diff --git a/cmake_modules/tk_macosx.patch b/cmake_modules/tk_macosx.patch
new file mode 100644
index 00000000..fbfcd1df
--- /dev/null
+++ b/cmake_modules/tk_macosx.patch
@@ -0,0 +1,58 @@
+diff --git a/macosx/GNUmakefile b/macosx/GNUmakefile
+index 02240ed..aac1d4c 100644
+--- a/macosx/GNUmakefile
++++ b/macosx/GNUmakefile
+@@ -133,9 +133,7 @@ override EMBEDDED_BUILD :=
+ endif
+ 
+ INSTALL_TARGETS		= install-binaries install-libraries
+-ifeq (${EMBEDDED_BUILD},)
+ INSTALL_TARGETS		+= install-private-headers install-headers install-demos
+-endif
+ ifeq (${INSTALL_BUILD}_${EMBEDDED_BUILD}_${BUILD_STYLE},1__Deployment)
+ INSTALL_TARGETS		+= html-tk
+ ifneq (${INSTALL_MANPAGES},)
+@@ -253,43 +251,6 @@ ifeq (${BUILD_STYLE}_${EMBEDDED_BUILD},Development_)
+ 	@cd "${INSTALL_ROOT}${LIBDIR}/${PRODUCT_NAME}.framework/Versions/${VERSION}" && \
+ 	ln -f "${PRODUCT_NAME}" "${PRODUCT_NAME}_debug"
+ endif
+-ifeq (${TK_X11},)
+-ifeq (${EMBEDDED_BUILD},)
+-# install Wish.app link in APPLICATION_INSTALL_PATH and setup 'Wish Shell' compatibility links
+-	@cd "${TOP_DIR}" && if [ -n "${APP_DIR}" ]; then mkdir -p "./${APP_DIR}" && rm -rf "./${APP_DIR}/Wish.app" && \
+-	ln -fsh "./$$(echo "${APP_DIR}" | sed -e 's#/[^/][^/]*#/..#g')/${FMWK_DIR}/${PRODUCT_NAME}.framework/Resources/Wish.app" "./${APP_DIR}" && \
+-	ln -fsh Wish.app "./${APP_DIR}/Wish Shell.app"; fi && \
+-	ln -fsh Wish.app "./${TK_FMWK_DIR}/Resources/Wish Shell.app" && \
+-	ln -fsh Wish "./${TK_FMWK_DIR}/Resources/Wish.app/Contents/MacOS/Wish Shell"
+-else
+-# if we are embedding frameworks, move them into the app and fix their install names
+-	@cd "${TOP_DIR}" && \
+-	rm -rf "./${APP_DIR}/Wish.app" && mkdir -p "./${APP_DIR}" && \
+-	mv -f "./${TK_FMWK_DIR}/Resources/Wish.app" "./${APP_DIR}" && \
+-	ln -fsh Wish.app "./${APP_DIR}/Wish Shell.app" && \
+-	rm -rf "./${APP_DIR}/Wish.app/Contents/Frameworks" && \
+-	mkdir -p "./${APP_DIR}/Wish.app/Contents/Frameworks" && \
+-	${CPPROG} -RH "./${FMWK_DIR}"/T{cl,k}.framework "./${APP_DIR}/Wish.app/Contents/Frameworks" && \
+-	cd "./${APP_DIR}/Wish.app/Contents" && \
+-	rm -rf Frameworks/Tcl.framework/{,/Versions/${TCL_VERSION}}/{Headers,PrivateHeaders,*_debug,lib*.a,*Config.sh} && \
+-	rm -rf Frameworks/Tk.framework/{,/Versions/${VERSION}}/{Headers,PrivateHeaders,*_debug,lib*.a,*Config.sh} && \
+-	fix_install_id ( ) { \
+-	    chmod -RH a+w "$$1"; \
+-	    install_name_tool -id $$(otool -L "$$1" | awk "/$$2\.framework.*[^:]\$$/ {sub(\"^.*/Frameworks\",\"@executable_path/../Frameworks\",\$$1); print \$$1}") "$$1"; \
+-	    chmod -RH a-w "$$1"; \
+-	} && \
+-	fix_install_name ( ) { \
+-	    chmod -RH a+w "$$1"; \
+-	    install_name_tool -change $$(otool -L "$$1" | awk "/$$2\.framework.*[^:]\$$/ {print \$$1; sub(\"^.*/Frameworks\",\"@executable_path/../Frameworks\",\$$1); print \$$1}") "$$1"; \
+-	    chmod -RH a-w "$$1"; \
+-	} && \
+-	fix_install_id Frameworks/Tcl.framework/Tcl Tcl && fix_install_id Frameworks/Tk.framework/Tk Tk && \
+-	fix_install_name MacOS/Wish Tcl && fix_install_name MacOS/Wish Tk
+-ifeq (${INSTALL_BUILD},1)
+-	@cd "${TOP_DIR}" && rm -rf "./${FMWK_DIR}"/T{cl,k}.framework && rmdir -p "./${FMWK_DIR}" 2>&- || true
+-endif
+-endif
+-endif
+ 
+ clean-${PROJECT}: %-${PROJECT}:
+ 	${DO_MAKE}
diff --git a/external_dependencies/.gitignore b/external_dependencies/.gitignore
new file mode 100644
index 00000000..335ec957
--- /dev/null
+++ b/external_dependencies/.gitignore
@@ -0,0 +1 @@
+*.tar.gz