diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,12 +2,14 @@
 
 include(CheckSymbolExists)
 
-option(TEST_SUITE_FORTRAN "Enable Fortran test suite" OFF)
 
 project(test-suite C CXX)
 
-if(TEST_SUITE_FORTRAN)
+if(${TEST_SUITE_SUBDIRS} MATCHES "Fortran")
+  option(TEST_SUITE_FORTRAN "Enable Fortran test suite" ON)
   enable_language(Fortran)
+else()
+  option(TEST_SUITE_FORTRAN "Enable Fortran test suite" OFF)
 endif()
 
 function(append value)
diff --git a/Fortran/UnitTests/fcvs21_f95/CMakeLists.txt b/Fortran/UnitTests/fcvs21_f95/CMakeLists.txt
--- a/Fortran/UnitTests/fcvs21_f95/CMakeLists.txt
+++ b/Fortran/UnitTests/fcvs21_f95/CMakeLists.txt
@@ -33,6 +33,8 @@
 # explicit acknowledgement of what has been changed. Please
 # amend README file if you modify the tests.
 
+include(CheckFortranCompilerFlag)
+
 # clean-up fort.* files otherwise one of the tests will fail
 llvm_test_prepare(rm -f %S/fort.*)