diff --git a/pkgs/r/riscv-virt-rt.lua b/pkgs/r/riscv-virt-rt.lua
new file mode 100644
index 0000000..6da525e
--- /dev/null
+++ b/pkgs/r/riscv-virt-rt.lua
@@ -0,0 +1,87 @@
+-- riscv-virt-rt — board support for QEMU's RISC-V `virt` machine.
+--
+-- Form A (`mcpp = "*/mcpp.toml"`) rather than an inline Form B table, and the
+-- choice is load-bearing rather than stylistic: this package ships a
+-- `build.mcpp`, and mcpp looks for that at the PACKAGE ROOT. Form B leaves the
+-- root at the extract dir and absorbs the tarball's `riscv-virt-rt-<v>/` wrap
+-- layer inside each source glob — which would leave `build.mcpp` one level
+-- down, unfound, and the package would resolve, compile its module, and then
+-- link against nothing. Pointing at the manifest moves the root inside the
+-- wrap layer, where both the manifest and the program live.
+--
+-- ⚠️ `deps` is at the xpm PLATFORM level, not in the mcpp segment. The two
+-- entries are xim packages (an emulator and a target sysroot), not mcpp
+-- packages, so they travel on xim's install-time dependency edge. This matters
+-- more than it looks: mcpp materializes `[xlings] deps` for the ROOT project
+-- only, so a consumer that just runs `mcpp add riscv-virt-rt` would otherwise
+-- get the board package with neither a libc nor an emulator, and find out at
+-- build.mcpp time.
+package = {
+    spec        = "1",
+    namespace   = "mcpplibs",
+    name        = "riscv-virt-rt",
+    description = "Board support for QEMU's RISC-V virt machine — picolibc, startup, memory layout and the emulator",
+    licenses    = {"Apache-2.0"},
+    repo        = "https://github.com/mcpplibs/riscv-virt-rt",
+    type        = "package",
+
+    -- 0.2.0 adds the project template (`mcpp new <name> --template
+    -- riscv-virt-rt`); 0.1.0 stays listed because a version that has been
+    -- published is a version someone may have pinned.
+    xpm = {
+        linux = {
+            deps = { "xim:picolibc-riscv@1.8.12", "xim:qemu-riscv@9.2.4-1" },
+            ["0.1.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/riscv-virt-rt/archive/refs/tags/0.1.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/riscv-virt-rt/releases/download/0.1.0/riscv-virt-rt-0.1.0.tar.gz",
+                },
+                sha256 = "8afb5ff2e9593b59f1f90029f57d577df454c78cdeff80760894c72aac7e5168",
+            },
+            ["0.2.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/riscv-virt-rt/archive/refs/tags/0.2.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/riscv-virt-rt/releases/download/0.2.0/riscv-virt-rt-0.2.0.tar.gz",
+                },
+                sha256 = "79f1dc4415a59ba828048eb8706322957723f8a6fd84bde3faba6a377e48242b",
+            },
+        },
+        macosx = {
+            deps = { "xim:picolibc-riscv@1.8.12", "xim:qemu-riscv@9.2.4-1" },
+            ["0.1.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/riscv-virt-rt/archive/refs/tags/0.1.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/riscv-virt-rt/releases/download/0.1.0/riscv-virt-rt-0.1.0.tar.gz",
+                },
+                sha256 = "8afb5ff2e9593b59f1f90029f57d577df454c78cdeff80760894c72aac7e5168",
+            },
+            ["0.2.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/riscv-virt-rt/archive/refs/tags/0.2.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/riscv-virt-rt/releases/download/0.2.0/riscv-virt-rt-0.2.0.tar.gz",
+                },
+                sha256 = "79f1dc4415a59ba828048eb8706322957723f8a6fd84bde3faba6a377e48242b",
+            },
+        },
+        windows = {
+            deps = { "xim:picolibc-riscv@1.8.12", "xim:qemu-riscv@9.2.4-1" },
+            ["0.1.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/riscv-virt-rt/archive/refs/tags/0.1.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/riscv-virt-rt/releases/download/0.1.0/riscv-virt-rt-0.1.0.tar.gz",
+                },
+                sha256 = "8afb5ff2e9593b59f1f90029f57d577df454c78cdeff80760894c72aac7e5168",
+            },
+            ["0.2.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/riscv-virt-rt/archive/refs/tags/0.2.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/riscv-virt-rt/releases/download/0.2.0/riscv-virt-rt-0.2.0.tar.gz",
+                },
+                sha256 = "79f1dc4415a59ba828048eb8706322957723f8a6fd84bde3faba6a377e48242b",
+            },
+        },
+    },
+
+    -- The package's own manifest, inside the tarball's wrap directory.
+    mcpp = "*/mcpp.toml",
+}