diff -ru misc/icu/source/data/pkgdataMakefile.in misc/build/icu/source/data/pkgdataMakefile.in
--- misc/icu/source/data/pkgdataMakefile.in	2024-10-21 16:00:26.000000000 -0400
+++ misc/build/icu/source/data/pkgdataMakefile.in	2024-10-21 16:00:35.000000000 -0400
@@ -14,6 +14,10 @@
 
 OUTPUTFILE=icupkg.inc
 MIDDLE_SO_TARGET=
+# LD_SONAME must end with a path, but on Darwin this does not happen, because
+# file source/config/mh-darwin makes it end with FINAL_SO_TARGET, instead of
+# MIDDLE_SO_TARGET like other Unixes.
+LD_SONAME = -Wl,-compatibility_version -Wl,$(SO_TARGET_VERSION_MAJOR) -Wl,-current_version -Wl,$(SO_TARGET_VERSION) -install_name @executable_path/
 
 all : clean 
 	@echo GENCCODE_ASSEMBLY_TYPE=$(GENCCODE_ASSEMBLY) >> $(OUTPUTFILE)