diff -rupN spatialite-tools-5.0.1/Makefile.am spatialite-tools-5.0.1-new/Makefile.am
--- spatialite-tools-5.0.1/Makefile.am	2021-02-07 17:34:04.000000000 +0100
+++ spatialite-tools-5.0.1-new/Makefile.am	2021-12-14 15:45:19.962324159 +0100
@@ -49,6 +49,7 @@ shp_doctor_SOURCES = shp_doctor.c
 shp_sanitize_SOURCES = shp_sanitize.c
 exif_loader_SOURCES = exif_loader.c
 spatialite_xml_validator_SOURCES = spatialite_xml_validator.c
+spatialite_xml_validator_LIBADD = @LIBXML2_LIBS@
 spatialite_xml_load_SOURCES = spatialite_xml_load.c
 spatialite_xml2utf8_SOURCES = spatialite_xml2utf8.c
 spatialite_xml_collapse_SOURCES = spatialite_xml_collapse.c
diff -rupN spatialite-tools-5.0.1/Makefile.in spatialite-tools-5.0.1-new/Makefile.in
--- spatialite-tools-5.0.1/Makefile.in	2021-02-07 17:34:04.000000000 +0100
+++ spatialite-tools-5.0.1-new/Makefile.in	2021-12-14 15:45:42.976287325 +0100
@@ -492,6 +492,7 @@ shp_doctor_SOURCES = shp_doctor.c
 shp_sanitize_SOURCES = shp_sanitize.c
 exif_loader_SOURCES = exif_loader.c
 spatialite_xml_validator_SOURCES = spatialite_xml_validator.c
+spatialite_xml_validator_LDADD = @LIBXML2_LIBS@
 spatialite_xml_load_SOURCES = spatialite_xml_load.c
 spatialite_xml2utf8_SOURCES = spatialite_xml2utf8.c
 spatialite_xml_collapse_SOURCES = spatialite_xml_collapse.c