diff --git a/build.html b/build.html
index 82c4c38..5b81fe5 100644
--- a/build.html
+++ b/build.html
@@ -32,6 +32,8 @@ select.large { font-size: large; }
     <select id="linuxSelect" onchange="onOsChanged(false)" class="large">
       <option>Choose a Linux distro:</option>
       <option>Alpine</option>
+      <option>CentOS 7</option>
+      <option>CentOS 8</option>
       <option>Debian 8</option>
       <option>Debian 9</option>
       <option>Debian 10</option>
@@ -174,7 +176,7 @@ function onOptionsChanged() {
   document.getElementById('buildCommandsDiv').style.display = 'block';
 
   var use_clang = os_freebsd || os_openbsd;
-  if (os_linux && linux_distro !== 'Alpine') {
+  if (os_linux && linux_distro !== 'Alpine' && !linux_distro.includes('CentOS')) {
     document.getElementById('buildCompilerDiv').style.display = 'block';
     use_clang = document.getElementById('buildCompilerRadioClang').checked;
   } else {
@@ -309,6 +311,7 @@ function onOptionsChanged() {
 
   var commands = [];
 
+  var cmake = 'cmake';
   if (os_mac) {
     commands.push('xcode-select --install');
     commands.push('/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"');
@@ -321,6 +324,21 @@ function onOptionsChanged() {
         var packages = 'alpine-sdk linux-headers git zlib-dev openssl-dev gperf cmake';
         commands.push(sudo + 'apk add --update ' + packages);
         break;
+      case 'CentOS 7':
+      case 'CentOS 8':
+        commands.push(sudo + 'yum update -y');
+        var packages = 'gcc-c++ make git zlib-devel openssl-devel';
+        if (linux_distro === 'CentOS 7') {
+          commands.push(sudo + 'yum install -y centos-release-scl-rh epel-release');
+          commands.push(sudo + 'yum install -y devtoolset-9-gcc devtoolset-9-gcc-c++');
+          cmake = 'cmake3';
+          packages += ' gperf';
+        } else {
+          commands.push(sudo + 'dnf --enablerepo=PowerTools install gperf');
+        }
+        packages += ' ' + cmake;
+        commands.push(sudo + 'yum install -y ' + packages);
+        break;
       case 'Debian 8':
       case 'Debian 9':
       case 'Debian 10':
@@ -463,19 +481,21 @@ function onOptionsChanged() {
         prefix = 'CC=/usr/bin/clang' + clang_version_suffix + ' CXX=/usr/bin/clang++' + clang_version_suffix + ' ';
       } else if (linux_distro === 'Ubuntu 14') {
         prefix = 'CC=/usr/bin/gcc-4.9 CXX=/usr/bin/g++-4.9 ';
+      } else if (linux_distro === 'CentOS 7') {
+        prefix = 'CC=/opt/rh/devtoolset-9/root/usr/bin/gcc CXX=/opt/rh/devtoolset-9/root/usr/bin/g++ ';
       }
     }
-    return prefix + 'cmake ' + options.join(' ') + ' ..';
+    return prefix + cmake + ' ' + options.join(' ') + ' ..';
   }
   commands.push(getCmakeInitCommand(cmake_init_options));
 
   if (os_openbsd) {
-    commands.push('cmake --build . --target prepare_cross_compiling');
+    commands.push(cmake + ' --build . --target prepare_cross_compiling');
     commands.push('cd ../td');
     commands.push('php-7.2 SplitSource.php');
     commands.push('cd ../build');
   }
-  let build_command = 'cmake --build . --target install';
+  let build_command = cmake + ' --build . --target install';
   if (use_msvc) {
     if (!is_debug_build) {
       commands.push(build_command + ' --config Release');
diff --git a/td b/td
index f9a600c..7a0b884 160000
--- a/td
+++ b/td
@@ -1 +1 @@
-Subproject commit f9a600c401ba20af7e07ee60e12b1de28dd2e14c
+Subproject commit 7a0b88441a980171624f4727fd5f52d9db078730