diff --git a/Make.inc b/Make.inc
index 81ff923..79e47f1 100644
--- a/Make.inc
+++ b/Make.inc
@@ -185,7 +185,7 @@ USE_GPL_LIBS ?= 1
 # Directories where said libraries get installed to
 prefix ?= $(BUILDROOT)/julia-$(JULIA_COMMIT)
 bindir := $(prefix)/bin
-libdir := $(prefix)/lib
+libdir := $(prefix)/GENTOOLIBDIR
 libexecdir := $(prefix)/libexec
 datarootdir := $(prefix)/share
 docdir := $(datarootdir)/doc/julia
@@ -417,7 +417,7 @@ ifneq ($(OS), WINNT)
 JCXXFLAGS += -pedantic
 endif
 DEBUGFLAGS := -O0 -ggdb2 -DJL_DEBUG_BUILD -fstack-protector-all
-SHIPFLAGS := -O3 -ggdb2 -falign-functions
+SHIPFLAGS := GENTOOCFLAGS
 endif
 
 ifeq ($(USECLANG),1)
@@ -428,7 +428,7 @@ JCFLAGS := -pipe $(fPIC) -fno-strict-aliasing -D_FILE_OFFSET_BITS=64
 JCPPFLAGS := -fasynchronous-unwind-tables
 JCXXFLAGS := -pipe $(fPIC) -fno-rtti -pedantic
 DEBUGFLAGS := -O0 -g -DJL_DEBUG_BUILD -fstack-protector-all
-SHIPFLAGS := -O3 -g
+SHIPFLAGS := GENTOOCFLAGS
 ifeq ($(OS), Darwin)
 ifeq ($(USE_LIBCPP), 1)
 MACOSX_VERSION_MIN := 10.8
@@ -457,7 +457,7 @@ JCFLAGS := -std=gnu11 -pipe $(fPIC) -fno-strict-aliasing -D_FILE_OFFSET_BITS=64
 JCPPFLAGS :=
 JCXXFLAGS := -pipe $(fPIC) -fno-rtti
 DEBUGFLAGS := -O0 -g -DJL_DEBUG_BUILD -fstack-protector-all
-SHIPFLAGS := -O3 -g -falign-functions
+SHIPFLAGS := GENTOOCFLAGS
 endif
 
 ifeq ($(USECCACHE), 1)
diff --git a/doc/Makefile b/doc/Makefile
index 99e60ee..2027fb5 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -30,7 +30,7 @@ deps: UnicodeData.txt
 	$(JLCHECKSUM) UnicodeData.txt
 
 clean:
-	-rm -rf _build/* deps/* docbuild.log UnicodeData.txt
+	@echo "Do not clean doc/_build/html. Just use it..."
 
 cleanall: clean