1 files changed, 60 insertions, 0 deletions
diff --git a/dev-lang/maude/files/maude-2.7-fix-build-with-gcc11.patch b/dev-lang/maude/files/maude-2.7-fix-build-with-gcc11.patch
new file mode 100644
index 000000000000..b903d50e22bc
--- /dev/null
+++ b/dev-lang/maude/files/maude-2.7-fix-build-with-gcc11.patch
@@ -0,0 +1,60 @@
+https://bugs.gentoo.org/787851
+
+From 6d448928a88f586195dadd9fae9cb1b19e589d94 Mon Sep 17 00:00:00 2001
+From: Sam James <sam@gentoo.org>
+Date: Tue, 15 Jun 2021 03:05:34 +0000
+Subject: [PATCH] Fix build with GCC 11
+diff --git a/src/ObjectSystem/configSymbol.hh b/src/ObjectSystem/configSymbol.hh
+index 90b00d9..d037dab 100644
+--- a/src/ObjectSystem/configSymbol.hh
++++ b/src/ObjectSystem/configSymbol.hh
+@@ -50,7 +50,7 @@ public:
+ private:
+   struct symbolLt
+   {
+-    bool operator()(const Symbol* d1, const Symbol* d2)
++    bool operator()(const Symbol* d1, const Symbol* d2) const
+     {
+       return d1->compare(d2) < 0;
+     }
+diff --git a/src/ObjectSystem/objectMap.cc b/src/ObjectSystem/objectMap.cc
+index 0dbcaf0..722aa29 100644
+--- a/src/ObjectSystem/objectMap.cc
++++ b/src/ObjectSystem/objectMap.cc
+@@ -50,7 +50,7 @@ ConfigSymbol::MessageQueue::markReachableNodes() const
+ 
+ struct ConfigSymbol::dagNodeLt
+ {
+-  bool operator()(const DagNode* d1, const DagNode* d2)
++  bool operator()(const DagNode* d1, const DagNode* d2) const
+     {
+       return d1->compare(d2) < 0;
+     }
+diff --git a/src/ObjectSystem/objectSystemRewritingContext.hh b/src/ObjectSystem/objectSystemRewritingContext.hh
+index 33785ec..32f4d94 100644
+--- a/src/ObjectSystem/objectSystemRewritingContext.hh
++++ b/src/ObjectSystem/objectSystemRewritingContext.hh
+@@ -62,7 +62,7 @@ protected:
+ private:
+   struct dagNodeLt
+   {
+-    bool operator()(const DagNode* d1, const DagNode* d2)
++    bool operator()(const DagNode* d1, const DagNode* d2) const
+     {
+       return d1->compare(d2) < 0;
+     }
+diff --git a/src/Mixfix/entity.hh b/src/Mixfix/entity.hh
+index eb8ad58..a221de4 100644
+--- a/src/Mixfix/entity.hh
++++ b/src/Mixfix/entity.hh
+@@ -53,7 +53,7 @@ public:
+ private:
+   struct UserLt
+   {
+-    bool operator()(const User* user1, const User* user2)
++    bool operator()(const User* user1, const User* user2) const
+     {
+       //
+       //   Direct < comparison of unrelated pointers is undefined. But since the casting
+--
+2.32.0