diff -ru misc/icu/source/common/putil.c misc/build/icu/source/common/putil.c
--- misc/icu/source/common/putil.c	2009-07-01 20:50:38.000000000 +0200
+++ misc/build/icu/source/common/putil.c	2024-06-14 21:17:04.184218726 +0200
@@ -52,7 +52,7 @@
 Poorly upgraded Solaris machines can't have this defined.
 Cleanly installed Solaris can use this #define.
 */
-#if !defined(_XOPEN_SOURCE_EXTENDED) && (!defined(__STDC_VERSION__) || __STDC_VERSION__ >= 199901L)
+#if !defined(_XOPEN_SOURCE_EXTENDED) && (!defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901L)
 #define _XOPEN_SOURCE_EXTENDED 1
 #endif
 
diff -ru misc/icu/source/common/uloc.c misc/build/icu/source/common/uloc.c
--- misc/icu/source/common/uloc.c	2009-07-01 20:50:38.000000000 +0200
+++ misc/build/icu/source/common/uloc.c	2024-06-14 21:25:59.612644465 +0200
@@ -1736,7 +1736,7 @@
                 int32_t variantLen = _deleteVariant(variant, uprv_min(variantSize, (nameCapacity-len)), variantToCompare, n);
                 len -= variantLen;
                 if (variantLen > 0) {
-                    if (name[len-1] == '_') { /* delete trailing '_' */
+                    if (len > 0 && name[len-1] == '_') { /* delete trailing '_' */
                         --len;
                     }
                     addKeyword = VARIANT_MAP[j].keyword;
@@ -1744,7 +1744,7 @@
                     break;
                 }
             }
-            if (name[len-1] == '_') { /* delete trailing '_' */
+            if (len > 0 && name[len-1] == '_') { /* delete trailing '_' */
                 --len;
             }
         }
diff -ru misc/icu/source/config/mh-bsd-gcc misc/build/icu/source/config/mh-bsd-gcc
--- misc/icu/source/config/mh-bsd-gcc	2009-07-01 20:50:48.000000000 +0200
+++ misc/build/icu/source/config/mh-bsd-gcc	2024-06-14 21:16:18.187059931 +0200
@@ -18,8 +18,12 @@
 
 ## Compiler switch to embed a runtime search path
 LD_RPATH=	
-LD_RPATH_PRE=	-Wl,-rpath,
+LD_RPATH_PRE=	-Wl,-z,origin -Wl,-rpath,
 
+## Force RPATH=$ORIGIN to locate own dependencies w/o need for LD_LIBRARY_PATH
+## (incl. the C++ runtime libs potentially found in the URE lib dir):
+ENABLE_RPATH=YES
+RPATHLDFLAGS=${LD_RPATH_PRE}'$$ORIGIN:$$ORIGIN/../ure-link/lib'
 ## Compiler switch to embed a library name
 LD_SONAME = -Wl,-soname -Wl,$(notdir $(MIDDLE_SO_TARGET))
 
diff -ru misc/icu/source/config/mh-darwin misc/build/icu/source/config/mh-darwin
--- misc/icu/source/config/mh-darwin	2009-07-01 20:50:48.000000000 +0200
+++ misc/build/icu/source/config/mh-darwin	2024-06-14 21:19:02.155170814 +0200
@@ -25,7 +25,7 @@
 SHLIB.cc=	$(CXX) -dynamiclib -dynamic $(CXXFLAGS) $(LDFLAGS)
 
 ## Compiler switches to embed a library name and version information
-LD_SONAME = -Wl,-compatibility_version -Wl,$(SO_TARGET_VERSION_MAJOR) -Wl,-current_version -Wl,$(SO_TARGET_VERSION) -install_name $(notdir $(MIDDLE_SO_TARGET))
+LD_SONAME = -Wl,-compatibility_version -Wl,$(SO_TARGET_VERSION_MAJOR) -Wl,-current_version -Wl,$(SO_TARGET_VERSION) -install_name @executable_path/$(notdir $(FINAL_SO_TARGET))
 
 ## Compiler switch to embed a runtime search path
 LD_RPATH=
@@ -41,10 +41,6 @@
 ## Non-shared intermediate object suffix
 STATIC_O = ao
 
-## Override Versioned target for a shared library.
-FINAL_SO_TARGET=  $(basename $(SO_TARGET)).$(SO_TARGET_VERSION).$(SO)
-MIDDLE_SO_TARGET= $(basename $(SO_TARGET)).$(SO_TARGET_VERSION_MAJOR).$(SO)
-
 ## Compilation rules
 %.$(STATIC_O): $(srcdir)/%.c
 	$(COMPILE.c) $(STATICCPPFLAGS) $(STATICCFLAGS) -o $@ $<
@@ -76,15 +72,9 @@
 
 ## Versioned libraries rules
 
-%.$(SO_TARGET_VERSION_MAJOR).$(SO): %.$(SO_TARGET_VERSION).$(SO)
+%.$(SO).$(SO_TARGET_VERSION_MAJOR): %.$(SO).$(SO_TARGET_VERSION)
 	$(RM) $@ && ln -s ${<F} $@
-%.$(SO): %.$(SO_TARGET_VERSION_MAJOR).$(SO)
-	$(RM) $@ && ln -s ${*F}.$(SO_TARGET_VERSION).$(SO) $@
-
-# tzcode option
-TZORIG_EXTRA_CFLAGS=-DSTD_INSPIRED
-
-# genren opts
-GENREN_PL_OPTS=-x Mach-O -n '-g' -p '| c++filt'
+%.$(SO): %.$(SO).$(SO_TARGET_VERSION_MAJOR)
+	$(RM) $@ && ln -s ${*F}.$(SO).$(SO_TARGET_VERSION) $@
 
 ## End Darwin-specific setup
diff -ru misc/icu/source/config/mh-linux misc/build/icu/source/config/mh-linux
--- misc/icu/source/config/mh-linux	2009-07-01 20:50:48.000000000 +0200
+++ misc/build/icu/source/config/mh-linux	2024-06-14 21:19:31.827909846 +0200
@@ -20,6 +20,11 @@
 LD_RPATH=
 LD_RPATH_PRE = -Wl,-rpath,
 
+## Force RPATH=$ORIGIN to locate own dependencies w/o need for LD_LIBRARY_PATH
+## (incl. the C++ runtime libs potentially found in the URE lib dir):
+ENABLE_RPATH=YES
+RPATHLDFLAGS=${LD_RPATH_PRE}'$$ORIGIN:$$ORIGIN/../ure-link/lib'
+
 ## These are the library specific LDFLAGS
 LDFLAGSICUDT=-nodefaultlibs -nostdlib
 
diff -ru misc/icu/source/config/mh-mingw misc/build/icu/source/config/mh-mingw
--- misc/icu/source/config/mh-mingw	2009-07-01 20:50:48.000000000 +0200
+++ misc/build/icu/source/config/mh-mingw	2024-06-14 21:20:44.741721341 +0200
@@ -76,6 +76,8 @@
 # Current full path directory for use in source code in a -D compiler option.
 #CURR_SRCCODE_FULL_DIR=$(subst /,\\\\,$(shell pwd -W))#M# for MSYS
 CURR_SRCCODE_FULL_DIR=$(subst \,/,$(shell cmd /c cd))#M# for Cygwin shell
+SRCDIR_DEPEND=$(shell cd $(SRCDIR) && pwd)
+DATAFILEPATHS_DEPEND=$(foreach p,$(DATAFILEPATHS),$(shell cd $(dir $(p)) && pwd)/$(notdir $(p)))
 
 ## Compilation rules
 %.$(STATIC_O): $(srcdir)/%.c
diff -ru misc/icu/source/config/mh-solaris misc/build/icu/source/config/mh-solaris
--- misc/icu/source/config/mh-solaris	2009-07-01 20:50:48.000000000 +0200
+++ misc/build/icu/source/config/mh-solaris	2024-06-14 21:22:01.599625394 +0200
@@ -18,17 +18,21 @@
 
 ## Commands to link
 ## For Sun Workshop, use CC to link to bring in C++ runtime
-LINK.c=		$(CXX) $(CXXFLAGS) $(LDFLAGS)
-LINK.cc=	$(CXX) $(CXXFLAGS) $(LDFLAGS)
+LINK.c=		$(CXX) $(CXXFLAGS) $(LDFLAGS) -norunpath
+LINK.cc=	$(CXX) $(CXXFLAGS) $(LDFLAGS) -norunpath
 
 ## Commands to make a shared library
 SHLIB.c=	$(CC) $(CFLAGS) $(LDFLAGS) -G
-SHLIB.cc=	$(CXX) $(CXXFLAGS) $(LDFLAGS) -G
+SHLIB.cc=	$(CXX) $(CXXFLAGS) $(LDFLAGS) -G -norunpath
 
 ## Compiler switch to embed a runtime search path
 LD_RPATH=	-R
 LD_RPATH_PRE=	
 
+## Force RPATH=$ORIGIN to locate own dependencies w/o need for LD_LIBRARY_PATH
+ENABLE_RPATH=YES
+RPATHLDFLAGS=${LD_RPATH}'$$ORIGIN'
+
 #LIBRARY_PATH_PREFIX=/usr/lib/lwp:
 
 ## Compiler switch to embed a library name
diff -ru misc/icu/source/layout/ArabicShaping.cpp misc/build/icu/source/layout/ArabicShaping.cpp
--- misc/icu/source/layout/ArabicShaping.cpp	2009-07-01 20:51:24.000000000 +0200
+++ misc/build/icu/source/layout/ArabicShaping.cpp	2024-06-14 21:23:05.557119301 +0200
@@ -79,7 +79,6 @@
 #define markFeatureMask 0x00040000UL
 #define mkmkFeatureMask 0x00020000UL
 
-#define NO_FEATURES   0
 #define ISOL_FEATURES (isolFeatureMask | ligaFeatureMask | msetFeatureMask | markFeatureMask | ccmpFeatureMask | rligFeatureMask | caltFeatureMask | dligFeatureMask | cswhFeatureMask | cursFeatureMask | kernFeatureMask | mkmkFeatureMask)
 
 #define SHAPE_MASK 0xF0000000UL
@@ -174,11 +173,7 @@
         LEUnicode c = chars[in];
         ShapeType t = getShapeType(c);
 
-        if (t == ST_NOSHAPE_NONE) {
-            glyphStorage.setAuxData(out, NO_FEATURES, success);
-        } else {
-            glyphStorage.setAuxData(out, ISOL_FEATURES, success);
-        }
+        glyphStorage.setAuxData(out, ISOL_FEATURES, success);
 
         if ((t & MASK_TRANSPARENT) != 0) {
             continue;
diff -ru misc/icu/source/tools/genuca/genuca.cpp misc/build/icu/source/tools/genuca/genuca.cpp
--- misc/icu/source/tools/genuca/genuca.cpp	2009-07-01 20:50:40.000000000 +0200
+++ misc/build/icu/source/tools/genuca/genuca.cpp	2024-06-14 21:27:57.031211233 +0200
@@ -395,7 +395,7 @@
                        copyright, status);
 
     if(U_FAILURE(*status)) {
-        fprintf(stderr, "Error: unable to create %s"INVC_DATA_NAME", error %s\n", outputDir, u_errorName(*status));
+        fprintf(stderr, "Error: unable to create %s" INVC_DATA_NAME ", error %s\n", outputDir, u_errorName(*status));
         return;
     }
 
@@ -757,7 +757,7 @@
                        copyright, status);
 
     if(U_FAILURE(*status)) {
-        fprintf(stderr, "Error: unable to create %s"UCA_DATA_NAME", error %s\n", outputDir, u_errorName(*status));
+        fprintf(stderr, "Error: unable to create %s" UCA_DATA_NAME ", error %s\n", outputDir, u_errorName(*status));
         return;
     }
 
@@ -904,9 +904,9 @@
       {0x20000, 0x2A6D6, UCOL_SPECIAL_FLAG | (CJK_IMPLICIT_TAG << 24)  },  //6 CJK_IMPLICIT_TAG,   /* 0x20000-0x2A6D6*/
       {0x2F800, 0x2FA1D, UCOL_SPECIAL_FLAG | (CJK_IMPLICIT_TAG << 24)  },  //7 CJK_IMPLICIT_TAG,   /* 0x2F800-0x2FA1D*/
 #endif
-      {0xAC00, 0xD7B0, UCOL_SPECIAL_FLAG | (HANGUL_SYLLABLE_TAG << 24) },  //0 HANGUL_SYLLABLE_TAG,/* AC00-D7AF*/
+      {0xAC00, 0xD7B0, static_cast<int32_t>(UCOL_SPECIAL_FLAG | (HANGUL_SYLLABLE_TAG << 24)) },  //0 HANGUL_SYLLABLE_TAG,/* AC00-D7AF*/
       //{0xD800, 0xDC00, UCOL_SPECIAL_FLAG | (LEAD_SURROGATE_TAG << 24)  },  //1 LEAD_SURROGATE_TAG,  /* D800-DBFF*/
-      {0xDC00, 0xE000, UCOL_SPECIAL_FLAG | (TRAIL_SURROGATE_TAG << 24) },  //2 TRAIL_SURROGATE DC00-DFFF
+      {0xDC00, 0xE000, static_cast<int32_t>(UCOL_SPECIAL_FLAG | (TRAIL_SURROGATE_TAG << 24)) },  //2 TRAIL_SURROGATE DC00-DFFF
       // Now directly handled in the collation code by the swapCJK function. 
       //{0x3400, 0x4DB6, UCOL_SPECIAL_FLAG | (CJK_IMPLICIT_TAG << 24)    },  //3 CJK_IMPLICIT_TAG,   /* 0x3400-0x4DB5*/
       //{0x4E00, 0x9FA6, UCOL_SPECIAL_FLAG | (CJK_IMPLICIT_TAG << 24)    },  //4 CJK_IMPLICIT_TAG,   /* 0x4E00-0x9FA5*/

--- misc/icu/source/configure	2009-07-01 14:51:26.000000000 -0400
+++ misc/build/icu/source/configure	2024-10-19 16:35:02.000000000 -0400
@@ -7061,8 +7061,10 @@
 	# Check for potential -arch flags.  It is not universal unless
 	# there are some -arch flags.  Note that *ppc* also matches
 	# ppc64.  This check is also rather less than ideal.
+	echo "${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}"
 	case "${CC} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS}" in  #(
-	  *-arch*ppc*|*-arch*i386*|*-arch*x86_64*) ac_cv_c_bigendian=universal;;
+	  *-arch*i386*|*-arch*x86_64*) ac_cv_c_bigendian=no;;
+	  *-arch*ppc*) ac_cv_c_bigendian=yes;;
 	esac
 else
   $as_echo "$as_me: failed program was:" >&5
--- misc/icu/source/i18n/uspoof.cpp	2009-07-01 14:50:10.000000000 -0400
+++ misc/build/icu/source/i18n/uspoof.cpp	2024-10-19 16:36:44.000000000 -0400
@@ -366,7 +366,7 @@
         // u_strToUTF8() in preflight mode is an easy way to do it.
         U_ASSERT(position16 <= len16);
         u_strToUTF8(NULL, 0, position, text16, position16, status);
-        if (position > 0) {
+        if (position) {
             // position is the required buffer length from u_strToUTF8, which includes
             // space for a terminating NULL, which we don't want, hence the -1.
             *position -= 1;