add patch for libiconv

packages/l/libiconv/xmake.lua

@@ -7,6 +7,11 @@ package("libiconv")
              "https://ftpmirror.gnu.org/libiconv/libiconv-$(version).tar.gz")
     add_versions("1.15", "ccf536620a45458d26ba83887a983b96827001e92a13847b45e4925cc8913178")
 
+    if is_plat("macosx") then
+        add_patches("1.15", "https://raw.githubusercontent.com/Homebrew/patches/9be2793af/libiconv/patch-utf8mac.diff",
+                            "e8128732f22f63b5c656659786d2cf76f1450008f36bcf541285268c66cabeab")
+    end
+
     on_load(function (package)
         package:addenv("PATH", "bin")
     end)
@@ -18,6 +23,7 @@ package("libiconv")
         else
             table.insert(configs, "--disable-debug")
         end
+        os.vrunv("make", {"-f", "Makefile.devel", "CFLAGS=" .. (package:config("cflags") or "")})
         import("package.tools.autoconf").install(package, configs)
     end)
 
@@ -25,3 +31,4 @@ package("libiconv")
         os.vrun("iconv --version")
         assert(package:has_cfuncs("iconv_open", {includes = "iconv.h"}))
     end)
+