diff --git a/pkgs/by-name/je/jerryscript/fix-gcc15.patch b/pkgs/by-name/je/jerryscript/fix-gcc15.patch
new file mode 100644
index 000000000000..7ba30a141f23
--- /dev/null
+++ b/pkgs/by-name/je/jerryscript/fix-gcc15.patch
@@ -0,0 +1,19 @@
+diff --git a/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c b/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
+index 280a94c..b147679 100644
+--- a/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
++++ b/jerry-core/ecma/builtin-objects/ecma-builtin-helpers-date.c
+@@ -36,12 +36,12 @@
+ /**
+  * Day names
+  */
+-const char day_names_p[7][3] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
++const char day_names_p[7][3] __attribute__((nonstring)) = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+ 
+ /**
+  * Month names
+  */
+-const char month_names_p[12][3] = {
++const char month_names_p[12][3] __attribute__((nonstring)) = {
+   "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+ };
+ 
diff --git a/pkgs/by-name/je/jerryscript/package.nix b/pkgs/by-name/je/jerryscript/package.nix
index 300a6618fcd4..0dcec30c9627 100644
--- a/pkgs/by-name/je/jerryscript/package.nix
+++ b/pkgs/by-name/je/jerryscript/package.nix
@@ -30,6 +30,16 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-Evu4qLlwg3Sf9w/ojtZMNxGJEtopHgKnwqlpf115zD4=";
   };
 
+  patches = [
+    # https://github.com/jerryscript-project/jerryscript/issues/5263
+    ./fix-gcc15.patch
+  ];
+
+  postPatch = ''
+    # get rid of bundled CMake toolchain files
+    rm cmake/toolchain_*
+  '';
+
   nativeBuildInputs = [
     cmake
     ninja
@@ -41,6 +51,8 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.cmakeBool "BUILD_SHARED_LIBS" (!stdenv.hostPlatform.isStatic))
   ];
 
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-enum-enum-conversion -Wno-enum-float-conversion -Wno-literal-range";
+
   nativeCheckInputs = [
     python3
   ];
@@ -57,8 +69,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   # Uses a custom lib variable that ignores what nixpkgs's cmake setupHook specifies.
   postInstall = ''
-    mkdir -p "$lib/lib"
-    mv "$out/lib/"*.so "$lib/lib"
+    mkdir $lib
+    mv "$out/lib" "$lib/"
   '';
 
   nativeInstallCheckInputs = [
@@ -92,6 +104,9 @@ stdenv.mkDerivation (finalAttrs: {
       "libjerry-ext"
       "libjerry-port"
     ];
-    maintainers = with lib.maintainers; [ RossSmyth ];
+    maintainers = with lib.maintainers; [
+      RossSmyth
+      wishstudio
+    ];
   };
 })