emerge fails with: checking for x86_64-pc-linux-gnu-pkg-config... /usr/bin/x86_64-pc-linux-gnu-pkg-config checking pkg-config is at least version 0.9.0... yes checking for LIBSPECTRUM... no configure: error: Package requirements (libspectrum >= 1.3.6) were not met: RDEPEND has: # grep libspectrum fuse-1.3.8.ebuild RDEPEND=">=app-emulation/libspectrum-1.3.5 Switching this to 1.3.6 which is already in the tree works.
Fixed by https://github.com/gentoo/gentoo/commit/cbc166bbfc2edabf2e604535b3852e2370ae523b