Adding extra options to recipes based on Autotools

Let’s assume we have Autotools-based application, along with a preexisting recipe for it, and we want to do the following:

• Enable my-feature
• Disable another-feature

The content of the .bbappend file to make the changes will be the following:

Figure 13.2 – Adding extra configuration to the Autoconf flags

The same strategy can be used if we need to enable it conditionally based on the hardware we are building for, as follows:

Figure 13.3 – Conditionally adding extra configuration to the Autoconf flags

The Yocto Project supports many different build systems, and the variables to configure them are shown in the following table:

Build System	Variable
Autotools	EXTRA_OECONF
Cargo ...