diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 66b0e8d..7587f85 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,161 +17,35 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - toolset: gcc-4.8
-            cxxstd: "11"
-            os: ubuntu-latest
-            container: ubuntu:18.04
-            install: g++-4.8-multilib
-            address-model: 32,64
-          - toolset: gcc-5
-            cxxstd: "11,14,1z"
-            os: ubuntu-latest
-            container: ubuntu:18.04
-            install: g++-5-multilib
-            address-model: 32,64
-          - toolset: gcc-6
-            cxxstd: "11,14,1z"
-            os: ubuntu-latest
-            container: ubuntu:18.04
-            install: g++-6-multilib
-            address-model: 32,64
-          - toolset: gcc-7
-            cxxstd: "11,14,17"
-            os: ubuntu-20.04
-            install: g++-7-multilib
-            address-model: 32,64
-          - toolset: gcc-8
-            cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
-            install: g++-8-multilib
-            address-model: 32,64
-          - toolset: gcc-9
-            cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
-            install: g++-9-multilib
-            address-model: 32,64
-          - toolset: gcc-10
-            cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
-            install: g++-10-multilib
-            address-model: 32,64
-          - toolset: gcc-11
-            cxxstd: "11,14,17,20"
-            os: ubuntu-22.04
-            install: g++-11-multilib
-            address-model: 32,64
-          - toolset: gcc-12
-            cxxstd: "11,14,17,20,2b"
-            os: ubuntu-22.04
-            install: g++-12-multilib
-            address-model: 32,64
-          - toolset: gcc-13
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:23.04
-            os: ubuntu-latest
-            install: g++-13-multilib
-            address-model: 32,64
-          - toolset: gcc-14
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:24.04
-            os: ubuntu-latest
-            install: g++-14-multilib
-            address-model: 32,64
-          - toolset: clang
-            compiler: clang++-3.9
-            cxxstd: "11,14"
-            os: ubuntu-latest
-            container: ubuntu:18.04
-            install: clang-3.9
-          - toolset: clang
-            compiler: clang++-4.0
-            cxxstd: "11,14"
-            os: ubuntu-latest
-            container: ubuntu:18.04
-            install: clang-4.0
-          - toolset: clang
-            compiler: clang++-5.0
-            cxxstd: "11,14,1z"
-            os: ubuntu-latest
-            container: ubuntu:18.04
-            install: clang-5.0
-          - toolset: clang
-            compiler: clang++-6.0
-            cxxstd: "11,14,17"
-            os: ubuntu-20.04
-            install: clang-6.0
-          - toolset: clang
-            compiler: clang++-7
-            cxxstd: "11,14,17"
-            os: ubuntu-20.04
-            install: clang-7
-          - toolset: clang
-            compiler: clang++-8
-            cxxstd: "11,14,17"
-            os: ubuntu-20.04
-            install: clang-8
-          - toolset: clang
-            compiler: clang++-9
-            cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
-            install: clang-9
-          - toolset: clang
-            compiler: clang++-10
-            cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
-          - toolset: clang
-            compiler: clang++-11
-            cxxstd: "11,14,17,2a"
-            os: ubuntu-20.04
-          - toolset: clang
-            compiler: clang++-12
-            cxxstd: "11,14,17,20"
-            os: ubuntu-20.04
-          - toolset: clang
-            compiler: clang++-13
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:22.04
-            os: ubuntu-latest
-            install: clang-13
-          - toolset: clang
-            compiler: clang++-14
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:22.04
-            os: ubuntu-latest
-            install: clang-14
-          - toolset: clang
-            compiler: clang++-15
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:22.04
-            os: ubuntu-latest
-            install: clang-15
-          - toolset: clang
-            compiler: clang++-16
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:23.04
-            os: ubuntu-latest
-            install: clang-16
-          - toolset: clang
-            compiler: clang++-17
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:23.10
-            os: ubuntu-latest
-            install: clang-17
-          - toolset: clang
-            compiler: clang++-18
-            cxxstd: "11,14,17,20,2b"
-            container: ubuntu:24.04
-            os: ubuntu-latest
-            install: clang-18
-          - toolset: clang
-            cxxstd: "11,14,17,20,2b"
-            os: macos-12
-          - toolset: clang
-            cxxstd: "11,14,17,20,2b"
-            os: macos-13
-          - toolset: clang
-            cxxstd: "11,14,17,20,2b"
-            os: macos-14
+          - {toolset: gcc-4.8,     cxxstd: "11",             os: ubuntu-latest, container: ubuntu:18.04, install: g++-4.8-multilib, address-model: 32,64}
+          - {toolset: gcc-5,       cxxstd: "11,14,1z",       os: ubuntu-latest, container: ubuntu:18.04, install: g++-5-multilib, address-model: 32,64}
+          - {toolset: gcc-6,       cxxstd: "11,14,1z",       os: ubuntu-latest, container: ubuntu:18.04, install: g++-6-multilib, address-model: 32,64}
+          - {toolset: gcc-7,       cxxstd: "11,14,17",       os: ubuntu-20.04, install: g++-7-multilib, address-model: 32,64}
+          - {toolset: gcc-8,       cxxstd: "11,14,17,2a",    os: ubuntu-20.04, install: g++-8-multilib, address-model: 32,64}
+          - {toolset: gcc-9,       cxxstd: "11,14,17,2a",    os: ubuntu-20.04, install: g++-9-multilib, address-model: 32,64}
+          - {toolset: gcc-10,      cxxstd: "11,14,17,2a",    os: ubuntu-20.04, install: g++-10-multilib, address-model: 32,64}
+          - {toolset: gcc-11,      cxxstd: "11,14,17,20",    os: ubuntu-22.04, install: g++-11-multilib, address-model: 32,64}
+          - {toolset: gcc-12,      cxxstd: "11,14,17,20,2b", os: ubuntu-22.04, install: g++-12-multilib, address-model: 32,64}
+          - {toolset: gcc-13,      cxxstd: "11,14,17,20,2b", container: ubuntu:23.04, os: ubuntu-latest, install: g++-13-multilib, address-model: 32,64}
+          - {toolset: gcc-14,      cxxstd: "11,14,17,20,2b", container: ubuntu:24.04, os: ubuntu-latest, install: g++-14-multilib, address-model: 32,64}
+          - {toolset: clang++-3.9, cxxstd: "11,14",          os: ubuntu-latest, container: ubuntu:18.04, install: clang-3.9}
+          - {toolset: clang++-4.0, cxxstd: "11,14",          os: ubuntu-latest, container: ubuntu:18.04, install: clang-4.0}
+          - {toolset: clang++-5.0, cxxstd: "11,14,1z",       os: ubuntu-latest, container: ubuntu:18.04, install: clang-5.0}
+          - {toolset: clang++-6.0, cxxstd: "11,14,17",       os: ubuntu-20.04, install: clang-6.0}
+          - {toolset: clang++-7,   cxxstd: "11,14,17",       os: ubuntu-20.04, install: clang-7}
+          - {toolset: clang++-8,   cxxstd: "11,14,17",       os: ubuntu-20.04, install: clang-8}
+          - {toolset: clang++-9,   cxxstd: "11,14,17,2a",    os: ubuntu-20.04, install: clang-9}
+          - {toolset: clang++-10,  cxxstd: "11,14,17,2a",    os: ubuntu-20.04}
+          - {toolset: clang++-11,  cxxstd: "11,14,17,2a",    os: ubuntu-20.04}
+          - {toolset: clang++-12,  cxxstd: "11,14,17,20",    os: ubuntu-20.04}
+          - {toolset: clang++-13,  cxxstd: "11,14,17,20,2b", os: ubuntu-22.04, install: clang-13}
+          - {toolset: clang++-14,  cxxstd: "11,14,17,20,2b", os: ubuntu-22.04, install: clang-14}
+          - {toolset: clang++-15,  cxxstd: "11,14,17,20,2b", os: ubuntu-22.04, install: clang-15}
+          - {toolset: clang++-16,  cxxstd: "11,14,17,20,2b", os: ubuntu-24.04, install: clang-16}
+          - {toolset: clang++-17,  cxxstd: "11,14,17,20,2b", os: ubuntu-24.04, install: clang-17}
+          - {toolset: clang++-18,  cxxstd: "11,14,17,20,2b", os: ubuntu-24.04, install: clang-18}
+          - {toolset: clang,       cxxstd: "11,14,17,20,2b", os: macos-13}
+          - {toolset: clang,       cxxstd: "11,14,17,20,2b", os: macos-14}
 
     runs-on: ${{matrix.os}}
     container:
@@ -225,11 +99,6 @@ jobs:
           ./bootstrap.sh
           ./b2 -d0 headers
 
-      - name: Create user-config.jam
-        if: matrix.compiler
-        run: |
-          echo "using ${{matrix.toolset}} : : ${{matrix.compiler}} ;" > ~/user-config.jam
-
       - name: Run tests
         run: |
           cd ../boost-root