Created attachment 291065 [details] build.log (dev-util/pkgconfig was not installed) checking for x86_64-pc-linux-gnu-pkg-config... no checking for pkg-config... no checking for HUNSPELL... no configure: error: in `/var/tmp/portage/app-text/mythes-1.2.1/work/mythes-1.2.1': configure: error: The pkg-config script could not be found or is too old. Make sure it is in your PATH or set the PKG_CONFIG environment variable to the full path to pkg-config. Alternatively, you may set the environment variables HUNSPELL_CFLAGS and HUNSPELL_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. After installing dev-util/pkgconfig mythes builds fine.
In main tree, thanks for report.