--- a/common/autoconf/boot-jdk.m4	Wed Jul 05 19:40:19 2017 +0200
+++ b/common/autoconf/boot-jdk.m4	Tue May 13 10:20:06 2014 +0100
@@ -331,8 +331,8 @@
 
   # Finally, set some other options...
 
-  # When compiling code to be executed by the Boot JDK, force jdk7 compatibility.
-  BOOT_JDK_SOURCETARGET="-source 7 -target 7"
+  # When compiling code to be executed by the Boot JDK, force jdk8 compatibility.
+  BOOT_JDK_SOURCETARGET="-source 8 -target 8"
   AC_SUBST(BOOT_JDK_SOURCETARGET)
   AC_SUBST(JAVAC_FLAGS)
 ])