diff --git a/projects/jpeg.org/jpegxl/fixture.jpeg b/projects/jpeg.org/jpegxl/fixture.jpeg
new file mode 100644
index 00000000..9a717a0d
Binary files /dev/null and b/projects/jpeg.org/jpegxl/fixture.jpeg differ
diff --git a/projects/jpeg.org/jpegxl/fixture1.c b/projects/jpeg.org/jpegxl/fixture1.c
new file mode 100644
index 00000000..3e48d2f6
--- /dev/null
+++ b/projects/jpeg.org/jpegxl/fixture1.c
@@ -0,0 +1,11 @@
+#include <jxl/encode.h>
+#include <stdlib.h>
+
+int main() {
+  JxlEncoder* enc = JxlEncoderCreate(NULL);
+  if (enc == NULL) {
+    return EXIT_FAILURE;
+  }
+  JxlEncoderDestroy(enc);
+  return EXIT_SUCCESS;
+}
diff --git a/projects/jpeg.org/jpegxl/fixture2.c b/projects/jpeg.org/jpegxl/fixture2.c
new file mode 100644
index 00000000..9e8c7311
--- /dev/null
+++ b/projects/jpeg.org/jpegxl/fixture2.c
@@ -0,0 +1,11 @@
+#include <jxl/thread_parallel_runner.h>
+#include <stdlib.h>
+
+int main() {
+  void* runner = JxlThreadParallelRunnerCreate(NULL, 1);
+  if (runner == NULL) {
+    return EXIT_FAILURE;
+  }
+  JxlThreadParallelRunnerDestroy(runner);
+  return EXIT_SUCCESS;
+}
diff --git a/projects/jpeg.org/jpegxl/package.yml b/projects/jpeg.org/jpegxl/package.yml
new file mode 100644
index 00000000..6ef76240
--- /dev/null
+++ b/projects/jpeg.org/jpegxl/package.yml
@@ -0,0 +1,63 @@
+distributable:
+  url: https://github.com/libjxl/libjxl/archive/v{{version}}.tar.gz
+  strip-components: 1
+
+versions:
+  github: libjxl/libjxl
+
+dependencies:
+  github.com/google/brotli: ^1
+  littlecms.com: ^2.13
+  google.com/highway: ^1
+  google.com/webp: ^1
+  giflib.sourceforge.io: ^5
+  openexr.com: ^3
+
+provides:
+  - bin/cjpeg_hdr
+  - bin/cjxl
+  - bin/djxl
+  - bin/jxlinfo
+
+build:
+  dependencies:
+    tea.xyz/gx/cc: c99
+    tea.xyz/gx/make: '*'
+    freedesktop.org/pkg-config: ^0.29
+    cmake.org: ^3
+    gnu.org/coreutils: '*'  # deps.sh needs “realpath”
+  working-directory: build
+  script: |
+    GIT_DIR=$PWD ../deps.sh  # †
+    find ../third_party -not -name sjpeg -mindepth 1 -maxdepth 1 -type d | xargs rm -rf  # ‡
+
+    cmake .. $ARGS
+    make --jobs {{ hw.concurrency }} install
+  env:
+    # add any environment variables here
+    ARGS:
+      - -DCMAKE_BUILD_TYPE=Release
+      - -DCMAKE_INSTALL_PREFIX={{prefix}}
+      - -DBUILD_TESTING=OFF
+      - -DJPEGXL_ENABLE_SKCMS=OFF
+      - -DJPEGXL_ENABLE_BENCHMARK=OFF
+      - -DJPEGXL_VERSION={{version}}
+
+# † we set GIT_DIR because the script assumes git if it finds git rev-parse
+# works, which it does for us because we have a git checkout both locally and
+# in CI/CD
+
+# ‡ we don’t want anything but sjpeg which is a super rare dep only used by
+# this package
+
+test:
+  dependencies:
+    tea.xyz/gx/cc: c99
+  script: |
+    cjxl fixture.jpeg out.jxl
+
+    cc fixture1.c -ljxl
+    ./a.out
+
+    cc fixture2.c -ljxl_threads
+    ./a.out
diff --git a/projects/littlecms.com/package.yml b/projects/littlecms.com/package.yml
index 92787f27..4717840b 100644
--- a/projects/littlecms.com/package.yml
+++ b/projects/littlecms.com/package.yml
@@ -4,8 +4,8 @@ distributable:
    strip-components: 1
 
 versions:
-  github: mm2/Little-CMS/tags  # reads github tags from github
-  strip: /^Little CMS /
+  github: mm2/Little-CMS/releases/tags
+  strip: /^lcms/
 
 dependencies:
   simplesystems.org/libtiff: ^4
@@ -17,7 +17,7 @@ build:
     tea.xyz/gx/make: '*'
   script: |
     ./configure $ARGS
-    make --jobs {{ hw.concurrency }} 
+    make --jobs {{ hw.concurrency }}
     make install
   env:
     ARGS: