This thing does not need X at all. Instead, it requires media-libs/jpeg and media-libs/libpng which are missing in DEPEND. # ldd `which mvc` linux-gate.so.1 => (0xffffe000) libjpeg.so.62 => /usr/lib/libjpeg.so.62 (0xb7eef000) libpng12.so.0 => /usr/lib/libpng12.so.0 (0xb7eca000) libc.so.6 => /lib/libc.so.6 (0xb7d8d000) libz.so.1 => /lib/libz.so.1 (0xb7d7c000) libm.so.6 => /lib/libm.so.6 (0xb7d55000) /lib/ld-linux.so.2 (0xb7f23000)
Fixed by almost rewriting the ebuild.