commit c423d1ddf0345aed7ecaf4c8b9e1fa5108aafc6f
Author: sternenseemann <sternenseemann@systemli.org>
Date:   Sat Jul 2 12:35:56 2022 +0200

    Force use of CMake-shipped FindLibXml2 module
    
    This is needed to work around a nixpkgs bug:
    https://github.com/NixOS/nixpkgs/issues/125008

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a75b6fb1..c1408283 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,7 +42,7 @@ set(ANTLR4_TAG tags/4.9.3)
 find_path(ANTLR4_HEADER antlr4-runtime.h PATH_SUFFIXES antlr4-runtime)
 set(ANTLR4_INCLUDE_DIRS ${ANTLR4_HEADER})
 
-FIND_PACKAGE(LibXml2)
+FIND_PACKAGE(LibXml2 REQUIRED MODULE)
 IF (NOT ${LibXml2_FOUND})
    MESSAGE(STATUS "Could not locate LibXml2, will install externally.")
    set(LIBXML2_TAG tags/v2.9.13)