The spec file build section contains the commands to build the software. Usually, this will include just a few commands, since most of the real instructions appear in the Makefile. For example:

%build

./configure CXXFLAGS=-O3 --prefix=$RPM_BUILD_ROOT/usr

make

The build section starts with a %build statement.

The commands shown for this build section run the configure script, covered in the previous section on Linux build tools, and then run the make command with the default maketarget. If things unfold as they should, this procedure builds the software.