Upstream PR: https://github.com/lxqt/libdbusmenu-lxqt/pull/29

From 453cc0cdf6a088484231b3dd090f60f5b45ff3b9 Mon Sep 17 00:00:00 2001
From: Jimi Huotari <chiitoo@gentoo.org>
Date: Thu, 6 Aug 2026 12:05:10 +0300
Subject: [PATCH 1/2] cmake: fix pkgconfig libdir path and use more
 GNUInstallDirs

Adapted from: https://gitweb.gentoo.org/repo/gentoo.git/tree/dev-libs/libdbusmenu-qt/files/libdbusmenu-qt-0.9.3_pre20160218-cmake.patch

Signed-off-by: Jimi Huotari <chiitoo@gentoo.org>
---
 CMakeLists.txt      | 10 ++++------
 dbusmenu-lxqt.pc.in |  6 +++---
 src/CMakeLists.txt  | 10 +++++-----
 3 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1805106..6720378 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,14 +34,12 @@ include (CheckCXXCompilerFlag)
 include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
 
-set(LIB_DESTINATION "${CMAKE_INSTALL_LIBDIR}")
-set(CMAKECONFIG_INSTALL_DIR "${LIB_DESTINATION}/cmake/dbusmenu-lxqt")
-set(INCLUDE_INSTALL_DIR "include/dbusmenu-lxqt")
+set(INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_INCLUDEDIR}/dbusmenu-lxqt")
 
 configure_file(dbusmenu-lxqt.pc.in ${CMAKE_BINARY_DIR}/dbusmenu-lxqt.pc @ONLY)
 
 install(FILES ${CMAKE_BINARY_DIR}/dbusmenu-lxqt.pc
-        DESTINATION ${LIB_DESTINATION}/pkgconfig
+        DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
 )
 
 add_subdirectory(src)
@@ -51,7 +49,7 @@ add_subdirectory(tests)
 configure_package_config_file(
     dbusmenu-lxqt-config.cmake.in
     ${CMAKE_BINARY_DIR}/dbusmenu-lxqt-config.cmake
-    INSTALL_DESTINATION ${CMAKECONFIG_INSTALL_DIR}
+    INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/dbusmenu-lxqt
     PATH_VARS INCLUDE_INSTALL_DIR
 )
 
@@ -65,6 +63,6 @@ write_basic_package_version_file(
 install(FILES
     ${CMAKE_BINARY_DIR}/dbusmenu-lxqt-config.cmake
     ${CMAKE_BINARY_DIR}/dbusmenu-lxqt-config-version.cmake
-    DESTINATION "${CMAKECONFIG_INSTALL_DIR}"
+    DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/dbusmenu-lxqt"
     COMPONENT Devel
 )
diff --git a/dbusmenu-lxqt.pc.in b/dbusmenu-lxqt.pc.in
index d437851..60e81ad 100644
--- a/dbusmenu-lxqt.pc.in
+++ b/dbusmenu-lxqt.pc.in
@@ -1,7 +1,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
-exec_prefix=@CMAKE_INSTALL_PREFIX@
-libdir=@CMAKE_INSTALL_PREFIX@/lib
-includedir=@CMAKE_INSTALL_PREFIX@/include/dbusmenu-lxqt
+exec_prefix=${prefix}
+libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/dbusmenu-lxqt
 
 Name: libdbusmenu-lxqt
 Description: Qt implementation of dbusmenu spec
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a2839b3..2bf27ce 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -30,23 +30,23 @@ target_link_libraries(dbusmenu-lxqt
 
 # Make sure linking to the target adds dbusmenu-lxqt install directory
 target_include_directories(dbusmenu-lxqt
-    INTERFACE "$<INSTALL_INTERFACE:${INCLUDE_INSTALL_DIR}>")
+    INTERFACE "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/dbusmenu-lxqt>")
 
 install(TARGETS dbusmenu-lxqt
     EXPORT dbusmenu-lxqt-targets
-    LIBRARY DESTINATION ${LIB_DESTINATION}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     RUNTIME DESTINATION bin
 )
 
 install(EXPORT dbusmenu-lxqt-targets
-    DESTINATION ${CMAKECONFIG_INSTALL_DIR})
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/dbusmenu-lxqt)
 
 install(DIRECTORY .
-    DESTINATION ${INCLUDE_INSTALL_DIR}
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/dbusmenu-lxqt
     FILES_MATCHING PATTERN "*.h"
     PATTERN "*_p.h" EXCLUDE
 )
 
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/dbusmenu_version.h
-    DESTINATION ${INCLUDE_INSTALL_DIR}
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/dbusmenu-lxqt
 )