diff --git a/pkgs/by-name/qm/qmapshack/dont_fetch_dependencies.patch b/pkgs/by-name/qm/qmapshack/dont_fetch_dependencies.patch
new file mode 100644
index 000000000000..58e7554b5f63
--- /dev/null
+++ b/pkgs/by-name/qm/qmapshack/dont_fetch_dependencies.patch
@@ -0,0 +1,49 @@
+diff --git i/CMakeLists.txt w/CMakeLists.txt
+index 33ec4e4a..9dff47cb 100644
+--- i/CMakeLists.txt
++++ w/CMakeLists.txt
+@@ -232,7 +232,6 @@ include(FetchContent)
+ ###############################################################################################
+ # Both are cloned by FetchContent. Fail here with a clear message instead of deep inside the
+ # populate sub-build if git is not on the PATH. Set GIT_EXECUTABLE if it is elsewhere.
+-find_package(Git REQUIRED)
+ 
+ # asmjit does not do official releases so pinned it to what was HEAD at time of writing this
+ set(ASMJIT_GIT_TAG  "0bd5787b54b575ed94bf32ac452153b34385c514" CACHE STRING "AsmJit git revision to fetch")
+@@ -243,34 +242,14 @@ set(BLEND2D_GIT_TAG "def0d1238c3e5d0983bb848e5676049d829e435b" CACHE STRING "Ble
+ # directory with no CMakeLists.txt so FetchContent_MakeAvailable populates without calling
+ # add_subdirectory(). Blend2D adds asmjit itself (via ASMJIT_DIR) and, because we build it
+ # statically, embeds it directly into the blend2d library.
+-FetchContent_Declare(asmjit
+-    GIT_REPOSITORY https://github.com/asmjit/asmjit.git
+-    GIT_TAG        ${ASMJIT_GIT_TAG}
+-    GIT_SHALLOW    FALSE # FALSE required when using a commit hash
+-    GIT_PROGRESS TRUE
+-    SOURCE_SUBDIR  __populate_only__
+-)
+-FetchContent_MakeAvailable(asmjit)
+-set(ASMJIT_DIR "${asmjit_SOURCE_DIR}" CACHE PATH "AsmJit source directory" FORCE)
++find_package(asmjit REQUIRED)
+ 
+-set(BLEND2D_STATIC TRUE)
+-FetchContent_Declare(blend2d
+-    GIT_REPOSITORY https://github.com/blend2d/blend2d.git
+-    GIT_TAG        ${BLEND2D_GIT_TAG}
+-    GIT_SHALLOW    FALSE
+-    GIT_PROGRESS TRUE
+-)
+-FetchContent_MakeAvailable(blend2d)
++find_package(blend2d REQUIRED)
+ 
+ # Blend2D's public headers use constructs our warning flags reject (anonymous structs vs
+ # -Wpedantic, ...). Re-publish its interface include dirs as system to supress any warnings.
+ # Once we bump our minimum cmake version to >= 3.25 we can instead just declare it `SYSTEM`
+ # in the `FetchContent_Declare` call and get rid of this.
+-get_target_property(BLEND2D_IFACE_INCLUDE_DIRS blend2d INTERFACE_INCLUDE_DIRECTORIES)
+-if(BLEND2D_IFACE_INCLUDE_DIRS)
+-    set_target_properties(blend2d PROPERTIES
+-        INTERFACE_SYSTEM_INCLUDE_DIRECTORIES "${BLEND2D_IFACE_INCLUDE_DIRS}")
+-endif()
+ 
+ ###############################################################################################
+ # Create library from Garmin's FIT SDK
diff --git a/pkgs/by-name/qm/qmapshack/package.nix b/pkgs/by-name/qm/qmapshack/package.nix
index 8c5ce410b4eb..845ac4c4514a 100644
--- a/pkgs/by-name/qm/qmapshack/package.nix
+++ b/pkgs/by-name/qm/qmapshack/package.nix
@@ -6,6 +6,8 @@
   qt6,
   qt6Packages,
   alglib,
+  asmjit,
+  blend2d,
   gdal,
   proj,
   routino,
@@ -13,15 +15,17 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "qmapshack";
-  version = "1.20.3";
+  version = "1.21.0";
 
   src = fetchFromGitHub {
     owner = "Maproom";
     repo = "qmapshack";
     tag = "V_${finalAttrs.version}";
-    hash = "sha256-U9sOIcQKE9v5vXsfvloLbfxtrCNliJEYnbc1mlwk9bo=";
+    hash = "sha256-8GQT83CqNBWJlWkiVDOgLEXkw1kohCCIKfS3TP9NFFs=";
   };
 
+  patches = [ ./dont_fetch_dependencies.patch ];
+
   nativeBuildInputs = [
     cmake
     qt6.qttools
@@ -30,6 +34,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   buildInputs = [
     alglib
+    asmjit
+    blend2d
     gdal
     proj
     routino