diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index b9ef7c0..5801f2f 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -11,9 +11,12 @@ jobs:
     steps:
     - name: Install clang-format
       run: |
-        wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
-        CODENAME=$(lsb_release --short --codename)
-        sudo add-apt-repository "deb https://apt.llvm.org/${CODENAME}/ llvm-toolchain-${CODENAME}-${CLANG_VERSION} main"
+        major_version=$(lsb_release -rs | cut -d'.' -f1)
+        if [ "$major_version" -lt "24" ]; then
+          wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+          CODENAME=$(lsb_release --short --codename)
+          sudo add-apt-repository "deb https://apt.llvm.org/${CODENAME}/ llvm-toolchain-${CODENAME}-${CLANG_VERSION} main"
+        fi
         sudo apt update
         sudo apt install -y clang-format-${CLANG_VERSION}
 
diff --git a/.github/workflows/ubuntu.yaml b/.github/workflows/ubuntu.yaml
index 0f2a18c..a77f81a 100644
--- a/.github/workflows/ubuntu.yaml
+++ b/.github/workflows/ubuntu.yaml
@@ -11,12 +11,31 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - name: Build - Ubuntu 20 Clang
+            runs-on: ubuntu-20.04
+            compiler: clang
+            cxx-compiler: clang++
+            cmake-args: -G Ninja -D PROXYRES_CODE_COVERAGE=ON
+            packages: llvm-12 libjavascriptcoregtk-4.0-dev libgconf2-dev
+            gcov-exec: llvm-cov-12 gcov
+            codecov: ubuntu
+
+          - name: Build - Ubuntu 22 Clang
+            runs-on: ubuntu-22.04
+            compiler: clang
+            cxx-compiler: clang++
+            cmake-args: -G Ninja -D PROXYRES_CODE_COVERAGE=ON
+            packages: llvm-14 libjavascriptcoregtk-4.0-dev libgconf2-dev
+            gcov-exec: llvm-cov-14 gcov
+            codecov: ubuntu
+
           - name: Build - Ubuntu Clang
             runs-on: ubuntu-latest
             compiler: clang
             cxx-compiler: clang++
             cmake-args: -G Ninja -D PROXYRES_CODE_COVERAGE=ON
-            gcov-exec: llvm-cov-14 gcov
+            packages: llvm-15 libjavascriptcoregtk-4.1-dev gsettings-desktop-schemas
+            gcov-exec: llvm-cov-15 gcov
             codecov: ubuntu
 
           - name: Build - Ubuntu Clang (curl)
@@ -24,14 +43,15 @@ jobs:
             compiler: clang
             cxx-compiler: clang++
             cmake-args: -G Ninja -D PROXYRES_CODE_COVERAGE=ON -D PROXYRES_CURL=ON
-            gcov-exec: llvm-cov-14 gcov
+            packages: llvm-15 libjavascriptcoregtk-4.1-dev gsettings-desktop-schemas
+            gcov-exec: llvm-cov-15 gcov
             codecov: ubuntu_curl
 
     steps:
     - name: Install dependencies
       run: |
         sudo apt update
-        sudo apt install -y llvm-14 ninja-build libgconf2-dev libjavascriptcoregtk-4.0-dev
+        sudo apt install -y ninja-build libpsl-dev ${{ matrix.packages }}
 
     - name: Checkout repository
       uses: actions/checkout@v4
diff --git a/CMakeLists.txt b/CMakeLists.txt
index c6b80e2..1184f5d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -115,11 +115,14 @@ elseif(APPLE)
             wpad_dhcp_mac.h)
     endif()
 elseif(UNIX)
+    find_package(PkgConfig REQUIRED)
+    pkg_check_modules(GConf gconf-2.0)
+    if (GConf_FOUND)
+        list(APPEND PROXYRES_SRCS config_gnome2.c config_gnome2.h)
+    endif()
     list(APPEND PROXYRES_SRCS
         config_env.c
         config_env.h
-        config_gnome2.c
-        config_gnome2.h
         config_gnome3.c
         config_gnome3.h
         config_kde.c
@@ -282,16 +285,16 @@ elseif(APPLE)
 
     set_target_properties(proxyres PROPERTIES LINK_FLAGS -Wl,-F/Library/Frameworks)
 elseif(UNIX)
-    find_package(PkgConfig REQUIRED)
-
     pkg_check_modules(deps REQUIRED IMPORTED_TARGET glib-2.0)
     target_link_libraries(proxyres PkgConfig::deps)
 
-    pkg_check_modules(GConf REQUIRED gconf-2.0)
-    # Don't link libraries at compile time since we dynamically load them at runtime
-    target_include_directories(proxyres PRIVATE ${GConf_INCLUDE_DIRS})
+    if (GConf_FOUND)
+        # Don't link libraries at compile time since we dynamically load them at runtime
+        target_include_directories(proxyres PRIVATE ${GConf_INCLUDE_DIRS})
+        target_compile_definitions(proxyres PRIVATE HAVE_GCONF)
+    endif()
 
-    pkg_search_module(JSCoreGTK REQUIRED javascriptcoregtk-4.0 javascriptcoregtk-3.0 javascriptcoregtk-1.0)
+    pkg_search_module(JSCoreGTK REQUIRED javascriptcoregtk-4.1 javascriptcoregtk-4.0 javascriptcoregtk-3.0 javascriptcoregtk-1.0)
     # Don't link libraries at compile time since we dynamically load them at runtime
     target_include_directories(proxyres PRIVATE ${JSCoreGTK_INCLUDE_DIRS})
 
diff --git a/config.c b/config.c
index ef9d1e0..bc759c4 100644
--- a/config.c
+++ b/config.c
@@ -11,7 +11,9 @@
 #if defined(__APPLE__)
 #  include "config_mac.h"
 #elif defined(__linux__)
-#  include "config_gnome2.h"
+#  ifdef HAVE_GCONF
+#    include "config_gnome2.h"
+#  endif
 #  include "config_gnome3.h"
 #  include "config_kde.h"
 #elif defined(_WIN32)
@@ -102,10 +104,12 @@ bool proxy_config_global_init(void) {
         if (proxy_config_gnome3_global_init())
             g_proxy_config.proxy_config_i = proxy_config_gnome3_get_interface();
         break;
+#  ifdef HAVE_GCONF
     case DESKTOP_ENV_GNOME2:
         if (proxy_config_gnome2_global_init())
             g_proxy_config.proxy_config_i = proxy_config_gnome2_get_interface();
         break;
+#  endif
     case DESKTOP_ENV_KDE5:
     case DESKTOP_ENV_KDE4:
     case DESKTOP_ENV_KDE3:
diff --git a/config_gnome3.c b/config_gnome3.c
index 82c2272..96057fa 100644
--- a/config_gnome3.c
+++ b/config_gnome3.c
@@ -6,7 +6,6 @@
 #include <dlfcn.h>
 #include <glib.h>
 #include <gio/gio.h>
-#include <gconf/gconf.h>
 
 #include "config.h"
 #include "config_i.h"
diff --git a/test/curl_proxyres.c b/test/curl_proxyres.c
index 7a85bf2..0db8b73 100644
--- a/test/curl_proxyres.c
+++ b/test/curl_proxyres.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <stdbool.h>
+#include <stdlib.h>
 #include <string.h>
 
 #ifdef _WIN32