diff --git a/projects/github.com/libass/libass/package.yml b/projects/github.com/libass/libass/package.yml
new file mode 100644
index 00000000..502e2765
--- /dev/null
+++ b/projects/github.com/libass/libass/package.yml
@@ -0,0 +1,43 @@
+distributable:
+  url: https://github.com/libass/libass/archive/refs/tags/{{version}}.tar.gz
+  strip-components: 1
+
+versions:
+  github: libass/libass/tags
+
+dependencies:
+  freetype.org: 2
+  gnu.org/fribidi: 1
+  harfbuzz.org: '*'
+  github.com/adah1972/libunibreak: '*'
+  linux:
+    freedesktop.org/fontconfig: 2
+  x86-64:
+    nasm.us: 2
+
+build:
+  dependencies:
+    tea.xyz/gx/cc: c99
+    tea.xyz/gx/make: '*'
+    gnu.org/autoconf: 2
+    gnu.org/automake: 1
+    gnu.org/libtool: 2
+    freedesktop.org/pkg-config: '*'
+  script: |
+    ./autogen.sh
+    ./configure $ARGS
+    make install
+  env:
+    ARGS:
+      - --disable-dependency-tracking
+      - --prefix={{prefix}}
+    darwin:
+      ARGS:
+      - --disable-fontconfig # libass uses coretext on macOS, fontconfig on Linux
+
+test:
+  dependencies:
+    tea.xyz/gx/cc: c99
+  script: |
+    c++ test.cpp -lass -o test
+    ./test
diff --git a/projects/github.com/libass/libass/test.cpp b/projects/github.com/libass/libass/test.cpp
new file mode 100644
index 00000000..f4d3eb0b
--- /dev/null
+++ b/projects/github.com/libass/libass/test.cpp
@@ -0,0 +1,20 @@
+#include "ass/ass.h"
+
+int main() {
+    ASS_Library *library;
+    ASS_Renderer *renderer;
+    library = ass_library_init();
+    if (library) {
+        renderer = ass_renderer_init(library);
+        if (renderer) {
+            ass_renderer_done(renderer);
+            ass_library_done(library);
+            return 0;
+        } else {
+            ass_library_done(library);
+            return 1;
+        }
+    } else {
+        return 1;
+    }
+}