diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 747fe517b..7343fb276 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -13,6 +13,7 @@ env:
   BUILD_TYPE: Release
   CC: clang
   CXX: clang++
+  FEX_PORTABLE: 1
 
 jobs:
   build_plus_test:
@@ -136,6 +137,9 @@ jobs:
     - name: FEXLinuxTests
       working-directory: ${{runner.workspace}}/build
       shell: bash
+      env:
+        # These tests require non-portable install due to thunks.
+        FEX_PORTABLE: 0
       run: cmake --build . --config $BUILD_TYPE --target fex_linux_tests_all
 
     - name: FEXLinuxTests Results move
diff --git a/.github/workflows/glibc_fault.yml b/.github/workflows/glibc_fault.yml
index 53a2adc28..afd7136fc 100644
--- a/.github/workflows/glibc_fault.yml
+++ b/.github/workflows/glibc_fault.yml
@@ -20,6 +20,7 @@ env:
   BUILD_TYPE: Release
   CC: clang
   CXX: clang++
+  FEX_PORTABLE: 1
 
 jobs:
   glibc_fault_test:
diff --git a/.github/workflows/hostrunner.yml b/.github/workflows/hostrunner.yml
index 1579e2f0d..6161c8f3c 100644
--- a/.github/workflows/hostrunner.yml
+++ b/.github/workflows/hostrunner.yml
@@ -13,6 +13,7 @@ env:
   BUILD_TYPE: Release
   CC: clang
   CXX: clang++
+  FEX_PORTABLE: 1
 
 jobs:
   hostrunner_tests:
diff --git a/.github/workflows/vixl_simulator.yml b/.github/workflows/vixl_simulator.yml
index 1b0d5d9cc..c8c10fefa 100644
--- a/.github/workflows/vixl_simulator.yml
+++ b/.github/workflows/vixl_simulator.yml
@@ -13,6 +13,7 @@ env:
   BUILD_TYPE: Release
   CC: clang
   CXX: clang++
+  FEX_PORTABLE: 1
 
 jobs:
   vixl_simulator: