2 files changed, 21 insertions, 0 deletions

diff --git a/flake.nix b/flake.nix
index 5d3608b..2ca2e29 100644
--- a/flake.nix
+++ b/flake.nix
@@ -86,6 +86,15 @@
                   urls = [ "http://botan.randombit.net/releases/Botan-${version}.${source_extension}" ];
                   inherit hash;
                 };
+                patches =
+                  if pkgs.lib.hasPrefix "2.0" version then
+                    (prev.patches or [ ])
+                    ++ [
+                      # Fix missing include https://github.com/randombit/botan/issues/903
+                      ./nix/botan-2.0.0-2.0.1.patch
+                    ]
+                  else
+                    [ ];
               }
             );
 
diff --git a/nix/botan-2.0.0-2.0.1.patch b/nix/botan-2.0.0-2.0.1.patch
new file mode 100644
index 0000000..3a19870
--- /dev/null
+++ b/nix/botan-2.0.0-2.0.1.patch
@@ -0,0 +1,12 @@
+diff --git a/src/lib/filters/threaded_fork.cpp b/src/lib/filters/threaded_fork.cpp
+index 170264353e..d379eacda2 100644
+--- a/src/lib/filters/threaded_fork.cpp
++++ b/src/lib/filters/threaded_fork.cpp
+@@ -12,6 +12,7 @@
+ 
+ #include <botan/internal/semaphore.h>
+ #include <botan/internal/barrier.h>
++#include <functional>
+ 
+ namespace Botan {
+