[libxml2] cmake: Adjust paths for UNIX or UNIX-like target systems

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 6d10df7c5c6a098078db8a7649d5d9a1f820d9cd
Author: Daniel Engberg <daniel engberg lists pyret net>
Date:   Sat Apr 2 22:23:44 2022 +0200

    cmake: Adjust paths for UNIX or UNIX-like target systems
    
    Sync paths with GNU Autotools

 CMakeLists.txt | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 94dfc1df..7cd70bc8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -655,14 +655,20 @@ set(XML_PRIVATE_LIBS "${Z_LIBS} ${LZMA_LIBS} ${THREAD_LIBS} ${ICONV_LIBS} ${ICU_
 file(RELATIVE_PATH PACKAGE_RELATIVE_PATH "${CMAKE_INSTALL_FULL_LIBDIR}/pkgconfig" "${CMAKE_INSTALL_PREFIX}")
 string(REGEX REPLACE "/$" "" PACKAGE_RELATIVE_PATH "${PACKAGE_RELATIVE_PATH}")
 
-set(prefix "\${pcfiledir}/${PACKAGE_RELATIVE_PATH}")
+if(WIN32)
+       set(prefix "\${pcfiledir}/${PACKAGE_RELATIVE_PATH}")
+else()
+       set(prefix "${CMAKE_INSTALL_PREFIX}")
+endif()
 set(exec_prefix "\${prefix}")
 set(libdir "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
 set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
 configure_file(libxml-2.0.pc.in libxml-2.0.pc @ONLY)
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libxml-2.0.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig 
COMPONENT development)
 
-set(prefix "\$(cd \"\$(dirname \"\$0\")\"; pwd -P)/..")
+if(WIN32)
+       set(prefix "\$(cd \"\$(dirname \"\$0\")\"; pwd -P)/..")
+endif()
 configure_file(xml2-config.in xml2-config @ONLY)
 install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/xml2-config DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT 
development)