improve the ci script

.gitlab-ci.yml

@@ -3,8 +3,12 @@ before_script: &before
   - duneci-install-module https://gitlab.dune-project.org/extensions/dune-alugrid.git
   - duneci-install-module https://gitlab.dune-project.org/extensions/dune-foamgrid.git
   - duneci-install-module https://gitlab.dune-project.org/extensions/dune-vtk.git
-  - git config --global url."https://ci:${NANOFLANN_ACCESS_TOKEN}@gitlab.dune-project.org/simon.praetorius/nanoflann.git".insteadOf https://github.com/jlblancoc/nanoflann.git
-  - git clone https://ci:${ALGLIB_ACCESS_TOKEN}@gitlab.dune-project.org/simon.praetorius/alglib.git /duneci/libs/alglib
+  - git clone https://ci:${NANOFLANN_ACCESS_TOKEN}@gitlab.dune-project.org/simon.praetorius/nanoflann.git /tmp/nanoflann
+  - cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_CXX_STANDARD=20 -DCMAKE_CXX_COMPILER=g++-12 -DCMAKE_INSTALL_PREFIX=/duneci/lib/nanoflann -B /tmp/nanoflann-build -S /tmp/nanoflann
+  - cmake --build /tmp/nanoflann-build && cmake --install /tmp/nanoflann-build
+  - git clone https://ci:${ALGLIB_ACCESS_TOKEN}@gitlab.dune-project.org/simon.praetorius/alglib.git /tmp/alglib
+  - cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_CXX_STANDARD=20 -DCMAKE_CXX_COMPILER=g++-12 -DCMAKE_INSTALL_PREFIX=/duneci/lib/alglib -B /tmp/alglib-build -S /tmp/alglib
+  - cmake --build /tmp/alglib-build && cmake --install /tmp/alglib-build
 
 
 #  Test with the master branch of the dependencies
@@ -13,7 +17,7 @@ dune:git gcc-12 C++20:
   image: registry.dune-project.org/docker/ci/dune:git-debian-12-gcc-12-20
   tags: [duneci]
   variables:
-    DUNECI_CMAKE_FLAGS: -Dalglib_SOURCE_DIR=/duneci/libs/alglib
+    DUNECI_CMAKE_FLAGS: -Dalglib_DIR=/duneci/libs/alglib/share/cmake/alglib -Dnanoflann_DIR=/duneci/libs/nanoflann/share/cmake/nanoflann
   before_script:
   - *before
   script: duneci-standard-test