From 3e2fee2a5ef9be617972bb3a2c6bed0a52dae5c7 Mon Sep 17 00:00:00 2001
From: Marcin Serwin <marcin@serwin.dev>
Date: Mon, 22 Dec 2025 16:47:38 +0100
Subject: [PATCH] gpgmepp: fix includedir path in the exported CMake target

Signed-off-by: Marcin Serwin <marcin@serwin.dev>
---
 ...Don-t-hardcode-include-as-includedir.patch | 39 +++++++++++++++++++
 pkgs/by-name/gp/gpgmepp/package.nix           |  5 ++-
 2 files changed, 43 insertions(+), 1 deletion(-)
 create mode 100644 pkgs/by-name/gp/gpgmepp/0001-Don-t-hardcode-include-as-includedir.patch

diff --git a/pkgs/by-name/gp/gpgmepp/0001-Don-t-hardcode-include-as-includedir.patch b/pkgs/by-name/gp/gpgmepp/0001-Don-t-hardcode-include-as-includedir.patch
new file mode 100644
index 000000000000..3109da1af152
--- /dev/null
+++ b/pkgs/by-name/gp/gpgmepp/0001-Don-t-hardcode-include-as-includedir.patch
@@ -0,0 +1,39 @@
+From b56db4b30ec696b018c04400440d0252af13990a Mon Sep 17 00:00:00 2001
+From: Marcin Serwin <marcin@serwin.dev>
+Date: Mon, 22 Dec 2025 16:44:46 +0100
+Subject: [PATCH] Don't hardcode 'include' as includedir
+
+The headers are installed into the location pointed by
+CMAKE_INSTALL_INCLUDEDIR so if it's different than the default 'include'
+then the header path in the exported CMake targets is incorrect.
+
+Signed-off-by: Marcin Serwin <marcin@serwin.dev>
+---
+ src/CMakeLists.txt | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 7be46cb..97d21b1 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -128,7 +128,7 @@ if(ENABLE_SHARED)
+ 
+     target_include_directories(Gpgmepp
+         PRIVATE ${LibGpgError_INCLUDE_DIRS}
+-        INTERFACE $<INSTALL_INTERFACE:include>
++        INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+     )
+ 
+     target_link_libraries(Gpgmepp Gpgme::Gpgme)
+@@ -144,7 +144,7 @@ if(ENABLE_STATIC)
+ 
+     target_include_directories(GpgmeppStatic
+         PRIVATE ${LibGpgError_INCLUDE_DIRS}
+-        INTERFACE $<INSTALL_INTERFACE:include>
++        INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
+     )
+ 
+     target_link_libraries(GpgmeppStatic Gpgme::Gpgme)
+-- 
+2.51.2
+
diff --git a/pkgs/by-name/gp/gpgmepp/package.nix b/pkgs/by-name/gp/gpgmepp/package.nix
index b595fecb593f..c802a7a3a015 100644
--- a/pkgs/by-name/gp/gpgmepp/package.nix
+++ b/pkgs/by-name/gp/gpgmepp/package.nix
@@ -16,7 +16,10 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-1HlgScBnCKJvMJb3SO8JU0fho8HlcFYXAf6VLD9WU4I=";
   };
 
-  patches = [ ./0001-Fix-handling-of-absolute-install-dirs-in-.pc-install.patch ];
+  patches = [
+    ./0001-Fix-handling-of-absolute-install-dirs-in-.pc-install.patch
+    ./0001-Don-t-hardcode-include-as-includedir.patch
+  ];
 
   nativeBuildInputs = [
     cmake