diff --git a/pkgs/onnx.sh b/pkgs/onnx.sh
index d1bdc93d..40b39460 100644
--- a/pkgs/onnx.sh
+++ b/pkgs/onnx.sh
@@ -10,7 +10,28 @@
         benjaminp/six                               \
         'pytest-dev/pytest,[3.6=7.0.]'              \
         'numpy/numpy,v[3.6=v1.19.|3.7=v1.21.]'      \
-        'scipy/scipy,v[3.6=v1.5.|3.7=v1.7.]'        \
+
+    # Known issues:
+    # - SciPy meson build uses the wrong casing of OpenBLAS for CMake.
+    #   On Debian, pkg-config also searches in /usr/local and works as a fallback, but not on CentOS 7.
+    #   https://github.com/scipy/scipy/issues/16308
+    (
+        set -xe
+
+        case "$DISTRO_ID" in
+        'centos' | 'fedora' | 'rhel' | 'scientific')
+            export PKG_CONFIG_PATH="$(rpm -ql roaster-openblas | grep -v '/src/' | grep '\.pc' | xargs -rI{} dirname {} | sort -u | paste -sd: -)"
+            ;;
+        'debian' | 'linuxmint' | 'ubuntu')
+            export PKG_CONFIG_PATH="$(dpkg -L roaster-openblas | grep -v '/src/' | grep '\.pc' | xargs -rI{} dirname {} | sort -u | paste -sd: -)"
+            ;;
+        esac
+
+        "$ROOT_DIR/pkgs/utils/pip_install_from_git.sh"  \
+            'scipy/scipy,v[3.6=v1.5.|3.7=v1.7.]'        \
+    )
+
+    "$ROOT_DIR/pkgs/utils/pip_install_from_git.sh"  \
         'scikit-learn/scikit-learn,[3.6=0.24.|3.7=1.0.]'
 
     # ------------------------------------------------------------
diff --git a/pkgs/pytorch.sh b/pkgs/pytorch.sh
index a49cce16..a0894b6a 100644
--- a/pkgs/pytorch.sh
+++ b/pkgs/pytorch.sh
@@ -13,7 +13,28 @@
         'pytest-dev/pytest,[3.6=7.0.]'                      \
         Frozenball/pytest-sugar,master                      \
         'numpy/numpy,v[3.6=v1.19.|3.7=v1.21.]'              \
-        'scipy/scipy,v[3.6=v1.5.|3.7=v1.7.]'                \
+
+    # Known issues:
+    # - SciPy meson build uses the wrong casing of OpenBLAS for CMake.
+    #   On Debian, pkg-config also searches in /usr/local and works as a fallback, but not on CentOS 7.
+    #   https://github.com/scipy/scipy/issues/16308
+    (
+        set -xe
+
+        case "$DISTRO_ID" in
+        'centos' | 'fedora' | 'rhel' | 'scientific')
+            export PKG_CONFIG_PATH="$(rpm -ql roaster-openblas | grep -v '/src/' | grep '\.pc' | xargs -rI{} dirname {} | sort -u | paste -sd: -)"
+            ;;
+        'debian' | 'linuxmint' | 'ubuntu')
+            export PKG_CONFIG_PATH="$(dpkg -L roaster-openblas | grep -v '/src/' | grep '\.pc' | xargs -rI{} dirname {} | sort -u | paste -sd: -)"
+            ;;
+        esac
+
+        "$ROOT_DIR/pkgs/utils/pip_install_from_git.sh"          \
+            'scipy/scipy,v[3.6=v1.5.|3.7=v1.7.]'                \
+    )
+
+    "$ROOT_DIR/pkgs/utils/pip_install_from_git.sh"          \
         'networkx/networkx,networkx-[3.6=networkx-2.5.]'    \
         micheles/decorator
     case "$(python3 --version | cut -d' ' -f2 | cut -d. -f-2)" in
diff --git a/pkgs/utils/pip_install_from_git.sh b/pkgs/utils/pip_install_from_git.sh
index 6b44f40b..e47f9ca4 100755
--- a/pkgs/utils/pip_install_from_git.sh
+++ b/pkgs/utils/pip_install_from_git.sh
@@ -129,7 +129,7 @@ for i in 'pypa/setuptools,v60.[3.6=v59.6.]' 'pypa/pip,[3.6=21.]' pypa/wheel Pyth
             set +x
             for opt in '' '-I' ';'; do
                 [ "_$opt" != '_;' ]
-                ! /usr/bin/sudo -E PATH="$PATH" PIP_INDEX_URL="$PIP_INDEX_URL" "$py" -m pip install --no-clean -Uv $opt "$URL" || break
+                ! /usr/bin/sudo -E PATH="$PATH" PIP_INDEX_URL="$PIP_INDEX_URL" PKG_CONFIG_PATH="$PKG_CONFIG_PATH" "$py" -m pip install --no-clean -Uv $opt "$URL" || break
             done
         )