Yocto Project override operators
From KoanSoftware Wiki
Yocto Project override operators
Override operators in Yocto Project
VARIABLENAME:prepend = " value" VARIABLENAME:append = " value" VARIABLENAME:remove = " value"
Although not recommended, worst case, you can also use the “forcevariable” override, which is the strongest override possible. Here is an example:
VARIABLENAME:forcevariable = " value"