--- a/firefox-47.0/extensions/spellcheck/hunspell/glue/moz.build
+++ b/firefox-47.0/extensions/spellcheck/hunspell/glue/moz.build
@@ -38,4 +38,4 @@ if CONFIG['GNU_CXX']:
 
 # This variable is referenced in configure.in.  Make sure to change that file
 # too if you need to change this variable.
-DEFINES['HUNSPELL_STATIC'] = True
+DEFINES['HUNSPELL_STATIC'] = not CONFIG['MOZ_NATIVE_HUNSPELL']