diff --git a/tests/build-gating.fmf b/tests/build-gating.fmf
index 4ae3f50..573a4e5 100644
--- a/tests/build-gating.fmf
+++ b/tests/build-gating.fmf
@@ -1,3 +1,15 @@
+#
+# Build/PR gating tests for *LLVM 13*
+#
+# Compatible with various LLVM 13 distributions:
+#
+#   * Fedora (ursine packages)
+#   * Centos 9 stream (ursine packages)
+#   * RHEL-9 (ursine packages)
+#   * RHEL-8 (Red Hat module)
+#   * RHEL-7 (software collection)
+#
+
 summary: Clang tests for build/PR gating
 adjust:
   - because: "Plan to be ran when either executed locally, or executed by CI system to gate a build or PR."
@@ -6,6 +18,12 @@ adjust:
       and trigger != commit
       and trigger != build
     enabled: false
+
+  - because: "When testing SCL-ized LLVM, the collection must be enabled first"
+    environment+:
+      WITH_SCL: "scl enable llvm-toolset-13.0 rust-toolset-1.58"
+    when: "collection == llvm-toolset-13.0"
+
 discover:
     - name: Local tests
       how: fmf
@@ -17,10 +35,6 @@ discover:
       test: integration-test-suite
 execute:
     how: tmt
-prepare:
-    - name: packages
-      how: install
-      package: clang
 provision:
   hardware:
     memory: ">= 4 GiB"
diff --git a/tests/clang-format-diff/main.fmf b/tests/clang-format-diff/main.fmf
index 8eadb00..16bcfcc 100644
--- a/tests/clang-format-diff/main.fmf
+++ b/tests/clang-format-diff/main.fmf
@@ -1,4 +1,12 @@
 summary: clang-format-diff
-test: ./test.sh
-require:
-  - clang-tools-extra
+test: "$WITH_SCL ./test.sh"
+adjust:
+  # Common requirements when LLVM is not SCL-ized
+  - require:
+      - clang-tools-extra
+    when: "collection is not defined"
+
+  # Requirements for SCL-ized LLVM
+  - require:
+      - llvm-toolset-13.0-clang-tools-extra
+    when: "collection == llvm-toolset-13.0"
diff --git a/tests/fedora-flags/main.fmf b/tests/fedora-flags/main.fmf
index 118336e..0c54189 100644
--- a/tests/fedora-flags/main.fmf
+++ b/tests/fedora-flags/main.fmf
@@ -1,5 +1,5 @@
 summary: fedora-flags
-test: ./test.sh
+test: "$WITH_SCL ./test.sh"
 require:
   - annobin
   - redhat-rpm-config
diff --git a/tests/libomp/main.fmf b/tests/libomp/main.fmf
index a2c9403..536527c 100644
--- a/tests/libomp/main.fmf
+++ b/tests/libomp/main.fmf
@@ -7,7 +7,20 @@ summary: libomp tests
 # it shouldn't be part of the `/tests/default` plan.
 tag:
   - not-in-default
-test: ./test.sh
-require:
-  - clang
-  - libomp
+test: "$WITH_SCL ./test.sh"
+adjust:
+  # Common requirements when LLVM is not SCL-ized
+  - require:
+      - clang
+      - clang-libs
+      - libomp
+      - libomp-devel
+    when: "collection is not defined"
+
+  # Requirements for SCL-ized LLVM
+  - require:
+      - llvm-toolset-13.0-clang
+      - llvm-toolset-13.0-clang-libs
+      - llvm-toolset-13.0-libomp
+      - llvm-toolset-13.0-libomp-devel
+    when: "collection == llvm-toolset-13.0"
diff --git a/tests/llvm-test-suite/main.fmf b/tests/llvm-test-suite/main.fmf
index 9515577..b805467 100644
--- a/tests/llvm-test-suite/main.fmf
+++ b/tests/llvm-test-suite/main.fmf
@@ -6,7 +6,8 @@ adjust:
     when: "distro == rhel"
     enabled: false
 
-test: ./test.sh
+test: "$WITH_SCL ./test.sh"
+
 require:
   - git
   - clang
diff --git a/tests/llvm-toolchain/main.fmf b/tests/llvm-toolchain/main.fmf
index 96d4d56..5923b64 100644
--- a/tests/llvm-toolchain/main.fmf
+++ b/tests/llvm-toolchain/main.fmf
@@ -1,30 +1,36 @@
 # TODO REVIEW: better summary
 summary: ""
-test: ./test.sh
+test: "$WITH_SCL ./test.sh"
+require:
+  - glibc-devel
+  - glibc-static
+  - gcc
 adjust:
-  - environment+:
-      CXXLIB: "libc++"
-    require:
+  # Common requirements when LLVM is not SCL-ized
+  - require+:
       - clang
       - lld
       - compiler-rt
+    when: "collection is not defined"
+
+  # Requirements for SCL-ized LLVM
+  - require+:
+      - llvm-toolset-13.0-clang
+      - llvm-toolset-13.0-lld
+      - llvm-toolset-13.0-compiler-rt
+    when: "collection == llvm-toolset-13.0"
+
+  - environment+:
+      CXXLIB: "libc++"
+    require+:
       - libcxx-devel
       - libcxx-static
-      - glibc-devel
-      - glibc-static
-      - gcc
     when: "distro == fedora"
     because: testing against libcxx package in Fedora
+
   - environment+:
       CXXLIB: "libstdc++"
     require:
-      - clang
-      - lld
-      - compiler-rt
-      - glibc-devel
-      - glibc-static
-      - gcc
       - libstdc++
     when: "distro == rhel"
     because: testing against libstdc++ package in RHEL as libcxx is not shipped with RHEL
-require: []
diff --git a/tests/pocl/main.fmf b/tests/pocl/main.fmf
index c1395dc..8ed6cf7 100644
--- a/tests/pocl/main.fmf
+++ b/tests/pocl/main.fmf
@@ -14,7 +14,7 @@ adjust:
 tag:
   - not-in-default
 # rhbz#1582884
-test: ./test.sh
+test: "$WITH_SCL ./test.sh"
 require:
   - git
   - ocl-icd-devel
diff --git a/tests/rhbz_1647130/main.fmf b/tests/rhbz_1647130/main.fmf
index 40c4aa1..fef12e3 100644
--- a/tests/rhbz_1647130/main.fmf
+++ b/tests/rhbz_1647130/main.fmf
@@ -1,4 +1,13 @@
 summary: RHBZ1647130
-test: ./test.sh
-require:
-  - clang
+test: "$WITH_SCL ./test.sh"
+require: []
+adjust:
+  # Common requirements when LLVM is not SCL-ized
+  - require+:
+      - clang
+    when: "collection is not defined"
+
+  # Requirements for SCL-ized LLVM
+  - require+:
+      - llvm-toolset-13.0-clang
+    when: "collection == llvm-toolset-13.0"
diff --git a/tests/rhbz_1657544/main.fmf b/tests/rhbz_1657544/main.fmf
index 223c5f5..3e7b320 100644
--- a/tests/rhbz_1657544/main.fmf
+++ b/tests/rhbz_1657544/main.fmf
@@ -1,4 +1,13 @@
 summary: RHBZ1657544
-test: ./test.sh
-require:
-  - clang
+test: "$WITH_SCL ./test.sh"
+require: []
+adjust:
+  # Common requirements when LLVM is not SCL-ized
+  - require+:
+      - clang
+    when: "collection is not defined"
+
+  # Requirements for SCL-ized LLVM
+  - require+:
+      - llvm-toolset-13.0-clang
+    when: "collection == llvm-toolset-13.0"
diff --git a/tests/rhbz_482491/main.fmf b/tests/rhbz_482491/main.fmf
index cac70ae..a2f8800 100644
--- a/tests/rhbz_482491/main.fmf
+++ b/tests/rhbz_482491/main.fmf
@@ -1,5 +1,14 @@
 summary: rhbz-482491
-test: ./test.sh
+test: "$WITH_SCL ./test.sh"
 require:
-  - clang
   - libgcc
+adjust:
+  # Common requirements when LLVM is not SCL-ized
+  - require+:
+      - clang
+    when: "collection is not defined"
+
+  # Requirements for SCL-ized LLVM
+  - require+:
+      - llvm-toolset-13.0-clang
+    when: "collection == llvm-toolset-13.0"
diff --git a/tests/toolchains/main.fmf b/tests/toolchains/main.fmf
index 7a3b0f4..b8cf748 100644
--- a/tests/toolchains/main.fmf
+++ b/tests/toolchains/main.fmf
@@ -1,21 +1,31 @@
 # TODO REVIEW: better summary
 summary: ""
-test: ./test.sh
+test: "$WITH_SCL ./test.sh"
 adjust:
+  # Common requirements when LLVM is not SCL-ized
+  - require+:
+      - clang
+    when: "collection is not defined"
+
+  # Requirements for SCL-ized LLVM
+  - require+:
+      - llvm-toolset-13.0-clang
+    when: "collection == llvm-toolset-13.0"
+
   - environment+:
       CXXLIBS: "libc++"
     require:
-      - clang
       - libcxx-devel
     when: "distro == fedora"
     because: testing against libcxx package in Fedora
+
   - environment+:
       CXXLIBS: "libstdc++"
     require:
-      - clang
       - libstdc++
     when: "distro == rhel"
     because: testing against libstdc++ package in RHEL as libcxx is not shipped with RHEL
+
 # TODO REVIEW: are these all requirements? test.sh seems to run quite a lot of stuff, looks like we
 # need more packages from LLVM family.
 require: []