diff --git a/easybuild/easyconfigs/l/LLVM/LLVM-18.1.8-GCCcore-13.3.0.eb b/easybuild/easyconfigs/l/LLVM/LLVM-18.1.8-GCCcore-13.3.0.eb
index e8eee49e9ecf..55ec923d349f 100644
--- a/easybuild/easyconfigs/l/LLVM/LLVM-18.1.8-GCCcore-13.3.0.eb
+++ b/easybuild/easyconfigs/l/LLVM/LLVM-18.1.8-GCCcore-13.3.0.eb
@@ -43,6 +43,7 @@ builddependencies = [
 ]
 
 dependencies = [
+    ('libffi', '3.4.5'),
     ('libxml2', '2.12.7'),
     ('ncurses', '6.5'),
     ('zlib', '1.3.1'),
@@ -76,8 +77,4 @@ test_suite_max_failed = 150  # Could increase depending on build targets
 test_suite_timeout_single = 5 * 60
 # test_suite_timeout_total = 10*3600
 
-# LLVM will produce .mod files for its flang installation at the 3rd stage of the build via Clang+Flang
-# These should not be checked for sanity, as we want to build LLVM on top of GCCcore to be used as a new toolchain
-skip_mod_files_sanity_check = True
-
 moduleclass = 'compiler'
diff --git a/easybuild/easyconfigs/l/LLVM/LLVM-19.1.7-GCCcore-13.3.0.eb b/easybuild/easyconfigs/l/LLVM/LLVM-19.1.7-GCCcore-13.3.0.eb
index 635bc3e88333..6e37f4bb7907 100644
--- a/easybuild/easyconfigs/l/LLVM/LLVM-19.1.7-GCCcore-13.3.0.eb
+++ b/easybuild/easyconfigs/l/LLVM/LLVM-19.1.7-GCCcore-13.3.0.eb
@@ -46,6 +46,7 @@ builddependencies = [
 ]
 
 dependencies = [
+    ('libffi', '3.4.5'),
     ('libxml2', '2.12.7'),
     ('ncurses', '6.5'),
     ('zlib', '1.3.1'),
@@ -85,8 +86,4 @@ test_suite_ignore_patterns = [
     "api_tests/test_ompd_get_icv_from_scope.c",
 ]
 
-# LLVM will produce .mod files for its flang installation at the 3rd stage of the build via Clang+Flang
-# These should not be checked for sanity, as we want to build LLVM on top of GCCcore to be used as a new toolchain
-skip_mod_files_sanity_check = True
-
 moduleclass = 'compiler'
diff --git a/easybuild/easyconfigs/l/LLVM/LLVM-20.1.4-GCCcore-13.3.0.eb b/easybuild/easyconfigs/l/LLVM/LLVM-20.1.4-GCCcore-13.3.0.eb
index ccb8fd9fc9f4..6e5eb89912f4 100644
--- a/easybuild/easyconfigs/l/LLVM/LLVM-20.1.4-GCCcore-13.3.0.eb
+++ b/easybuild/easyconfigs/l/LLVM/LLVM-20.1.4-GCCcore-13.3.0.eb
@@ -46,6 +46,7 @@ builddependencies = [
 ]
 
 dependencies = [
+    ('libffi', '3.4.5'),
     ('libxml2', '2.12.7'),
     ('ncurses', '6.5'),
     ('zlib', '1.3.1'),
@@ -83,8 +84,4 @@ test_suite_ignore_patterns = [
     "api_tests/test_ompd_get_icv_from_scope.c",
 ]
 
-# LLVM will produce .mod files for its flang installation at the 3rd stage of the build via Clang+Flang
-# These should not be checked for sanity, as we want to build LLVM on top of GCCcore to be used as a new toolchain
-skip_mod_files_sanity_check = True
-
 moduleclass = 'compiler'
diff --git a/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.2.0.eb b/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.2.0.eb
index 17ad53a0c64d..9a4f720e2fd9 100644
--- a/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.2.0.eb
+++ b/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.2.0.eb
@@ -43,6 +43,7 @@ builddependencies = [
 ]
 
 dependencies = [
+    ('libffi', '3.4.4'),
     ('libxml2', '2.11.5'),
     ('ncurses', '6.4'),
     ('zlib', '1.2.13'),
@@ -80,8 +81,4 @@ test_suite_ignore_patterns = [
     "api_tests/test_ompd_get_icv_from_scope.c",
 ]
 
-# LLVM will produce .mod files for its flang installation at the 3rd stage of the build via Clang+Flang
-# These should not be checked for sanity, as we want to build LLVM on top of GCCcore to be used as a new toolchain
-skip_mod_files_sanity_check = True
-
 moduleclass = 'compiler'
diff --git a/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.3.0.eb b/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.3.0.eb
index 9ffd58c0050d..542f8b1cca40 100644
--- a/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.3.0.eb
+++ b/easybuild/easyconfigs/l/LLVM/LLVM-20.1.5-GCCcore-13.3.0.eb
@@ -46,6 +46,7 @@ builddependencies = [
 ]
 
 dependencies = [
+    ('libffi', '3.4.5'),
     ('libxml2', '2.12.7'),
     ('ncurses', '6.5'),
     ('zlib', '1.3.1'),
@@ -83,8 +84,4 @@ test_suite_ignore_patterns = [
     "api_tests/test_ompd_get_icv_from_scope.c",
 ]
 
-# LLVM will produce .mod files for its flang installation at the 3rd stage of the build via Clang+Flang
-# These should not be checked for sanity, as we want to build LLVM on top of GCCcore to be used as a new toolchain
-skip_mod_files_sanity_check = True
-
 moduleclass = 'compiler'