From 08e38a4c14310fac1ac20e196b12fcc72c7d8077 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Milo=C5=A1=20Komar=C4=8Devi=C4=87?=
 <4973094+kmilos@users.noreply.github.com>
Date: Fri, 22 Mar 2024 14:05:43 +0100
Subject: Relative and absolute paths for a relocatable pkgconf file

---
 CMakeLists.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1a2beaa..c04fa8a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -192,6 +192,17 @@ if (PUGIXML_USE_POSTFIX)
   endif()
 endif()
 
+# Handle both relative and absolute paths (e.g. NixOS) for a relocatable package
+if(IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
+  set(PUGIXML_PC_INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}")
+else()
+  set(PUGIXML_PC_INCLUDEDIR "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+endif()
+if(IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
+  set(PUGIXML_PC_LIBDIR "${CMAKE_INSTALL_LIBDIR}")
+else()
+  set(PUGIXML_PC_LIBDIR "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}")
+endif()
 configure_file(scripts/pugixml.pc.in pugixml.pc @ONLY)
 
 export(TARGETS ${install-targets}
-- 
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