diff -rupN gettext-0.21/gettext-tools/woe32dll/gettextsrc-exports.c gettext-0.21-new/gettext-tools/woe32dll/gettextsrc-exports.c
--- gettext-0.21/gettext-tools/woe32dll/gettextsrc-exports.c	2019-12-23 12:21:12.000000000 +0100
+++ gettext-0.21-new/gettext-tools/woe32dll/gettextsrc-exports.c	2020-08-03 14:22:17.096473605 +0200
@@ -50,6 +50,7 @@ VARIABLE(formatstring_python)
 VARIABLE(formatstring_python_brace)
 VARIABLE(formatstring_qt)
 VARIABLE(formatstring_qt_plural)
+VARIABLE(formatstring_ruby)
 VARIABLE(formatstring_scheme)
 VARIABLE(formatstring_sh)
 VARIABLE(formatstring_smalltalk)