp(self, anaconda):
+    # installs that don't use /mnt/stage2 hold the install.img on
+    # a tmpfs, free this ram if things are tight.
+        stage2img = "/tmp/install.img"
+        if os.path.exists(stage2img) and iutil.memAvailable() < isys.MIN_GUI_RAM:
+            log.info("%s exists and low memory" % stage2img )
+            # free up /tmp for more memory before yum is called,
+            if self.mountInstallImage(anaconda, stage2img):
+               	return DISPATCH_BACK
+            try:
+                os.unlink(stage2img)
+            except SystemError:
+                log.info("clearing /tmp failed")
+                return DISPATCH_BACK
 
     def kernelVersionList(self, rootPath="/"):
         return []