These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.86 s (backtrack: 0/20).


!!! The ebuild selected to satisfy "dev-ada/libadalang:0/25.0.0[ada_target_gcc_14(-)?,ada_target_gcc_15(-)?,ada_target_gcc_16(-)?,-ada_target_gcc_12(-),-ada_target_gcc_13(-),static-libs?,static-pic?]" has unmet requirements.
- dev-ada/libadalang-25.0.0-r1::gentoo USE="-doc -static-libs -static-pic -test" ADA_TARGET="gcc_15 -gcc_12 -gcc_13 -gcc_14 (-gcc_16)" PYTHON_SINGLE_TARGET="-python3_12 -python3_13"

  The following REQUIRED_USE flag constraints are unsatisfied:
    exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 )

  The above constraints are a subset of the following complete expression:
    exactly-one-of ( python_single_target_python3_12 python_single_target_python3_13 ) exactly-one-of ( ada_target_gcc_14 ada_target_gcc_15 ada_target_gcc_16 )

(dependency required by "dev-ada/lal-refactor-25.0.0-r2::gentoo" [ebuild])
(dependency required by "=dev-ada/lal-refactor-25.0.0-r2" [argument])