diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..4f00cbc
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "common/tcl"]
+	path = win/tcl
+	url = https://github.com/tcltk/tcl.git
+[submodule "common/tk"]
+	path = win/tk
+	url = https://github.com/tcltk/tk.git
+[submodule "common/zlib"]
+	path = win/zlib
+	url = https://github.com/madler/zlib.git
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..29f72c5
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# NGSolve dependencies
+
+Repository to build following dependencies for NGSolve on Windows
+- zlib
+- TCL/TK
+
+Also contains binaries in the github release section for
+- OpenCascade (including minGW runtimes)
+- OpenBLAS
diff --git a/win/CMakeLists.txt b/win/CMakeLists.txt
new file mode 100644
index 0000000..57de960
--- /dev/null
+++ b/win/CMakeLists.txt
@@ -0,0 +1,66 @@
+cmake_minimum_required(VERSION 3.5)
+
+include(ExternalProject)
+
+project(ExternalLibs)
+
+enable_language(C)
+
+find_program(NMAKE nmake)
+
+set(INSTALL_DIR ${CMAKE_CURRENT_BINARY_DIR}/install)
+set(TCLTK_INSTALL_DIR ${INSTALL_DIR}/tcltk)
+set(ZLIB_INSTALL_DIR ${INSTALL_DIR}/zlib)
+
+file(GLOB TCL_INT_HEADERS
+	${CMAKE_CURRENT_SOURCE_DIR}/tcl/*/tcl*Int*.h
+	${CMAKE_CURRENT_SOURCE_DIR}/tcl/*/tcl*Port*.h
+)
+file(GLOB TK_INT_HEADERS
+	${CMAKE_CURRENT_SOURCE_DIR}/tk/*/tk*Int*.h
+	${CMAKE_CURRENT_SOURCE_DIR}/tk/*/tk*Port*.h
+	${CMAKE_CURRENT_SOURCE_DIR}/tk/win/tkWin.h
+)
+
+ExternalProject_Add(tcl_project
+	SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/tcl/win
+	BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/tcl/win
+	CONFIGURE_COMMAND ""
+	BUILD_COMMAND ${NMAKE} -f makefile.vc INSTALLDIR=${TCLTK_INSTALL_DIR}
+	INSTALL_COMMAND ${NMAKE} -f makefile.vc install INSTALLDIR=${TCLTK_INSTALL_DIR}
+	COMMAND ${CMAKE_COMMAND} -E copy ${TCL_INT_HEADERS} ${TCLTK_INSTALL_DIR}/include/
+)
+
+ExternalProject_Add(tk_project
+	DEPENDS tcl_project
+	SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/tk/win
+	BINARY_DIR ${CMAKE_CURRENT_SOURCE_DIR}/tk/win
+	CONFIGURE_COMMAND ""
+	BUILD_COMMAND ${NMAKE} -f makefile.vc INSTALLDIR=${TCLTK_INSTALL_DIR} TCLDIR=${CMAKE_CURRENT_SOURCE_DIR}/tcl
+	INSTALL_COMMAND ${NMAKE} -f makefile.vc install INSTALLDIR=${TCLTK_INSTALL_DIR} TCLDIR=${CMAKE_CURRENT_SOURCE_DIR}/tcl
+	COMMAND ${CMAKE_COMMAND} -E copy ${TK_INT_HEADERS} ${TCLTK_INSTALL_DIR}/include/
+)
+
+add_custom_target(zip_tcltk ALL
+	DEPENDS tk_project
+	COMMAND ${CMAKE_COMMAND} -E tar "cfv"
+	"${CMAKE_INSTALL_PREFIX}/tcltk_win64.zip" --format=zip
+	bin include lib
+	WORKING_DIRECTORY ${TCLTK_INSTALL_DIR}
+)
+
+ExternalProject_Add(zlib_project
+	SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/zlib
+	BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR}/zlib
+	CMAKE_GENERATOR ${CMAKE_GENERATOR}
+	CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${ZLIB_INSTALL_DIR}
+)
+
+add_custom_target(zip_zlib ALL
+	DEPENDS zlib_project
+	COMMAND ${CMAKE_COMMAND} -E tar "cfv"
+	"${CMAKE_INSTALL_PREFIX}/zlib_win64.zip" --format=zip
+	bin include lib
+	WORKING_DIRECTORY ${ZLIB_INSTALL_DIR}
+)
+
diff --git a/win/build.bat b/win/build.bat
new file mode 100644
index 0000000..e6a24ab
--- /dev/null
+++ b/win/build.bat
@@ -0,0 +1,7 @@
+cmake -E make_directory build
+cmake -E make_directory packages
+cd build
+call "%VS140COMNTOOLS%\..\..\VC\vcvarsall" x64
+cmake ..  -DCMAKE_INSTALL_PREFIX=..\packages -G "Visual Studio 14 2015 Win64"
+cmake --build . --config Release
+PAUSE
diff --git a/win/tcl b/win/tcl
new file mode 160000
index 0000000..443f0a7
--- /dev/null
+++ b/win/tcl
@@ -0,0 +1 @@
+Subproject commit 443f0a7ceffa45b9f450afea22b701c44f84b87b
diff --git a/win/tk b/win/tk
new file mode 160000
index 0000000..d34d76d
--- /dev/null
+++ b/win/tk
@@ -0,0 +1 @@
+Subproject commit d34d76dd0d9c0144e573d9e194655a56e56d32be
diff --git a/win/zlib b/win/zlib
new file mode 160000
index 0000000..cacf7f1
--- /dev/null
+++ b/win/zlib
@@ -0,0 +1 @@
+Subproject commit cacf7f1d4e3d44d871b605da3b647f07d718623f