diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
index f9263756e..e361b2b6a 100644
--- a/.github/workflows/builds.yml
+++ b/.github/workflows/builds.yml
@@ -3,10 +3,10 @@ name: builds
 on:
   push:
     paths-ignore:
-      - '**.md'
+      - "**.md"
   pull_request:
     paths-ignore:
-      - '**.md'
+      - "**.md"
 
 jobs:
   build-windows-2022:
@@ -33,6 +33,36 @@ jobs:
           call "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvarsall.bat" x64
           call build "${{ matrix.target }}" "${{ matrix.compiler }}" "${{ matrix.mode }}" || exit /b 1
 
+  build-ubuntu:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        target:
+          - raddbg
+          # - radlink TODO
+          # - rdi_from_pdb TODO
+          # - rdi_from_dwarf TODO
+          # - rdi_breakpad_from_pdb TODO
+          - ryan_scratch
+        compiler:
+          - gcc
+          - clang
+        mode:
+          - debug
+          - release
+    steps:
+      - name: checkout
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential clang libx11-dev libxext-dev libfreetype-dev libgl-dev libegl-dev
+
+      - name: build (ubuntu)
+        run: |
+          bash build.sh ${{ matrix.target }} ${{ matrix.compiler }} ${{ matrix.mode }}
+
   run-torture:
     runs-on: windows-2022
     steps:
diff --git a/build.sh b/build.sh
index f7ea61395..d88128c5e 100644
--- a/build.sh
+++ b/build.sh
@@ -24,7 +24,7 @@ clang_debug="$compiler -g -O0 -DBUILD_DEBUG=1 ${clang_common} ${auto_compile_fla
 clang_release="$compiler -g -O2 -DBUILD_DEBUG=0 ${clang_common} ${auto_compile_flags}"
 clang_link="-lpthread -lm -lrt -ldl"
 clang_out="-o"
-gcc_common="-I../src/ -I../local/ -g -DBUILD_GIT_HASH=\"$git_hash\" -DBUILD_GIT_HASH_FULL=\"$git_hash_full\" -Wno-unknown-warning-option -Wall -Wno-missing-braces -Wno-unused-function -Wno-attributes -Wno-unused-value -Wno-unused-variable -Wno-unused-local-typedef -Wno-deprecated-declarations -Wno-unused-but-set-variable -Wno-compare-distinct-pointer-types -D_USE_MATH_DEFINES -Dstrdup=_strdup -Dgnu_printf=printf"
+gcc_common="-I../src/ -I/usr/include/freetype2/ -I../local/ -g -DBUILD_GIT_HASH=\"$git_hash\" -DBUILD_GIT_HASH_FULL=\"$git_hash_full\" -Wno-unknown-warning-option -Wall -Wno-missing-braces -Wno-unused-function -Wno-attributes -Wno-unused-value -Wno-unused-variable -Wno-unused-local-typedef -Wno-deprecated-declarations -Wno-unused-but-set-variable -Wno-compare-distinct-pointer-types -D_USE_MATH_DEFINES -Dstrdup=_strdup -Dgnu_printf=printf"
 gcc_debug="$compiler -g -O0 -DBUILD_DEBUG=1 ${gcc_common} ${auto_compile_flags}"
 gcc_release="$compiler -g -O2 -DBUILD_DEBUG=0 ${gcc_common} ${auto_compile_flags}"
 gcc_link="-lpthread -lm -lrt -ldl"