diff --git a/makefile b/makefile
index b6865f3..c14f5ec 100644
--- a/makefile
+++ b/makefile
@@ -53,8 +53,8 @@ $(SRCDIR)/include/trousers/scoped_tss_type.h: extrasrc/scoped_tss_type.h | $(SRC
 	cp $< $@
 # Chromium includes <leveldb/memenv.h>.  This requires an install of libleveldb-dev that has
 # memenv support included; move this into a local leveldb/ subdirectory
-$(SRCDIR)/include/leveldb/memenv.h: /usr/include/leveldb/helpers/memenv.h | $(SRCDIR)/include/leveldb
-	cp $< $@
+$(SRCDIR)/include/leveldb/memenv.h: $(SRCDIR)/include/leveldb
+	cp @@NIXOS_LEVELDB@@/include/leveldb/helpers/memenv.h $@
 # Chromium includes <include/testing/gtest/include/gtest/gtest_prod.h>, so have a local copy.
 $(SRCDIR)/include/testing/gtest/include/gtest/gtest_prod.h: extrasrc/gtest_prod.h | $(SRCDIR)/include/testing/gtest/include/gtest
 	cp $< $@
@@ -80,7 +80,7 @@ GMOCK_DIR=$(SRCDIR)/gmock-$(GMOCK_VERSION)
 GTEST_DIR=$(GMOCK_DIR)/gtest
 src_gmock: $(GMOCK_DIR)/LICENSE
 $(GMOCK_DIR)/LICENSE: | $(SRCDIR)
-	cd $(SRCDIR) && wget $(GMOCK_URL)
+	cd $(SRCDIR) && cp @@NIXOS_SRC_GMOCK@@ gmock-$(GMOCK_VERSION).zip && chmod +w gmock-$(GMOCK_VERSION).zip
 	cd $(SRCDIR) && unzip -q gmock-$(GMOCK_VERSION).zip
 	rm $(SRCDIR)/gmock-$(GMOCK_VERSION).zip
 	touch $@
@@ -107,8 +107,7 @@ src_chromebase: $(SRCDIR)/base/base64.h
 $(SRCDIR)/base: | $(SRCDIR)
 	mkdir -p $@
 $(SRCDIR)/base/base64.h: | $(SRCDIR)/base
-	git clone $(CHROMEBASE_GIT) $(SRCDIR)/base
-	cd $(SRCDIR)/base && git checkout $(CHROMEBASE_COMMIT)
+	cp -r @@NIXOS_SRC_CHROMEBASE@@/. $(SRCDIR)/base && chmod -R +w $(SRCDIR)/base
 
 # We need two subdirectories from the platform2 repository from ChromiumOS:
 #   - chaps/ for the Chaps source code
@@ -119,14 +118,8 @@ $(SRCDIR)/platform2:
 PLATFORM2_GIT=https://chromium.googlesource.com/chromiumos/platform2
 PATCHES=$(wildcard $(CURDIR)/patches/platform2/*.patch)
 $(SRCDIR)/platform2/chaps/Makefile: | $(SRCDIR)/platform2
-	cd $(SRCDIR)/platform2 && git init . && git remote add -f origin $(PLATFORM2_GIT)
-	cd $(SRCDIR)/platform2 && git config core.sparsecheckout true
-	cd $(SRCDIR)/platform2 && echo "chaps" > .git/info/sparse-checkout
-	cd $(SRCDIR)/platform2 && echo "libchromeos/chromeos" >> .git/info/sparse-checkout
-	cd $(SRCDIR)/platform2 && echo "common-mk/common.mk" >> .git/info/sparse-checkout
-	cd $(SRCDIR)/platform2 && git pull origin master
-	cd $(SRCDIR)/platform2 && git checkout $(CROS_BRANCH)
-	cd $(SRCDIR)/platform2 && if [ ! -z "$(PATCHES)" ]; then git am $(PATCHES); fi
+	cd $(SRCDIR)/platform2 && cp -r @@NIXOS_SRC_PLATFORM2@@/. . && chmod -R +w $(SRCDIR)/platform2
+	cd $(SRCDIR)/platform2 && if [ ! -z "$(PATCHES)" ]; then patch -p1 < $(PATCHES); fi
 
 
 # Copy man pages