--- a/common/autoconf/boot-jdk.m4	Thu Jul 21 16:42:56 2016 +0000
+++ b/common/autoconf/boot-jdk.m4	Thu Jul 21 17:13:13 2016 +0000
@@ -345,6 +345,9 @@
   # Disable special log output when a debug build is used as Boot JDK...
   ADD_JVM_ARG_IF_OK([-XX:-PrintVMOptions -XX:-UnlockDiagnosticVMOptions -XX:-LogVMOutput],boot_jdk_jvmargs,[$JAVA])
 
+  # Force en-US environment
+  ADD_JVM_ARG_IF_OK([-Duser.language=en -Duser.country=US],boot_jdk_jvmargs,[$JAVA])
+
   # Apply user provided options.
   ADD_JVM_ARG_IF_OK([$with_boot_jdk_jvmargs],boot_jdk_jvmargs,[$JAVA])