diff --git a/ports/boost-build/0003-fix-emscripten.patch b/ports/boost-build/0003-fix-emscripten.patch
new file mode 100644
index 00000000000000..1de8a56a997019
--- /dev/null
+++ b/ports/boost-build/0003-fix-emscripten.patch
@@ -0,0 +1,32 @@
+diff --git a/src/tools/emscripten.jam b/src/tools/emscripten.jam
+index d6594c5e43..8b15d0af96 100644
+--- a/src/tools/emscripten.jam
++++ b/src/tools/emscripten.jam
+@@ -6,6 +6,7 @@
+ import feature ;
+ import os ;
+ import toolset ;
++import generators ;
+ import common ;
+ import gcc ;
+ import type ;
+@@ -37,6 +38,9 @@ rule init ( version ? :  command * : options * )
+ 
+ feature.extend toolset : emscripten ;
+ 
++generators.override builtin.lib-generator : emscripten.prebuilt ;
++generators.override emscripten.searched-lib-generator : searched-lib-generator ;
++
+ toolset.inherit-generators emscripten <toolset>emscripten
+     : gcc
+     : gcc.mingw.link gcc.mingw.link.dll gcc.compile.c.pch gcc.compile.c++.pch
+@@ -53,7 +57,7 @@ toolset.inherit-flags emscripten : gcc
+ 
+ type.set-generated-target-suffix EXE : <toolset>emscripten : "js" ;
+ type.set-generated-target-suffix OBJ : <toolset>emscripten : "bc" ;
+-type.set-generated-target-suffix STATIC_LIB : <toolset>emscripten : "bc" ;
++type.set-generated-target-suffix STATIC_LIB : <toolset>emscripten : "a" ;
+ 
+ toolset.flags emscripten.compile OPTIONS <flags> ;
+ toolset.flags emscripten.compile OPTIONS <cflags> ;
+ 
\ No newline at end of file
diff --git a/ports/boost-build/portfile.cmake b/ports/boost-build/portfile.cmake
index eeabf4a69b7596..2abfad2c7bb489 100644
--- a/ports/boost-build/portfile.cmake
+++ b/ports/boost-build/portfile.cmake
@@ -14,6 +14,7 @@ vcpkg_from_github(
     HEAD_REF master
     PATCHES
         0002-fix-get-version.patch
+        0003-fix-emscripten.patch
 )
 
 vcpkg_download_distfile(ARCHIVE
diff --git a/ports/boost-build/vcpkg.json b/ports/boost-build/vcpkg.json
index 0ca87d542a01eb..65a76579813d0c 100644
--- a/ports/boost-build/vcpkg.json
+++ b/ports/boost-build/vcpkg.json
@@ -2,7 +2,7 @@
   "$comment": "Automatically generated by scripts/boost/generate-ports.ps1",
   "name": "boost-build",
   "version": "1.81.0",
-  "port-version": 1,
+  "port-version": 2,
   "description": "Boost.Build",
   "homepage": "https://github.com/boostorg/build",
   "license": "BSL-1.0",
diff --git a/ports/boost-modular-build-helper/boost-modular-build.cmake b/ports/boost-modular-build-helper/boost-modular-build.cmake
index 66ca39063a3357..6b61bd6eff05fe 100644
--- a/ports/boost-modular-build-helper/boost-modular-build.cmake
+++ b/ports/boost-modular-build-helper/boost-modular-build.cmake
@@ -54,8 +54,8 @@ function(boost_modular_build)
     else()
         set(BOOST_LIB_PREFIX lib)
         if(VCPKG_TARGET_ARCHITECTURE STREQUAL "wasm32")
-            set(BOOST_LIB_RELEASE_SUFFIX .bc)
-            set(BOOST_LIB_DEBUG_SUFFIX .bc)
+            set(BOOST_LIB_RELEASE_SUFFIX .a)
+            set(BOOST_LIB_DEBUG_SUFFIX .a)
         elseif(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
             set(BOOST_LIB_RELEASE_SUFFIX .a)
             set(BOOST_LIB_DEBUG_SUFFIX .a)
@@ -147,30 +147,6 @@ function(boost_modular_build)
             "${CURRENT_PACKAGES_DIR}/debug/bin/*.pyd"
     )
 
-    if(VCPKG_TARGET_ARCHITECTURE STREQUAL "wasm32")
-        # install .bc files
-        file(GLOB WASM_LIBS_RELEASE "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-rel/boost/build/*/${BOOST_LIB_PREFIX}*${BOOST_LIB_RELEASE_SUFFIX}")
-        file(GLOB WASM_LIBS_DEBUG "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-dbg/boost/build/*/${BOOST_LIB_PREFIX}*${BOOST_LIB_DEBUG_SUFFIX}")
-        file(COPY ${WASM_LIBS_RELEASE} DESTINATION "${CURRENT_PACKAGES_DIR}/lib")
-        file(COPY ${WASM_LIBS_DEBUG} DESTINATION "${CURRENT_PACKAGES_DIR}/debug/lib")
-
-        # rename .bc to .a
-        file(GLOB WASM_LIBS_RELEASE "${CURRENT_PACKAGES_DIR}/lib/*.bc")
-        file(GLOB WASM_LIBS_DEBUG "${CURRENT_PACKAGES_DIR}/debug/lib/*.bc")
-        foreach(LIB IN LISTS WASM_LIBS_RELEASE)
-            get_filename_component(OLD_FILENAME ${LIB} NAME)
-            get_filename_component(DIRECTORY_OF_LIB_FILE ${LIB} DIRECTORY)
-            string(REPLACE ".bc" ".a" NEW_FILENAME ${OLD_FILENAME})
-            file(RENAME ${LIB} ${DIRECTORY_OF_LIB_FILE}/${NEW_FILENAME})
-        endforeach()
-        foreach(LIB IN LISTS WASM_LIBS_DEBUG)
-            get_filename_component(OLD_FILENAME ${LIB} NAME)
-            get_filename_component(DIRECTORY_OF_LIB_FILE ${LIB} DIRECTORY)
-            string(REPLACE ".bc" ".a" NEW_FILENAME ${OLD_FILENAME})
-            file(RENAME ${LIB} ${DIRECTORY_OF_LIB_FILE}/${NEW_FILENAME})
-        endforeach()
-    endif()
-
     file(GLOB INSTALLED_LIBS "${CURRENT_PACKAGES_DIR}/debug/lib/*.lib" "${CURRENT_PACKAGES_DIR}/lib/*.lib")
     foreach(LIB IN LISTS INSTALLED_LIBS)
         get_filename_component(OLD_FILENAME ${LIB} NAME)
diff --git a/ports/boost-modular-build-helper/vcpkg.json b/ports/boost-modular-build-helper/vcpkg.json
index cf4a99cc1105b0..a2408243b13983 100644
--- a/ports/boost-modular-build-helper/vcpkg.json
+++ b/ports/boost-modular-build-helper/vcpkg.json
@@ -2,7 +2,7 @@
   "$comment": "Automatically generated by scripts/boost/generate-ports.ps1",
   "name": "boost-modular-build-helper",
   "version": "1.81.0",
-  "port-version": 2,
+  "port-version": 3,
   "description": "Internal vcpkg port used to build Boost libraries",
   "license": "MIT",
   "dependencies": [
diff --git a/versions/b-/boost-build.json b/versions/b-/boost-build.json
index e36b8b970864d0..65fc17a2b259a0 100644
--- a/versions/b-/boost-build.json
+++ b/versions/b-/boost-build.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "40cd5234db2baf10fb0a2b0ec8b40771910ca045",
+      "version": "1.81.0",
+      "port-version": 2
+    },
     {
       "git-tree": "e4e7001fc4602b7fc61c55acf2c3b641e79c7de7",
       "version": "1.81.0",
diff --git a/versions/b-/boost-modular-build-helper.json b/versions/b-/boost-modular-build-helper.json
index 2ed46951ce5b00..fb67920fd7fd26 100644
--- a/versions/b-/boost-modular-build-helper.json
+++ b/versions/b-/boost-modular-build-helper.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "d47cef023f39ac9d5f3a043d35cba1a74710e1b3",
+      "version": "1.81.0",
+      "port-version": 3
+    },
     {
       "git-tree": "99f9bc3d7c9ac2864942f3f8d80a3d8db4689794",
       "version": "1.81.0",
diff --git a/versions/baseline.json b/versions/baseline.json
index 68162b738439dd..5ce64f6647b78f 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -642,7 +642,7 @@
     },
     "boost-build": {
       "baseline": "1.81.0",
-      "port-version": 1
+      "port-version": 2
     },
     "boost-callable-traits": {
       "baseline": "1.81.0",
@@ -894,7 +894,7 @@
     },
     "boost-modular-build-helper": {
       "baseline": "1.81.0",
-      "port-version": 2
+      "port-version": 3
     },
     "boost-move": {
       "baseline": "1.81.0",