Export command in Mac OS X

I am working in SIP based project. The app should support for multiple architecture. So I have to export the following command to give the permission.

export LDFLAGS += -mar开发者_开发知识库ch=armv7 -mcpu=arm1176jzf-s -mcpu=cortex-a8

But when I run in the Terminal, I am getting following error message. Please tell me how to export the about command in Terminal.

-bash: export: `+=': not a valid identifier
-bash: export: `-march=armv7': not a valid identifier
-bash: export: `-mcpu=arm1176jzf-s': not a valid identifier
-bash: export: `-mcpu=cortex-a8': not a valid identifier

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You want:

export LDFLAGS+=" -march=armv7 -mcpu=arm1176jzf-s -mcpu=cortex-a8"