i'm having problems patching vanilla 2.6.12 with ingo molnar's latest rt_preempt ... [mrmachine@localhost linux-2.6.12]$ patch -p1 < ../realtime-preempt-2.6.12-final-V0.7.50-12 missing header for unified diff at line 5 of patch can't find file to patch at input line 5 Perhaps you used the wrong -p or --strip option? The text leading up to this was: -------------------------- |Index: Makefile |=================================================================== |--- Makefile.orig |+++ Makefile -------------------------- File to patch: i've successfully patched all the Release Candidates leading up to 2.6.12, so i don't know what the stumbling block is here ... any ideas?