Install gperf through vcpkg.

build.html

@@ -501,7 +501,6 @@
     pre_text.push('Download and install <a href="https://visualstudio.microsoft.com/vs/community/">Microsoft Visual Studio</a>. Enable C++' + win10_sdk + ' support while installing.');
     pre_text.push('Download and install <a href="https://cmake.org/download/">CMake</a>; choose "Add CMake to the system PATH" option while installing.');
     pre_text.push('Download and install <a href="https://git-scm.com/download/win">Git</a>.');
-    pre_text.push('Download and install <a href="https://sourceforge.net/projects/gnuwin32/files/gperf/3.0.1/">gperf</a>. Add the path to gperf.exe to the PATH environment variable.');
     pre_text.push('Download and unpack <a href="https://windows.php.net/download#php-7.2">PHP</a>. Add the path to php.exe to the PATH environment variable.');
     if (target === 'C++/CX') {
       switch (archiver) {
@@ -722,12 +721,12 @@
     commands.push('cd vcpkg');
     commands.push(local + 'bootstrap-vcpkg.bat');
     if (target === 'C++/CX') {
-      commands.push(local + 'vcpkg.exe install openssl-uwp:arm-uwp openssl-uwp:x64-uwp openssl-uwp:x86-uwp zlib:arm-uwp zlib:x64-uwp zlib:x86-uwp');
+      commands.push(local + 'vcpkg.exe install gperf openssl-uwp:arm-uwp openssl-uwp:x64-uwp openssl-uwp:x86-uwp zlib:arm-uwp zlib:x64-uwp zlib:x86-uwp');
     } else {
       if (build_64bit) {
-        commands.push(local + 'vcpkg.exe install openssl:x64-windows zlib:x64-windows');
+        commands.push(local + 'vcpkg.exe install gperf openssl:x64-windows zlib:x64-windows');
       } else {
-        commands.push(local + 'vcpkg.exe install openssl:x86-windows zlib:x86-windows');
+        commands.push(local + 'vcpkg.exe install gperf openssl:x86-windows zlib:x86-windows');
       }
     }
     commands.push('cd ..');