dev-haskell/hledger-web supports the "library-only" useflag: ❯ q use -eD library-only dev-haskell/hledger-web[library-only] Build for use with "yesod devel" This appears to have a similar effect as the more popular useflag "executable": ❯ q use -eD executable dev-haskell/bytedump[executable] build executable file dev-haskell/cpu[executable] build 'cpuid' tool dev-haskell/highlighting-kate[executable] Build the Highlight executable. dev-haskell/language-dot[executable] Build the `ppdot' executable dev-haskell/skylighting[executable] Build the skylighting executable. dev-haskell/skylighting-core[executable] Build the skylighting executable. dev-haskell/texmath[executable] Compile test executable. dev-haskell/zip-archive[executable] Build the Zip executable. dev-php/agavi[executable] Install the "agavi" executable used to manage projects. This requires dev-php/phing, and may be omitted if you are (for example) deploying an existing site to a production server. dev-haskell/bench-show[executable] Build executable as well as library dev-haskell/bytedump[executable] build executable file dev-haskell/citeproc[executable] Build citeproc executable dev-haskell/cpu[executable] build 'cpuid' tool dev-haskell/highlighter[executable] Install a "highlighter" executable dev-haskell/highlighting-kate[executable] Build the Highlight executable. dev-haskell/language-dot[executable] Build the `ppdot' executable dev-haskell/skylighting[executable] Whether to build the skylighting program dev-haskell/skylighting-core[executable] Build skylighting-extract tool dev-haskell/texmath[executable] Compile test executable. dev-haskell/zip-archive[executable] Build the Zip executable. It would be nice if the useflags could be unified.
Sorry, I did not notice that dev-haskell/hledger-web was actually from the haskell overlay. I created https://github.com/gentoo-haskell/gentoo-haskell/issues/1120 there.