diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index 0a2c8b69ddd..a3961efe1b5 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -838,6 +838,13 @@ AC_ARG_WITH(gcc-toolchain,
 AC_DEFINE_UNQUOTED(GCC_INSTALL_PREFIX,"$withval",
                    [Directory where gcc is installed.])
 
+AC_ARG_WITH(sysroot,
+  AS_HELP_STRING([--with-default-sysroot],
+    [Add --sysroot=<path> to all compiler invocations.]),,
+    withval="")
+AC_DEFINE_UNQUOTED(DEFAULT_SYSROOT,"$withval",
+                   [Default <path> to all compiler invocations for --sysroot=<path>.])
+
 dnl Allow linking of LLVM with GPLv3 binutils code.
 AC_ARG_WITH(binutils-include,
   AS_HELP_STRING([--with-binutils-include],
diff --git a/configure b/configure
index e87160d75c4..df462a923a5 100755
--- a/configure
+++ b/configure
@@ -1442,6 +1442,7 @@ Optional Packages:
   --with-c-include-dirs   Colon separated list of directories clang will
                           search for headers
   --with-gcc-toolchain    Directory where gcc is installed.
+  --with-default-sysroot  Add --sysroot=<path> to all compiler invocations.
   --with-binutils-include Specify path to binutils/include/ containing
                           plugin-api.h file for gold plugin.
   --with-bug-report-url   Specify the URL where bug reports should be
@@ -3802,7 +3803,7 @@ else
     llvm_cv_target_os_type="Darwin" ;;
   *-*-minix*)
     llvm_cv_target_os_type="Minix" ;;
-  *-*-freebsd*| *-*-kfreebsd-gnu)
+  *-*-freebsd* | *-*-kfreebsd-gnu)
     llvm_cv_target_os_type="FreeBSD" ;;
   *-*-openbsd*)
     llvm_cv_target_os_type="OpenBSD" ;;
@@ -5583,6 +5584,20 @@ _ACEOF
 
 
 
+# Check whether --with-sysroot was given.
+if test "${with_sysroot+set}" = set; then
+  withval=$with_sysroot;
+else
+  withval=""
+fi
+
+
+cat >>confdefs.h <<_ACEOF
+#define DEFAULT_SYSROOT "$withval"
+_ACEOF
+
+
+
 # Check whether --with-binutils-include was given.
 if test "${with_binutils_include+set}" = set; then
   withval=$with_binutils_include;
@@ -10386,7 +10401,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 10387 "configure"
+#line 10404 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 69e358031eb..95c4d6cac79 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -11,9 +11,6 @@
 /* Relative directory for resource files */
 #define CLANG_RESOURCE_DIR "${CLANG_RESOURCE_DIR}"
 
-/* Directory wherelibstdc++ is installed. */
-#define GCC_INSTALL_PREFIX "${GCC_INSTALL_PREFIX}"
-
 /* Directories clang will search for headers */
 #define C_INCLUDE_DIRS "${C_INCLUDE_DIRS}"
 
diff --git a/include/llvm/Config/config.h.in b/include/llvm/Config/config.h.in
index ccff7da9671..677bf2e40b8 100644
--- a/include/llvm/Config/config.h.in
+++ b/include/llvm/Config/config.h.in
@@ -12,6 +12,9 @@
 /* Directories clang will search for headers */
 #undef C_INCLUDE_DIRS
 
+/* Default <path> to all compiler invocations for --sysroot=<path>. */
+#undef DEFAULT_SYSROOT
+
 /* Define if position independent code is enabled */
 #undef ENABLE_PIC