diff --git a/auto.def b/auto.def
index 759cf07fe0..4871a98229 100644
--- a/auto.def
+++ b/auto.def
@@ -12,7 +12,7 @@
 #
 # JimTCL: https://jim.tcl.tk
 #
-use cc cc-db cc-shared cc-lib proj
+use cc cc-db cc-shared cc-lib proj pkg-config
 
 # $DUMP_DEFINES_TXT is the file emitted by --dump-defines, intended
 # only for build debugging and not part of the public build interface.
@@ -184,7 +184,7 @@ set flags {
                         => {Enable SQLITE_ENABLE_ICU and add the given linker flags for the ICU libraries}
   with-icu-cflags:CFLAGS
                         => {Apply extra CFLAGS/CPPFLAGS necessary for building with ICU. e.g. -I/usr/local/include}
-  with-icu-config:=auto => {Enable SQLITE_ENABLE_ICU and fetch ldflags and cflags flags from the given icu-config binary}
+  with-icu-config:=auto => {Enable SQLITE_ENABLE_ICU. Value must be one of: auto, pkg-config, /path/to/icu-config}
   icu-collations=0      => {Enable SQLITE_ENABLE_ICU_COLLATIONS. Requires --with-icu-ldflags=... or --with-icu-config}
   # </icu>
   # <alternative-builds>
@@ -1126,20 +1126,26 @@ proj-if-opt-truthy math {
 #
 #  --with-icu-ldflags=LDFLAGS
 #  --with-icu-cflags=CFLAGS
-#  --with-icu-config[=/path/to/icu-config]
+#  --with-icu-config[=auto | pkg-config | /path/to/icu-config]
 #  --enable-icu-collations
 #
-# If --with-icu-config is provided but icu-config cannot be used fail
-# fatally. If --with-icu-ldflags/cflags is/are provided, assume they
-# are valid.
+# --with-icu-config values:
 #
-# If --with-icu-ldflags/cflags and --with-icu-config are provided,
-# they are cumulative.  If neither are provided, icu-collations is not
+#   - auto: use the first one of (pkg-config, icu-config) found on the
+#     system.
+#   - pkg-config: use only pkg-config to determine flags
+#   - /path/to/icu-config: use that to determine flags
+#
+# If --with-icu-config is used as neither pkg-config nor icu-config
+# are found, fail fatally.
+#
+# If both --with-icu-ldflags and --with-icu-config are provided, they
+# are cumulative.  If neither are provided, icu-collations is not
 # honored and a warning is emitted if it is provided.
 #
 # Design note: though we can automatically enable ICU if the
-# icu-config binary is found, we specifically do not. ICU is always an
-# opt-in feature.
+# icu-config binary or (pkg-config icu-io) are found, we specifically
+# do not. ICU is always an opt-in feature.
 #
 # Maintenance reminder: check-in 09caa94c9e84 added pkg-config support
 # to this but the result fails to link on both Linux and OpenBSD
@@ -1152,34 +1158,52 @@ proc sqlite-check-icu {} {
   # - -licui18n -licuuc -licudata
   # - -licui18n -licuuc
   # - /usr/local/bin/icu-config --ldflags
+  #
   if {[proj-opt-was-provided with-icu-config]} {
-    set bin [opt-val with-icu-config]
-    if {"auto" eq $bin} {
-      set bin [proj-first-bin-of \
-                 [get-define prefix]/bin/icu-config \
-                 /usr/local/bin/icu-config \
-                 /usr/bin/icu-config]
-      if {"" eq $bin} {
-        proj-fatal "--with-icu-config=auto cannot find icu-config binary"
+    set icuConfigBin [opt-val with-icu-config]
+    set tryIcuConfigBin 1; # set to 0 if we end up using pkg-config
+    if {"auto" eq $icuConfigBin || "pkg-config" eq $icuConfigBin} {
+      if {[pkg-config-init 0] && [pkg-config icu-io]} {
+        # Maintenance reminder: historical docs say to use both of
+        # (icu-io, icu-uc). icu-uc lacks a required lib and icu-io has
+        # all of them on tested OSes.
+        set tryIcuConfigBin 0
+        define LDFLAGS_ICU [get-define PKG_ICU_IO_LDFLAGS]
+        define-append LDFLAGS_ICU [get-define PKG_ICU_IO_LIBS]
+        define CFLAGS_ICU [get-define PKG_ICU_IO_CFLAGS]
+      } elseif {"pkg-config" eq $icuConfigBin} {
+        proj-fatal "pkg-config cannot find package icu-io"
+      } else {
+        proj-assert {"auto" eq $icuConfigBin}
       }
     }
-    if {[file-isexec $bin]} {
-      set x [exec $bin --ldflags]
-      if {"" eq $x} {
-        proj-fatal "$bin --ldflags returned no data"
+    if {$tryIcuConfigBin} {
+      if {"auto" eq $icuConfigBin} {
+        set icuConfigBin [proj-first-bin-of \
+                            /usr/local/bin/icu-config \
+                            /usr/bin/icu-config]
+        if {"" eq $icuConfigBin} {
+          proj-fatal "--with-icu-config=auto cannot find (pkg-config icu-io) or icu-config binary"
+        }
+      }
+      if {[file-isexec $icuConfigBin]} {
+        set x [exec $icuConfigBin --ldflags]
+        if {"" eq $x} {
+          proj-fatal "$icuConfigBin --ldflags returned no data"
+        }
+        define-append LDFLAGS_ICU $x
+        set x [exec $icuConfigBin --cppflags]
+        define-append CFLAGS_ICU $x
+      } else {
+        proj-fatal "--with-icu-config=$bin does not refer to an executable"
       }
-      define-append LDFLAGS_ICU $x
-      set x [exec $bin --cppflags]
-      define-append CFLAGS_ICU $x
-    } else {
-      proj-fatal "--with-icu-config=$bin does not refer to an executable"
     }
   }
   set ldflags [define LDFLAGS_ICU [string trim [get-define LDFLAGS_ICU]]]
   set cflags [define CFLAGS_ICU [string trim [get-define CFLAGS_ICU]]]
   if {"" ne $ldflags} {
     sqlite-add-feature-flag -shell -DSQLITE_ENABLE_ICU
-    msg-result "Enabling ICU support with libs ($ldflags) and cflags ($cflags)"
+    msg-result "Enabling ICU support with flags: $ldflags $cflags"
     if {[opt-bool icu-collations]} {
       msg-result "Enabling ICU collations."
       sqlite-add-feature-flag -shell -DSQLITE_ENABLE_ICU_COLLATIONS
diff --git a/manifest b/manifest
index 1ce6cea3c6..92cde3b804 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C configure\sscript\sdoc\sadditions\sfor\sthe\sICU\sfeature\scheck.
-D 2024-11-15T10:12:03.805
+C configure:\sadd\soptional\spkg-config\ssupport\sfor\sdetecting\sICU.
+D 2024-11-15T10:53:57.203
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md e108e1e69ae8e8a59e93c455654b8ac9356a11720d3345df2a4743e9590fb20d
@@ -13,7 +13,7 @@ F art/icon-80x90.gif 65509ce3e5f86a9cd64fe7fca2d23954199f31fe44c1e09e208c80fb83d
 F art/sqlite370.eps aa97a671332b432a54e1d74ff5e8775be34200c2
 F art/sqlite370.ico af56c1d00fee7cd4753e8631ed60703ed0fc6e90
 F art/sqlite370.jpg d512473dae7e378a67e28ff96a34da7cb331def2
-F auto.def dbbaf480acd0c5b9f330580aec6a43f50e5c37a69b1e5bb3f722c0620f617094
+F auto.def 538d9a162a8fe4811c0a4a22a2a07df40ea4c334f683b94231bfc2a18f14b913
 F autoconf/INSTALL 83e4a25da9fd053c7b3665eaaaf7919707915903
 F autoconf/Makefile.am adedc1324b6a87fdd1265ddd336d2fb7d4f36a0e77b86ea553ae7cc4ea239347
 F autoconf/Makefile.fallback 22fe523eb36dfce31e0f6349f782eb084e86a5620b2b0b4f84a2d6133f53f5ac
@@ -2198,8 +2198,9 @@ F tool/version-info.c 3b36468a90faf1bbd59c65fd0eb66522d9f941eedd364fabccd7227350
 F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee87c1b31a7
 F tool/warnings.sh 49a486c5069de041aedcbde4de178293e0463ae9918ecad7539eedf0ec77a139
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 81202d2ab5963fdcf20555b6d0b31cc955ac27f1cd87656faea5c0611c9a2ee8
-R f0c6d5bed8faeb01cfe709bf9d6cb9a1
+P 1925a68fc2323f0788aac9c3c2bb3005182eb3286037bc383181b6aa150d4270 6ca457542e1dceac2d68fe3d29ff1f0beb31a77ca3073bd7d8a6c62faabcdc1d
+R 02dd7c141e8d6d129c07207797697869
+T +closed 6ca457542e1dceac2d68fe3d29ff1f0beb31a77ca3073bd7d8a6c62faabcdc1d Closed\sby\sintegrate-merge.
 U stephan
-Z 5ff845a37175f10e9a57fde007423669
+Z 467aed797000c9f6ea51561768e3c8cb
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 1bd2038e40..1f254347f8 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-1925a68fc2323f0788aac9c3c2bb3005182eb3286037bc383181b6aa150d4270
+3e5b8077c6c6ce72ecab3110eb45943b9765372df789088982dbd6046a7c2523