diff -Nurd icu.orig/source/common/uresbund.cpp icu/source/common/uresbund.cpp
--- icu.orig/source/common/uresbund.cpp	2022-10-18 20:53:21.000000000 -0400
+++ icu/source/common/uresbund.cpp	2023-02-02 22:17:16.000000000 -0500
@@ -202,7 +202,8 @@
  */
 static bool getParentLocaleID(char *name, const char *origName, UResOpenType openType) {
     // early out if the locale ID has a variant code or ends with _
-    if (name[uprv_strlen(name) - 1] == '_' || hasVariant(name)) {
+    size_t nameLen = uprv_strlen(name);
+    if (!nameLen || name[nameLen - 1] == '_' || hasVariant(name)) {
         return chopLocale(name);
     }
     
diff -Nurd icu.orig/source/icudefs.mk.in icu/source/icudefs.mk.in
--- icu.orig/source/icudefs.mk.in	2022-10-18 20:53:21.000000000 -0400
+++ icu/source/icudefs.mk.in	2023-02-02 22:16:03.000000000 -0500
@@ -286,13 +286,13 @@
 LSTUBDIR	= -L$(top_builddir)/stubdata
 LCTESTFW	= -L$(top_builddir)/tools/ctestfw
 
-LIBICUDT	= $(LLIBDIR) $(LSTUBDIR) $(ICULIBS_DT)
-LIBICUUC	= $(LLIBDIR) $(ICULIBS_UC) $(LSTUBDIR) $(ICULIBS_DT)
-LIBICUI18N	= $(LLIBDIR) $(ICULIBS_I18N)
+LIBICUDT	= $(LSTUBDIR) $(LLIBDIR) $(ICULIBS_DT)
+LIBICUUC	= $(LSTUBDIR) $(LLIBDIR) $(ICULIBS_UC) $(ICULIBS_DT)
+LIBICUI18N	= $(ICULIBS_I18N)
 LIBICULE	= $(ICULEHB_CFLAGS) $(LLIBDIR) $(ICULIBS_LE)
 LIBICULX	= $(LLIBDIR) $(ICULIBS_LX)
 LIBCTESTFW	= $(LCTESTFW) $(ICULIBS_CTESTFW)
-LIBICUTOOLUTIL	= $(LLIBDIR) $(ICULIBS_TOOLUTIL)
+LIBICUTOOLUTIL	= $(LSTUBDIR) $(LLIBDIR) $(ICULIBS_TOOLUTIL)
 LIBICUIO	= $(LLIBDIR) $(ICULIBS_IO)
 
 # Invoke, set library path for all ICU libraries.