diff --git a/textproc/uim/files/patch-sigscheme_libgcroots_include_private_gc_priv.h b/textproc/uim/files/patch-sigscheme_libgcroots_include_private_gc_priv.h
new file mode 100644
index 000000000000..d62331d5f718
--- /dev/null
+++ b/textproc/uim/files/patch-sigscheme_libgcroots_include_private_gc_priv.h
@@ -0,0 +1,11 @@
+--- sigscheme/libgcroots/include/private/gc_priv.h.orig	2020-08-25 09:13:47 UTC
++++ sigscheme/libgcroots/include/private/gc_priv.h
+@@ -1979,7 +1979,7 @@ void GC_err_puts(const char *s);
+   /* the signal mask.						*/
+ # define SETJMP(env) sigsetjmp(env, 1)
+ # define LONGJMP(env, val) siglongjmp(env, val)
+-# define JMP_BUF sigjmp_buf
++# define JMP_BUF extern sigjmp_buf
+ #else
+ # ifdef ECOS
+ #   define SETJMP(env)  hal_setjmp(env)