diff -ru aacgain-1.9-orig/aacgain/linux/prepare.sh aacgain-1.9/aacgain/linux/prepare.sh
--- aacgain-1.9-orig/aacgain/linux/prepare.sh	2013-02-19 07:00:54.313006065 +0100
+++ aacgain-1.9/aacgain/linux/prepare.sh	2013-02-19 07:01:42.849006331 +0100
@@ -51,7 +51,11 @@
 #remove obsolete config.h; a correct one will be created by automake's configure
 rm -f ../../mp3gain/mpglibDBL/config.h
 #correct header include paths
-patch -p0 -N <mp3gain.patch
+sed -i 's:../../::' mp3gain.patch
+old="$(pwd)"
+cd ../..
+patch -p0 -N <"${old}/mp3gain.patch"
+cd "$old"
 
 echo Creating the configure script
 cp -p configure.ac ../..