diff -up comm-release/mozilla/configure.in.subdir-optflags comm-release/mozilla/configure.in --- comm-release/mozilla/configure.in.subdir-optflags 2013-10-29 02:20:42.000000000 +0100 +++ comm-release/mozilla/configure.in 2013-10-31 13:07:41.015647853 +0100 @@ -6936,7 +6936,7 @@ MOZ_ARG_ENABLE_STRING(optimize, [ if test "$enableval" != "no"; then MOZ_OPTIMIZE=1 if test -n "$enableval" -a "$enableval" != "yes"; then - MOZ_OPTIMIZE_FLAGS=`echo "$enableval" | sed -e 's|\\\ | |g'` + MOZ_OPTIMIZE_FLAGS=`echo "$enableval" | sed -e 's|\\\\\\\ | |g'` MOZ_OPTIMIZE=2 fi else