diff --git a/.travis.yml b/.travis.yml
index 76e3af05d55..17a7543ef22 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@ install:
   - sudo apt-get update -qq
   - sudo apt-get install -qq --force-yes -y llvm-$LLVM_VERSION
     llvm-${LLVM_VERSION}-dev clang-$LLVM_VERSION lldb-$LLVM_VERSION
+    libjemalloc-dev
 
 
 # All of the llvm tools are suffixed with "-$VERS" which we don't want, so
@@ -27,7 +28,8 @@ before_script:
   - ln -nsf /usr/bin/llvm-dis-$LLVM_VERSION local-llvm/bin/llvm-dis
   - ln -nsf /usr/bin/llc-$LLVM_VERSION local-llvm/bin/llc
   - ln -nsf /usr/include/llvm-$LLVM_VERSION local-llvm/include
-  - ./configure --disable-optimize-tests --llvm-root=`pwd`/local-llvm --enable-fast-make --enable-clang
+  - ./configure --disable-optimize-tests --llvm-root=`pwd`/local-llvm
+    --enable-fast-make --enable-clang --jemalloc-root=/usr/lib
 
 # Tidy everything up first, then build a few things, and then run a few tests.
 # Note that this is meant to run in a "fairly small" amount of time, so this
diff --git a/configure b/configure
index e3cf990d47c..fe29e488316 100755
--- a/configure
+++ b/configure
@@ -425,6 +425,8 @@ opt verify-install 1 "verify installed binaries work"
 valopt prefix "/usr/local" "set installation prefix"
 valopt local-rust-root "/usr/local" "set prefix for local rust binary"
 valopt llvm-root "" "set LLVM root"
+valopt jemalloc-root "" "set directory where libjemalloc_pic.a is located"
+valopt libuv-root "" "set directory where libuv.a is located"
 valopt android-cross-path "/opt/ndk_standalone" "Android NDK standalone path"
 valopt mingw32-cross-path "" "MinGW32 cross compiler path"
 
@@ -1198,6 +1200,8 @@ putvar CFG_ANDROID_CROSS_PATH
 putvar CFG_MINGW32_CROSS_PATH
 putvar CFG_MANDIR
 putvar CFG_DISABLE_INJECT_STD_VERSION
+putvar CFG_JEMALLOC_ROOT
+putvar CFG_LIBUV_ROOT
 
 # Avoid spurious warnings from clang by feeding it original source on
 # ccache-miss rather than preprocessed input.
diff --git a/mk/rt.mk b/mk/rt.mk
index a75cb8aa4de..1c4efd641f0 100644
--- a/mk/rt.mk
+++ b/mk/rt.mk
@@ -204,19 +204,17 @@ $$(LIBUV_MAKEFILE_$(1)): $$(LIBUV_DEPS) $$(MKFILE_DEPS) $$(LIBUV_STAMP_$(1))
 # theory when we support msvc then we should be using gyp's msvc output instead
 # of mingw's makefile for windows
 ifdef CFG_WINDOWSY_$(1)
-$$(LIBUV_LIB_$(1)): $$(LIBUV_DEPS) $$(MKFILE_DEPS)
+LIBUV_LOCAL_$(1) := $$(S)src/libuv/libuv.a
+$$(LIBUV_LOCAL_$(1)): $$(LIBUV_DEPS) $$(MKFILE_DEPS)
 	$$(Q)$$(MAKE) -C $$(S)src/libuv -f Makefile.mingw \
 		LDFLAGS="$$(CFG_GCCISH_LINK_FLAGS_$(1))" \
 		CC="$$(CC_$(1)) $$(LIBUV_CFLAGS_$(1)) $$(SNAP_DEFINES)" \
 		CXX="$$(CXX_$(1))" \
 		AR="$$(AR_$(1))" \
 		V=$$(VERBOSE)
-	$$(Q)cp $$(S)src/libuv/libuv.a $$@
 else
-$$(LIBUV_LIB_$(1)): $$(LIBUV_DIR_$(1))/Release/libuv.a $$(MKFILE_DEPS)
-	$$(Q)cp $$< $$@
-$$(LIBUV_DIR_$(1))/Release/libuv.a: $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1)) \
-				    $$(MKFILE_DEPS)
+LIBUV_LOCAL_$(1) := $$(LIBUV_DIR_$(1))/Release/libuv.a
+$$(LIBUV_LOCAL_$(1)): $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1)) $$(MKFILE_DEPS)
 	$$(Q)$$(MAKE) -C $$(LIBUV_DIR_$(1)) \
 		CFLAGS="$$(LIBUV_CFLAGS_$(1)) $$(SNAP_DEFINES)" \
 		LDFLAGS="$$(CFG_GCCISH_LINK_FLAGS_$(1))" \
@@ -231,6 +229,19 @@ $$(LIBUV_DIR_$(1))/Release/libuv.a: $$(LIBUV_DEPS) $$(LIBUV_MAKEFILE_$(1)) \
 
 endif
 
+ifeq ($(1),$$(CFG_BUILD))
+ifneq ($$(CFG_LIBUV_ROOT),)
+$$(LIBUV_LIB_$(1)): $$(CFG_LIBUV_ROOT)/libuv.a
+	$$(Q)cp $$< $$@
+else
+$$(LIBUV_LIB_$(1)): $$(LIBUV_LOCAL_$(1))
+	$$(Q)cp $$< $$@
+endif
+else
+$$(LIBUV_LIB_$(1)): $$(LIBUV_LOCAL_$(1))
+	$$(Q)cp $$< $$@
+endif
+
 ################################################################################
 # jemalloc
 ################################################################################
@@ -253,8 +264,9 @@ else
 endif
 JEMALLOC_LIB_$(1) := $$(RT_OUTPUT_DIR_$(1))/$$(JEMALLOC_NAME_$(1))
 JEMALLOC_BUILD_DIR_$(1) := $$(RT_OUTPUT_DIR_$(1))/jemalloc
+JEMALLOC_LOCAL_$(1) := $$(JEMALLOC_BUILD_DIR_$(1))/lib/$$(JEMALLOC_REAL_NAME_$(1))
 
-$$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_DEPS) $$(MKFILE_DEPS)
+$$(JEMALLOC_LOCAL_$(1)): $$(JEMALLOC_DEPS) $$(MKFILE_DEPS)
 	@$$(call E, make: jemalloc)
 	cd "$$(JEMALLOC_BUILD_DIR_$(1))"; "$(S)src/jemalloc/configure" \
 		$$(JEMALLOC_ARGS_$(1)) --enable-cc-silence --with-jemalloc-prefix=je_ \
@@ -265,7 +277,20 @@ $$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_DEPS) $$(MKFILE_DEPS)
 		CPPFLAGS="-I $(S)src/rt/" \
 		EXTRA_CFLAGS="$$(CFG_CFLAGS_$(1)) -g1"
 	$$(Q)$$(MAKE) -C "$$(JEMALLOC_BUILD_DIR_$(1))" build_lib_static
-	$$(Q)cp $$(JEMALLOC_BUILD_DIR_$(1))/lib/$$(JEMALLOC_REAL_NAME_$(1)) $$(JEMALLOC_LIB_$(1))
+
+ifeq ($(1),$$(CFG_BUILD))
+ifneq ($$(CFG_JEMALLOC_ROOT),)
+$$(JEMALLOC_LIB_$(1)): $$(CFG_JEMALLOC_ROOT)/libjemalloc_pic.a
+	@$$(call E, copy: jemalloc)
+	$$(Q)cp $$< $$@
+else
+$$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_LOCAL_$(1))
+	$$(Q)cp $$< $$@
+endif
+else
+$$(JEMALLOC_LIB_$(1)): $$(JEMALLOC_LOCAL_$(1))
+	$$(Q)cp $$< $$@
+endif
 
 ################################################################################
 # compiler-rt