diff --git a/src/external_libs.cmake b/src/external_libs.cmake
index 5a98540..1c5ab6d 100644
--- a/src/external_libs.cmake
+++ b/src/external_libs.cmake
@@ -1,7 +1,6 @@
 add_third_party(
   lua
-  GIT_REPOSITORY https://github.com/dragonflydb/lua
-  GIT_TAG Dragonfly-5.4.6a
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/lua/. <SOURCE_DIR>
   CONFIGURE_COMMAND echo
   BUILD_IN_SOURCE 1
   BUILD_COMMAND ${DFLY_TOOLS_MAKE} all
@@ -19,20 +18,16 @@ endif()
 
 add_third_party(
   dconv
-  GIT_REPOSITORY https://github.com/google/double-conversion
-  # URL https://github.com/google/double-conversion/archive/refs/tags/v3.3.1.tar.gz
-  GIT_TAG 0604b4c
-  PATCH_COMMAND ${SED_REPL} "/static const std::ctype/d"
-                <SOURCE_DIR>/double-conversion/string-to-double.cc
-  COMMAND ${SED_REPL} "/std::use_facet</d" <SOURCE_DIR>/double-conversion/string-to-double.cc
-  COMMAND ${SED_REPL} "s/cType.tolower/std::tolower/g" <SOURCE_DIR>/double-conversion/string-to-double.cc
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/dconv/. <SOURCE_DIR>
+  PATCH_COMMAND echo
+  CMAKE_PASS_FLAGS "-DCMAKE_POLICY_VERSION_MINIMUM=3.5"
   LIB libdouble-conversion.a
 )
 
 add_third_party(
   reflex
-  URL https://github.com/Genivia/RE-flex/archive/refs/tags/v5.2.2.tar.gz
-  PATCH_COMMAND autoreconf -fi
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/reflex/. <SOURCE_DIR>
+  PATCH_COMMAND echo
   CONFIGURE_COMMAND <SOURCE_DIR>/configure --disable-avx2 --prefix=${THIRD_PARTY_LIB_DIR}/reflex
           CXX=${CMAKE_CXX_COMPILER} CC=${CMAKE_C_COMPILER}
 )
@@ -41,16 +36,14 @@ set(REFLEX "${THIRD_PARTY_LIB_DIR}/reflex/bin/reflex")
 
 add_third_party(
   jsoncons
-  GIT_REPOSITORY https://github.com/dragonflydb/jsoncons
-  GIT_TAG Dragonfly1.5.0
-  GIT_SHALLOW 1
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/jsoncons/. <SOURCE_DIR>
   CMAKE_PASS_FLAGS "-DJSONCONS_BUILD_TESTS=OFF -DJSONCONS_HAS_POLYMORPHIC_ALLOCATOR=ON"
   LIB "none"
 )
 
 add_third_party(
   lz4
-  URL https://github.com/lz4/lz4/archive/refs/tags/v1.10.0.tar.gz
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/lz4/. <SOURCE_DIR>
 
   BUILD_IN_SOURCE 1
   CONFIGURE_COMMAND echo skip
@@ -65,7 +58,7 @@ set(MIMALLOC_C_FLAGS "-O3 -g -DMI_STAT=1 -DNDEBUG")
 file(MAKE_DIRECTORY ${MIMALLOC_INCLUDE_DIR})
 
 ExternalProject_Add(mimalloc2_project
-  URL https://github.com/microsoft/mimalloc/archive/refs/tags/v2.2.4.tar.gz
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/mimalloc224/. <SOURCE_DIR>
   DOWNLOAD_DIR ${THIRD_PARTY_DIR}/mimalloc2
   SOURCE_DIR ${THIRD_PARTY_DIR}/mimalloc2
   # INSTALL_DIR ${MIMALLOC_ROOT_DIR}
@@ -119,23 +112,21 @@ set_target_properties(TRDP::mimalloc2 PROPERTIES IMPORTED_LOCATION ${MIMALLOC_RO
 
 add_third_party(
   croncpp
-  URL https://github.com/mariusbancila/croncpp/archive/refs/tags/v2023.03.30.tar.gz
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/croncpp/. <SOURCE_DIR>
   LIB "none"
 )
 
 if (WITH_SEARCH)
   add_third_party(
     uni-algo
-    URL https://github.com/uni-algo/uni-algo/archive/refs/tags/v1.0.0.tar.gz
+    DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/uni-algo/. <SOURCE_DIR>
 
     CMAKE_PASS_FLAGS "-DCMAKE_CXX_STANDARD:STRING=20"
   )
 
   add_third_party(
     hnswlib
-    GIT_REPOSITORY https://github.com/dragonflydb/hnswlib.git
-    # HEAD of dragonfly branch
-    GIT_TAG d07dd1da2bf48b85d2f03b8396193ad7120f75c2
+    DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/hnswlib/. <SOURCE_DIR>
 
     BUILD_COMMAND echo SKIP
     INSTALL_COMMAND cp -R <SOURCE_DIR>/hnswlib ${THIRD_PARTY_LIB_DIR}/hnswlib/include/
@@ -145,7 +136,7 @@ if (WITH_SEARCH)
   # No autoconf/cmake/install in upstream Makefile; manual install copy.
   add_third_party(
     stemmer
-    URL https://github.com/snowballstem/snowball/archive/refs/tags/v3.0.1.tar.gz
+    DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/stemmer/. <SOURCE_DIR>
     BUILD_IN_SOURCE 1
     CONFIGURE_COMMAND echo skip
     BUILD_COMMAND ${DFLY_TOOLS_MAKE} -j4 CFLAGS=-O3\ -fPIC libstemmer.a
@@ -159,21 +150,20 @@ endif()
 
 add_third_party(
   fast_float
-  URL https://github.com/fastfloat/fast_float/archive/refs/tags/v5.2.0.tar.gz
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/fast_float/. <SOURCE_DIR>
   LIB "none"
 )
 
 add_third_party(
   flatbuffers
-  URL https://github.com/google/flatbuffers/archive/refs/tags/v23.5.26.tar.gz
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/flatbuffers/. <SOURCE_DIR>
   CMAKE_PASS_FLAGS "-DFLATBUFFERS_BUILD_TESTS=OFF -DFLATBUFFERS_LIBCXX_WITH_CLANG=OFF
                     -DFLATBUFFERS_BUILD_FLATC=OFF"
 )
 
 add_third_party(
   hdr_histogram
-  GIT_REPOSITORY https://github.com/HdrHistogram/HdrHistogram_c/
-  GIT_TAG 652d51bcc36744fd1a6debfeb1a8a5f58b14022c
+  DOWNLOAD_COMMAND cp -r ${CMAKE_BINARY_DIR}/deps-nixpkgs/hdr_histogram/. <SOURCE_DIR>
   CMAKE_PASS_FLAGS "-DHDR_LOG_REQUIRED=OFF -DHDR_HISTOGRAM_BUILD_PROGRAMS=OFF
                     -DHDR_HISTOGRAM_INSTALL_SHARED=OFF"
   LIB libhdr_histogram_static.a