common/autoconf/basics.m4

@@ -660,10 +660,15 @@
   AC_ARG_WITH(sysroot, [AS_HELP_STRING([--with-sysroot],
       [use this directory as sysroot])],
       [SYSROOT=$with_sysroot]
   )
 
+  AC_ARG_WITH(build_sysroot, [AS_HELP_STRING([--with-build-sysroot],
+      [use this directory as build_sysroot])],
+      [BUILD_SYSROOT=$with_build_sysroot]
+  )
+
   AC_ARG_WITH([tools-dir], [AS_HELP_STRING([--with-tools-dir],
       [alias for --with-toolchain-path for backwards compatibility])],
       [BASIC_PREPEND_TO_PATH([TOOLCHAIN_PATH],$with_tools_dir)]
   )