diff --git a/.github/workflows/centos.yml b/.github/workflows/centos.yml
index 8ff24000bb2..35ccf7fba3d 100644
--- a/.github/workflows/centos.yml
+++ b/.github/workflows/centos.yml
@@ -109,11 +109,13 @@ jobs:
             -DBUILD_DOTNET=${{ matrix.dotnet }} \
             -DBUILD_EXAMPLES=ON \
             -DBUILD_DEPS=ON \
-            -DUSE_SIRIUS=${{ matrix.sirius }} \
-            -Dsirius_solver_DIR="${{ env.SIRIUS_CMAKE_DIR }}" \
             -DCMAKE_INSTALL_PREFIX="build/install" \
             -DBUILD_SAMPLES=OFF \
-            -DBUILD_FLATZINC=OFF
+            -DBUILD_FLATZINC=OFF \
+            -DUSE_SIRIUS=${{ matrix.sirius }} \
+            -Dsirius_solver_DIR="${{ env.SIRIUS_CMAKE_DIR }}" \
+            -DUSE_SCIP=ON \
+            -DUSE_GLPK=ON
 
       - name: Build OR-Tools Linux
         run: |
diff --git a/.github/workflows/oracle.yml b/.github/workflows/oracle.yml
index 804853cb059..5bfe0335733 100644
--- a/.github/workflows/oracle.yml
+++ b/.github/workflows/oracle.yml
@@ -134,7 +134,10 @@ jobs:
             -Dsirius_solver_DIR="${{ env.SIRIUS_CMAKE_DIR }}" \
             -DCMAKE_INSTALL_PREFIX="build/install" \
             -DBUILD_SAMPLES=OFF \
-            -DBUILD_FLATZINC=OFF
+            -DBUILD_FLATZINC=OFF \
+            -DUSE_SCIP=ON \
+            -DUSE_GLPK=ON
+
 
       - name: Build OR-Tools Linux
         run: |
diff --git a/.github/workflows/windows-cpp.yml b/.github/workflows/windows-cpp.yml
index 980bf98df6b..eae08a2aed7 100644
--- a/.github/workflows/windows-cpp.yml
+++ b/.github/workflows/windows-cpp.yml
@@ -69,6 +69,8 @@ jobs:
           -DBUILD_DEPS=ON
           -DCMAKE_INSTALL_PREFIX="install"
           -DBUILD_FLATZINC=OFF
+          -DUSE_SCIP=ON
+          -DUSE_GLPK=ON
 
       - name: Build
         run: >
diff --git a/.github/workflows/windows-java-dotnet.yml b/.github/workflows/windows-java-dotnet.yml
index 4fa1ee45695..274a8e80674 100644
--- a/.github/workflows/windows-java-dotnet.yml
+++ b/.github/workflows/windows-java-dotnet.yml
@@ -67,6 +67,8 @@ jobs:
           -DBUILD_SAMPLES=OFF
           -DCMAKE_INSTALL_PREFIX="install"
           -DBUILD_FLATZINC=OFF
+          -DUSE_SCIP=ON
+          -DUSE_GLPK=ON
 
       - name: Build
         run: >
diff --git a/.github/workflows/windows-python.yml b/.github/workflows/windows-python.yml
index 334229b516b..5f85bf49e54 100644
--- a/.github/workflows/windows-python.yml
+++ b/.github/workflows/windows-python.yml
@@ -75,6 +75,8 @@ jobs:
           -DBUILD_PYTHON=ON
           -DBUILD_SAMPLES=OFF
           -DBUILD_FLATZINC=OFF
+          -DUSE_SCIP=ON
+          -DUSE_GLPK=ON
 
       - name: Build
         run: >