We need to add guards around the 64-bit variants.

--- libidn-1.36/gltests/test-stdint.c.orig	2020-04-28 17:02:42.000000000 +0000
+++ libidn-1.36/gltests/test-stdint.c	2020-12-27 19:36:09.452134750 +0000
@@ -397,16 +397,20 @@
 verify_width (UINT_LEAST16_WIDTH, 0, UINT_LEAST16_MAX);
 verify_width (INT_LEAST32_WIDTH, INT_LEAST32_MIN, INT_LEAST32_MAX);
 verify_width (UINT_LEAST32_WIDTH, 0, UINT_LEAST32_MAX);
+#ifdef INT_LEAST64_MAX
 verify_width (INT_LEAST64_WIDTH, INT_LEAST64_MIN, INT_LEAST64_MAX);
 verify_width (UINT_LEAST64_WIDTH, 0, UINT_LEAST64_MAX);
+#endif
 verify_width (INT_FAST8_WIDTH, INT_FAST8_MIN, INT_FAST8_MAX);
 verify_width (UINT_FAST8_WIDTH, 0, UINT_FAST8_MAX);
 verify_width (INT_FAST16_WIDTH, INT_FAST16_MIN, INT_FAST16_MAX);
 verify_width (UINT_FAST16_WIDTH, 0, UINT_FAST16_MAX);
 verify_width (INT_FAST32_WIDTH, INT_FAST32_MIN, INT_FAST32_MAX);
 verify_width (UINT_FAST32_WIDTH, 0, UINT_FAST32_MAX);
+#ifdef INT_FAST64_MAX
 verify_width (INT_FAST64_WIDTH, INT_FAST64_MIN, INT_FAST64_MAX);
 verify_width (UINT_FAST64_WIDTH, 0, UINT_FAST64_MAX);
+#endif
 verify_width (INTPTR_WIDTH, INTPTR_MIN, INTPTR_MAX);
 verify_width (UINTPTR_WIDTH, 0, UINTPTR_MAX);
 verify_width (INTMAX_WIDTH, INTMAX_MIN, INTMAX_MAX);
--- libidn-1.36/lib/gltests/test-stdint.c.orig	2020-04-28 17:03:22.000000000 +0000
+++ libidn-1.36/lib/gltests/test-stdint.c	2020-12-27 19:54:25.946698275 +0000
@@ -397,16 +397,20 @@
 verify_width (UINT_LEAST16_WIDTH, 0, UINT_LEAST16_MAX);
 verify_width (INT_LEAST32_WIDTH, INT_LEAST32_MIN, INT_LEAST32_MAX);
 verify_width (UINT_LEAST32_WIDTH, 0, UINT_LEAST32_MAX);
+#ifdef INT_LEAST64_MAX
 verify_width (INT_LEAST64_WIDTH, INT_LEAST64_MIN, INT_LEAST64_MAX);
 verify_width (UINT_LEAST64_WIDTH, 0, UINT_LEAST64_MAX);
+#endif
 verify_width (INT_FAST8_WIDTH, INT_FAST8_MIN, INT_FAST8_MAX);
 verify_width (UINT_FAST8_WIDTH, 0, UINT_FAST8_MAX);
 verify_width (INT_FAST16_WIDTH, INT_FAST16_MIN, INT_FAST16_MAX);
 verify_width (UINT_FAST16_WIDTH, 0, UINT_FAST16_MAX);
 verify_width (INT_FAST32_WIDTH, INT_FAST32_MIN, INT_FAST32_MAX);
 verify_width (UINT_FAST32_WIDTH, 0, UINT_FAST32_MAX);
+#ifdef INT_FAST64_MAX
 verify_width (INT_FAST64_WIDTH, INT_FAST64_MIN, INT_FAST64_MAX);
 verify_width (UINT_FAST64_WIDTH, 0, UINT_FAST64_MAX);
+#endif
 verify_width (INTPTR_WIDTH, INTPTR_MIN, INTPTR_MAX);
 verify_width (UINTPTR_WIDTH, 0, UINTPTR_MAX);
 verify_width (INTMAX_WIDTH, INTMAX_MIN, INTMAX_MAX);