Target specific package compilation by including/excluding dependent packages

For Developers
1

We have some common packages meant for x86 and ARM target. Those common packages have some dependant package meant for ARM alone and not needed for x86.

What's the best way I can compile the common packages by including/excluding dependent package?

I tried adding @!TARGET_x86 under DEPENDS, no luck.

Tried adding ifdef to skip copying of files during install as below but its not working:

ifdef CONFIG_TARGET_x86
define Build/InstallDev
    $(INSTALL_DIR) $(1)/usr/lib
    $(INSTALL_BIN) $(OBJ)/libtransport.so* $(1)/usr/lib/
endef

define Package/libtransport/install
    $(INSTALL_DIR) $(1)/usr/lib
    $(INSTALL_BIN) files/XXX.so* $(1)/usr/lib/
endef
endif
2

The makefiles I've seen doing that sort of selection use the in-line checks, like this: https://github.com/openwrt/packages/blob/master/net/snort3/Makefile#L30

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