libimagequant 2.12.1 (new formula)

Closes #28518.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/libimagequant.rb

@@ -0,0 +1,30 @@
+class Libimagequant < Formula
+  desc "Palette quantization library extracted from pnquant2"
+  homepage "https://pngquant.org/lib/"
+  url "https://github.com/ImageOptim/libimagequant/archive/2.12.1.tar.gz"
+  sha256 "7035eb281bc9a49cf36db8db807b713d03a0ffe8c5abfbb17a9ea8a038f21d5e"
+
+  def install
+    system "./configure", "--prefix=#{prefix}"
+    system "make", "install"
+  end
+
+  test do
+    (testpath/"test.c").write <<~EOS
+      #include <libimagequant.h>
+
+      int main()
+      {
+        liq_attr *attr = liq_attr_create();
+        if (!attr) {
+          return 1;
+        } else {
+          liq_attr_destroy(attr);
+          return 0;
+        }
+      }
+    EOS
+    system ENV.cc, "test.c", "-I#{include}", "-L#{lib}", "-limagequant", "-o", "test"
+    system "./test"
+  end
+end