rpm/macros.kernel-source: echo "%%{expand:%%(test -z '%flavors_to_build'
&& echo %%%%internal_kmp_error)}" \
so probably after warning
Macro %flavors_to_build needs whitespace before body
the macro was not defined but rpm does not show the offending code, it does not
say why it thinks that the body started without whitespace when the macro
syntax is vaguely defined as the body starting after whitespace.