diff --git a/.github/workflows/ci-build.yml b/.github/workflows/ci-build.yml
index 2c7561423f..ec5d35e52c 100644
--- a/.github/workflows/ci-build.yml
+++ b/.github/workflows/ci-build.yml
@@ -34,6 +34,7 @@ jobs:
           autoconf \
           automake \
           libtool \
+          gperf \
           libharfbuzz-dev \
           libicu-dev \
           # EOF
diff --git a/os/emscripten/README.md b/os/emscripten/README.md
index 7cd818c7d6..488fe92a72 100644
--- a/os/emscripten/README.md
+++ b/os/emscripten/README.md
@@ -2,11 +2,11 @@
 
 Building with Emscripten works with emsdk 3.0.0 and above.
 
-You will also need autoconf, libharfbuzz-dev, and libicu-dev installed on your host OS.
+You will also need libharfbuzz-dev and libicu-dev installed on your host OS.
 
 
 ```
-  sudo apt-get install autoconf automake libtool libharfbuzz-dev libicu-dev
+  sudo apt-get install autoconf automake libtool gperf libharfbuzz-dev libicu-dev
 
   ./emscripten-build.sh
 ```