Source
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--- courier-unicode.h.in.orig 2017-03-09 13:51:25.000000000 +0000
+++ courier-unicode.h.in 2017-11-30 10:38:17.000000000 +0000
extern const char *unicode_locale_chset();
#if @LANGINFO_L@
+#include <langinfo.h>
+#include <xlocale.h>
+
extern const char *unicode_locale_chset_l(locale_t l);
#endif