diff --git a/app-games/fceux/autobuild/beyond b/app-games/fceux/autobuild/beyond
new file mode 100644
index 00000000000..16b76e40b60
--- /dev/null
+++ b/app-games/fceux/autobuild/beyond
@@ -0,0 +1,4 @@
+abinfo "Removing CHM files..."
+find "$PKGDIR"/usr/share/fceux/ -name "*.chm" -delete -print
+abinfo "Removing DLL files..."
+find "$PKGDIR"/usr/share/fceux/ -name "*.dll" -delete -print
diff --git a/app-games/fceux/autobuild/defines b/app-games/fceux/autobuild/defines
new file mode 100644
index 00000000000..3c7aa744102
--- /dev/null
+++ b/app-games/fceux/autobuild/defines
@@ -0,0 +1,11 @@
+PKGNAME=fceux
+PKGSEC=games
+PKGDEP="sdl2 qt-6 lua-5.1 x264 x265 ffmpeg libarchive minizip zlib"
+PKGDES="Famicom/Nintendo Entertainment System (NES) emulator"
+
+# Note: Upstream recommends using GNU Makefile.
+#
+# https://github.com/TASEmulators/fceux/blob/d339f1fa0cd8b69cc637a0de3fb3f04cb28748ea/README#L41
+ABTYPE=cmake
+
+CMAKE_AFTER="-DGLVND=1 -DQT6=1"
diff --git a/app-games/fceux/spec b/app-games/fceux/spec
new file mode 100644
index 00000000000..17b58dcd82f
--- /dev/null
+++ b/app-games/fceux/spec
@@ -0,0 +1,9 @@
+VER=2.6.6+git20251111
+
+# Note: Upstream tag 2.6.6 included a x86-only header
+#       and cannot be built on other architectures.
+#       Here use git snapshot with fixed code.
+COMMIT=d339f1fa0cd8b69cc637a0de3fb3f04cb28748ea
+SRCS="git::commit=$COMMIT;copy-repo=true::https://github.com/TASEmulators/fceux"
+CHKSUMS="SKIP"
+CHKUPDATE="anitya::id=12147"