diff --git a/ortools/base/raw_logging.cc b/ortools/base/raw_logging.cc
index 2b60477324a..a0ba9a7ca16 100644
--- a/ortools/base/raw_logging.cc
+++ b/ortools/base/raw_logging.cc
@@ -26,14 +26,18 @@
 #include "ortools/base/log_severity.h"
 #include "ortools/base/logging_utilities.h"
 
-#if !defined(_MSC_VER)
+#if !defined(_MSC_VER) && !defined(__EMSCRIPTEN__)
 #include <sys/syscall.h>  // for syscall()
 #define safe_write(fd, s, len) syscall(SYS_write, fd, s, len)
 #else
+#if defined(__EMSCRIPTEN__)
+#define safe_write(fd, s, len) write(fd, s, len)
+#else
 #include <io.h>  // _write()
 // Not so safe, but what can you do?
 #define safe_write(fd, s, len) _write(fd, s, len)
 #endif
+#endif
 
 #if defined(_MSC_VER) && !defined(__MINGW32__)
 enum { STDIN_FILENO = 0, STDOUT_FILENO = 1, STDERR_FILENO = 2 };
diff --git a/tools/cross_compile.sh b/tools/cross_compile.sh
old mode 100755
new mode 100644
index 774396ecb87..20d433f2a1d
--- a/tools/cross_compile.sh
+++ b/tools/cross_compile.sh
@@ -265,6 +265,25 @@ QEMU_ARGS+=( -L "${SYSROOT_DIR}" )
 QEMU_ARGS+=( -E LD_PRELOAD="${SYSROOT_DIR}/usr/lib/libstdc++.so.6:${SYSROOT_DIR}/lib/libgcc_s.so.1" )
 }
 
+function expand_wasm_config() {
+  local -r EMSDK_VERSION=2.0.14
+  local -r EMSDK_URL=https://github.com/emscripten-core/emsdk/archive/${EMSDK_VERSION}.tar.gz 
+  local -r EMSDK_RELATIVE_DIR="emsdk-${EMSDK_VERSION}"
+  local -r EMSDK="${ARCHIVE_DIR}/${EMSDK_RELATIVE_DIR}"
+  if [ ! -d "${EMSDK}" ]; then
+    echo "Fetching emscripten"
+    unpack "${EMSDK_URL}" "${EMSDK_RELATIVE_DIR}"
+    echo "Installing Emscripten ..."
+    ${EMSDK}/emsdk install ${EMSDK_VERSION}
+
+    echo "Activating Emscripten ..."
+    ${EMSDK}/emsdk activate ${EMSDK_VERSION}
+  fi
+
+  declare -r TOOLCHAIN_FILE=${EMSDK}/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake
+  CMAKE_ADDITIONAL_ARGS+=( -DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN_FILE}" -DBUILD_SAMPLES=OFF -DBUILD_EXAMPLES=OFF -DBUILD_TESTING=OFF)
+}
+
 function build() {
   cd "${PROJECT_DIR}" || exit 2
   set -x
@@ -323,6 +342,7 @@ DESCRIPTION
 \t\tmips64 mips64el (codespace)
 \t\tppc (bootlin)
 \t\tppc64 ppc64le (bootlin)
+\t\twasm32 (emscripten)
 
 OPTIONS
 \t-h --help: show this help text
@@ -403,6 +423,9 @@ function main() {
     ppc)
       expand_bootlin_config
       declare -r QEMU_ARCH=ppc ;;
+    wasm32)
+      expand_wasm_config
+      declare -r QEMU_ARCH=DISABLED ;;
     *)
       >&2 echo "Unknown TARGET '${TARGET}'..."
       exit 1 ;;