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diff --git a/source/l/readline/readline-8.1-patches/readline81-001 b/source/l/readline/readline-8.1-patches/readline81-001
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+++ b/source/l/readline/readline-8.1-patches/readline81-001
@@ -0,0 +1,92 @@
+ READLINE PATCH REPORT
+ =====================
+
+Readline-Release: 8.1
+Patch-ID: readline81-001
+
+Bug-Reported-by: Tom Tromey <tom@tromey.com>
+Bug-Reference-ID: <875z3u9fd0.fsf@tromey.com>
+Bug-Reference-URL: https://lists.gnu.org/archive/html/bug-readline/2021-01/msg00009.html
+
+Bug-Description:
+
+The code to check readline versions in an inputrc file had the sense of the
+comparisons reversed.
+
+Patch (apply with `patch -p0'):
+
+*** ../readline-8.1-patched/bind.c 2020-10-26 10:03:14.000000000 -0400
+--- bind.c 2021-01-18 16:38:48.000000000 -0500
+***************
+*** 1235,1239 ****
+ else if (_rl_strnicmp (args, "version", 7) == 0)
+ {
+! int rlversion, versionarg, op, previ, major, minor;
+
+ _rl_parsing_conditionalized_out = 1;
+--- 1235,1239 ----
+ else if (_rl_strnicmp (args, "version", 7) == 0)
+ {
+! int rlversion, versionarg, op, previ, major, minor, opresult;
+
+ _rl_parsing_conditionalized_out = 1;
+***************
+*** 1295,1316 ****
+ {
+ case OP_EQ:
+! _rl_parsing_conditionalized_out = rlversion == versionarg;
+ break;
+ case OP_NE:
+! _rl_parsing_conditionalized_out = rlversion != versionarg;
+ break;
+ case OP_GT:
+! _rl_parsing_conditionalized_out = rlversion > versionarg;
+ break;
+ case OP_GE:
+! _rl_parsing_conditionalized_out = rlversion >= versionarg;
+ break;
+ case OP_LT:
+! _rl_parsing_conditionalized_out = rlversion < versionarg;
+ break;
+ case OP_LE:
+! _rl_parsing_conditionalized_out = rlversion <= versionarg;
+ break;
+ }
+ }
+ /* Check to see if the first word in ARGS is the same as the
+--- 1295,1317 ----
+ {
+ case OP_EQ:
+! opresult = rlversion == versionarg;
+ break;
+ case OP_NE:
+! opresult = rlversion != versionarg;
+ break;
+ case OP_GT:
+! opresult = rlversion > versionarg;
+ break;
+ case OP_GE:
+! opresult = rlversion >= versionarg;
+ break;
+ case OP_LT:
+! opresult = rlversion < versionarg;
+ break;
+ case OP_LE:
+! opresult = rlversion <= versionarg;
+ break;
+ }
++ _rl_parsing_conditionalized_out = 1 - opresult;
+ }
+ /* Check to see if the first word in ARGS is the same as the
+
+*** ../readline-8.1/patchlevel 2013-11-15 08:11:11.000000000 -0500
+--- patchlevel 2014-03-21 08:28:40.000000000 -0400
+***************
+*** 1,3 ****
+ # Do not edit -- exists only for use by patch
+
+! 0
+--- 1,3 ----
+ # Do not edit -- exists only for use by patch
+
+! 1