From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bernhard Fischer <rep.dot.nop@gmail.com>
Date: Mon, 20 Aug 2007 20:11:51 +0200
Subject: [Buildroot] [PATCH] Fix sed fail when building qtopia
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To: buildroot@busybox.net

On Mon, Aug 20, 2007 at 07:00:17PM +0100, Thiago A. Corr?a wrote:
>Hi there,
>
>   This patch should fix the error:
>   sed: -e expression #1, char 21: unknown option to `s'
>
>   I am sure there is a better way to do this, but I'm not comfortable
>with shell scripts enough, so, if someone has a better solution, by
>all means :)

ergh, that's rather ugly.
Please try to use this instead and let me know if that works for you:
$(SED) 's,-O2,$(TARGET_CFLAGS),' \
$(QTOPIA4_TARGET_DIR)/mkspecs/qws/linux-$(BR2_PACKAGE_QTOPIA4_EMB_PLATFORM)-g++/qmake.conf

(i.e. use ',' instead if '/'.