From df55908f3d33b3a3ffd1bfa709068387470ad831 Mon Sep 17 00:00:00 2001
From: Tadeja Kadunc <tadeja.kadunc@gmail.com>
Date: Tue, 18 Aug 2026 12:38:48 +0200
Subject: [PATCH 1/2] Install conda_gcc_specs on Linux

---
 dev/release/verify-release-candidate.sh | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dev/release/verify-release-candidate.sh b/dev/release/verify-release-candidate.sh
index 05303b7bcfb2..208a39dba3f7 100755
--- a/dev/release/verify-release-candidate.sh
+++ b/dev/release/verify-release-candidate.sh
@@ -443,6 +443,12 @@ maybe_setup_virtualenv() {
 test_and_install_cpp() {
   show_header "Build, install and test C++ libraries"
 
+  # Ensure GCC uses libraries and headers from the Conda env
+  local conda_gcc_specs=()
+  if [ "$(uname)" = "Linux" ]; then
+    conda_gcc_specs=(conda-gcc-specs)
+  fi
+
   # Build and test C++
   maybe_setup_virtualenv numpy
   maybe_setup_conda \
@@ -452,7 +458,8 @@ test_and_install_cpp() {
     ncurses \
     numpy \
     sqlite \
-    compilers
+    compilers \
+    "${conda_gcc_specs[@]}"
 
   if [ "${USE_CONDA}" -gt 0 ]; then
     DEFAULT_DEPENDENCY_SOURCE="CONDA"

From a8c2636a081bdf30ba96b5fd05a636f7c07f0853 Mon Sep 17 00:00:00 2001
From: Tadeja Kadunc <tadeja.kadunc@gmail.com>
Date: Wed, 19 Aug 2026 12:26:17 +0200
Subject: [PATCH 2/2] Install conda-gcc-specs in Conda images

---
 ci/docker/conda-cpp.dockerfile         | 1 +
 ci/docker/conda-integration.dockerfile | 1 +
 2 files changed, 2 insertions(+)

diff --git a/ci/docker/conda-cpp.dockerfile b/ci/docker/conda-cpp.dockerfile
index 4340a18f6eea..ceba8545e8bf 100644
--- a/ci/docker/conda-cpp.dockerfile
+++ b/ci/docker/conda-cpp.dockerfile
@@ -34,6 +34,7 @@ RUN mamba install -q -y \
         --file arrow/ci/conda_env_cpp.txt \
         --file arrow/ci/conda_env_gandiva.txt \
         compilers \
+        conda-gcc-specs \
         doxygen \
         libnuma \
         mold \
diff --git a/ci/docker/conda-integration.dockerfile b/ci/docker/conda-integration.dockerfile
index 272141b604e0..612bdac32374 100644
--- a/ci/docker/conda-integration.dockerfile
+++ b/ci/docker/conda-integration.dockerfile
@@ -37,6 +37,7 @@ RUN mamba install -q -y \
         "python < 3.12" \
         numpy \
         compilers \
+        conda-gcc-specs \
         go \
         maven=${maven} \
         nodejs=${node} \