diff --git a/.github/workflows/build.sh b/.github/workflows/build.sh
index 212a313f..d415b203 100755
--- a/.github/workflows/build.sh
+++ b/.github/workflows/build.sh
@@ -1,5 +1,4 @@
-set -e o pipefail
-source .github/workflows/gh_ci_envvars.sh
+set -x -e o pipefail
 
 
 GH_MYMAKE_ARGS="-fPIC"
@@ -32,5 +31,6 @@ elif [[ "$GH_BUILDSYS" == "mymake" ]]; then
   ./mymake $GH_MYMAKE_ARGS
   mv hyper hyperrogue
 else
-  exit 'unknown build system'
+  echo 'unknown build system'
+  exit 1
 fi
diff --git a/.github/workflows/github_ci.yml b/.github/workflows/github_ci.yml
index 55b9cc1a..5127f76d 100644
--- a/.github/workflows/github_ci.yml
+++ b/.github/workflows/github_ci.yml
@@ -8,6 +8,7 @@ on:
 
 jobs:
   main_matrix:
+    name: Unix
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -18,36 +19,40 @@ jobs:
         hyper_use_rviz: [rviz_1, rviz_0]
         hyper_use_png: [png_1]
         hyper_use_glew: [glew_1]
+    env:
+      GH_OS: ${{ matrix.os }}
+      GH_COMPILER: ${{ matrix.compiler }}
+      GH_BUILDSYS: ${{ matrix.build_system }}
+      GH_HYP_RVIZ: ${{ matrix.hyper_use_rviz }}
+      GH_HYP_PNG: ${{ matrix.hyper_use_png }}
+      GH_HYP_GLEW: ${{ matrix.hyper_use_glew }}
     steps:
     - uses: actions/checkout@v2
-    - name: envvars_setup
-      run: |
-        cat << ENDOFVARS > .github/workflows/gh_ci_envvars.sh
-        GH_OS=${{ matrix.os }}
-        GH_COMPILER=${{ matrix.compiler }}
-        GH_BUILDSYS=${{ matrix.build_system }}
-        GH_HYP_RVIZ=${{ matrix.hyper_use_rviz }}
-        GH_HYP_PNG=${{ matrix.hyper_use_png }}
-        GH_HYP_GLEW=${{ matrix.hyper_use_glew }}
-        ENDOFVARS
-    - name: install_deps
+    - name: Install build dependencies
       run: .github/workflows/install_deps.sh
-    - name: build
+    - name: Build
       run: .github/workflows/build.sh
-    - name: test_simple
+    - name: Do a simple test
       run: .github/workflows/test_simple.sh
 
   windows:
-    runs-on: ${{ matrix.os }}
+    name: Windows
+    runs-on: windows-latest
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-latest]
         compiler: [gcc]
-        build_system: [makefile, autotools]
+        build_system: [makefile, autotools, mymake]
         hyper_use_rviz: [rviz_1, rviz_0]
         hyper_use_png: [png_1]
         hyper_use_glew: [glew_1]
+    env:
+      GH_OS: windows-latest
+      GH_COMPILER: ${{ matrix.compiler }}
+      GH_BUILDSYS: ${{ matrix.build_system }}
+      GH_HYP_RVIZ: ${{ matrix.hyper_use_rviz }}
+      GH_HYP_PNG: ${{ matrix.hyper_use_png }}
+      GH_HYP_GLEW: ${{ matrix.hyper_use_glew }}
     defaults:
       run:
         shell: msys2 {0}
@@ -57,32 +62,22 @@ jobs:
         update: true
         install: 'pactoys'
     - uses: actions/checkout@v2
-    - name: envvars_setup
-      run: |
-        cat << ENDOFVARS > .github/workflows/gh_ci_envvars.sh
-        GH_OS=${{ matrix.os }}
-        GH_COMPILER=${{ matrix.compiler }}
-        GH_BUILDSYS=${{ matrix.build_system }}
-        GH_HYP_RVIZ=${{ matrix.hyper_use_rviz }}
-        GH_HYP_PNG=${{ matrix.hyper_use_png }}
-        GH_HYP_GLEW=${{ matrix.hyper_use_glew }}
-        ENDOFVARS
-    - name: install_deps
+    - name: Install build dependencies
       env:
         MSYSTEM: MSYS
       run: .github/workflows/install_deps.sh
-    - name: build
+    - name: Build
       run: .github/workflows/build.sh
-    - name: test_simple
+    - name: Do a simple test
       run: .github/workflows/test_simple.sh
 
   emscripten:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
-    - name: build
+    - name: Build
       run: |
         docker run --rm -v $(pwd):/src trzeci/emscripten make -f Makefile.simple emscripten
-    - name: test_simple
+    - name: Do a simple test
       run: |
         ls -lAF hyper.html hyper.js hyper.wasm
diff --git a/.github/workflows/install_deps.sh b/.github/workflows/install_deps.sh
index 5777f8a9..c2048157 100755
--- a/.github/workflows/install_deps.sh
+++ b/.github/workflows/install_deps.sh
@@ -1,10 +1,9 @@
-set -e o pipefail
-source .github/workflows/gh_ci_envvars.sh
+set -x -e o pipefail
 
 
 GH_DEPS_UBUNTU="$GH_COMPILER libsdl1.2-dev libsdl-ttf2.0-dev libsdl-gfx1.2-dev libsdl-mixer1.2-dev"
 GH_DEPS_MACOS="sdl sdl_gfx sdl_mixer sdl_ttf"
-GH_DEPS_MINGW64="$GH_COMPILER:x SDL:x SDL_ttf:x SDL_gfx:x SDL_mixer:x make"
+GH_DEPS_MINGW64="$GH_COMPILER:x SDL:x SDL_ttf:x SDL_gfx:x SDL_mixer:x make gdb:x"
 
 if [[ "$GH_HYP_GLEW" == "glew_1" ]]; then
   GH_DEPS_UBUNTU+=" libglew-dev"
@@ -36,5 +35,6 @@ elif [[ "$GH_OS" == "windows-latest" ]]; then
   pacboy -Sy --noconfirm --needed $GH_DEPS_MINGW64
   sed -i'.orig' 's/<SDL.h>/"SDL.h"/' /mingw64/include/SDL/SDL_gfxPrimitives.h
 else
-  exit 'unknown OS'
+  echo 'unknown OS'
+  exit 1
 fi
diff --git a/.github/workflows/test_simple.sh b/.github/workflows/test_simple.sh
index 5627fa59..c10070f0 100755
--- a/.github/workflows/test_simple.sh
+++ b/.github/workflows/test_simple.sh
@@ -1,5 +1,14 @@
-set -e o pipefail
-source .github/workflows/gh_ci_envvars.sh
+set -x -e o pipefail
 
 
-./hyperrogue --version
\ No newline at end of file
+if [[ "$GH_OS" == "windows-latest" && "$GH_BUILDSYS" == "mymake" ]]; then
+
+cat << ENDOFCMDS > .github/workflows/gdb_cmds.txt
+  run --version
+  backtrace
+ENDOFCMDS
+
+  gdb --batch -x .github/workflows/gdb_cmds.txt ./hyperrogue
+else
+  ./hyperrogue --version
+fi