diff --git a/srcpkgs/wesnoth/patches/glibc-2.26-assert.patch b/srcpkgs/wesnoth/patches/glibc-2.26-assert.patch
new file mode 100644
index 00000000000..dea28f41a7d
--- /dev/null
+++ b/srcpkgs/wesnoth/patches/glibc-2.26-assert.patch
@@ -0,0 +1,31 @@
+--- src/replay.cpp.orig	2016-05-18 00:57:46.000000000 +0000
++++ src/replay.cpp	2017-09-22 20:22:56.660358034 +0000
+@@ -403,7 +403,7 @@
+ 		last_location = *loc_it;
+ 		
+ 		const config &speak = command(last_location).child("speak");
+-		assert(speak);
++		assert(static_cast<bool>(speak));
+ 		add_chat_log_entry(speak, chat_log_appender);
+ 
+ 	}
+@@ -581,7 +581,7 @@
+ config &replay::command(int n)
+ {
+ 	config & retv = cfg_.child("command", n);
+-	assert(retv);
++	assert(static_cast<bool>(retv));
+ 	return retv;
+ }
+ 
+--- src/playcampaign.cpp.orig	2016-05-18 00:57:46.000000000 +0000
++++ src/playcampaign.cpp	2017-09-22 20:25:32.094366053 +0000
+@@ -192,7 +192,7 @@
+ 	if (gamestate.replay_start().empty()){
+ 		// Backwards compatibility code for 1.2 and 1.2.1
+ 		const config &scenario = game_config.find_child(type,"id",gamestate.carryover_sides_start["next_scenario"]);
+-		assert(scenario);
++		assert(static_cast<bool>(scenario));
+ 		gamestate.replay_start() = scenario;
+ 	}
+ 	starting_pos = gamestate.replay_start();