diff --git a/.github/scripts/build-headers.sh b/.github/scripts/build-headers.sh
new file mode 100755
index 00000000000..da4b339d46c
--- /dev/null
+++ b/.github/scripts/build-headers.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -eu #Needed so CI fails when anything is wrong
+set -x
+
+#Any arguments are passed to configure
+
+cd src
+./autogen.sh
+./configure "$@" --disable-check-runtime-deps --enable-werror
+make headers
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d04b5052449..f943a1152a9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -217,9 +217,12 @@ jobs:
     - name: Install dependencies
       run: |
         set -x
-        .github/scripts/use-main-ubuntu-mirror.sh
-        sudo apt-get -q update
+        .github/scripts/install-deps.sh
         sudo apt-get --yes install cppcheck
+    - name: Build headers
+      run: |
+        set -x
+        .github/scripts/build-headers.sh --with-realtime=uspace
     - name: Cppcheck
       run: |
         set -x
diff --git a/src/hal/classicladder/classicladder_gtk.c b/src/hal/classicladder/classicladder_gtk.c
index b78690638d5..85a46c33a6b 100644
--- a/src/hal/classicladder/classicladder_gtk.c
+++ b/src/hal/classicladder/classicladder_gtk.c
@@ -1059,7 +1059,7 @@ void MainSectionWindowInitGtk()
 
 
 //no more used since menu/toolbar added...
-#ifdef AAAAAAAAAAAAAAAAAAAAAA
+#if 0
 	hboxbottom = gtk_hbox_new (FALSE,0);
 	gtk_container_add (GTK_CONTAINER (vbox), hboxbottom);
 	gtk_widget_show(hboxbottom);
diff --git a/src/hal/classicladder/drawing.c b/src/hal/classicladder/drawing.c
index 9a6f65b363f..35d24d39b01 100644
--- a/src/hal/classicladder/drawing.c
+++ b/src/hal/classicladder/drawing.c
@@ -352,7 +352,7 @@ void DrawElement( cairo_t * cr,int x,int y,int Width,int Height,StrElement Eleme
 	char DisplayColorState = ( DrawingOption==DRAW_NORMAL && !EditDatas.ModeEdit && InfosGene->LadderState==STATE_RUN );
 
 //Cairo....
-#ifdef AAAAAAAAAAAAA
+#if 0
 	GdkGC * DynaGcOff;
 	GdkGC * TheGc;
 	GdkColor DynaGdkColor;
diff --git a/src/hal/classicladder/vars_names.c b/src/hal/classicladder/vars_names.c
index 97f569ea617..6fae792db71 100644
--- a/src/hal/classicladder/vars_names.c
+++ b/src/hal/classicladder/vars_names.c
@@ -42,7 +42,7 @@
 //===OLD CODE NO MORE USED===
 //with names directly in it...
 //to be deleted, but some precise errors codes aren't present in the new function...
-#ifdef AAAAAAAAA
+#if 0
 
 char * CreateVarName(int Type, int Offset)
 {