diff --git a/nix/rt.nix b/nix/rt.nix
index f7c1ab5..3d38243 100644
--- a/nix/rt.nix
+++ b/nix/rt.nix
@@ -85,7 +85,6 @@ let
         last.nanos6
         pkgs.strace
       ];
-      cmakeFlags = old.cmakeFlags ++ [ "-DENABLE_TEST_RT=ON" ];
     });
   });
 
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 0a25e9d..d8e181e 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -20,7 +20,4 @@ set(OVNI_TEST_BUILD_DIR "${CMAKE_BINARY_DIR}/test")
 include(macros.cmake)
 
 add_subdirectory(emu)
-
-if(ENABLE_TEST_RT)
-  add_subdirectory(rt)
-endif()
+add_subdirectory(rt)
diff --git a/test/rt/CMakeLists.txt b/test/rt/CMakeLists.txt
index 538f8b6..256cad7 100644
--- a/test/rt/CMakeLists.txt
+++ b/test/rt/CMakeLists.txt
@@ -14,19 +14,5 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
-find_library(nosv libnosv)
-find_path(NOSV_INCLUDE_DIR nosv.h)
-
-function(nosv_test)
-  ovni_test(${ARGN})
-  target_link_libraries("${OVNI_TEST_NAME}" nosv)
-  target_include_directories("${OVNI_TEST_NAME}"
-    PUBLIC ${NOSV_INCLUDE_DIR})
-  set_property(TEST "${OVNI_TEST_NAME}" APPEND
-    PROPERTY
-      ENVIRONMENT "NOSV_CONFIG=${OVNI_TEST_SOURCE_DIR}/rt/nosv/nosv.toml")
-endfunction()
-
-nosv_test(nosv/attach.c)
-
+add_subdirectory(nosv)
 add_subdirectory(nanos6)
diff --git a/test/rt/nanos6/CMakeLists.txt b/test/rt/nanos6/CMakeLists.txt
index 64dde88..fc5cf71 100644
--- a/test/rt/nanos6/CMakeLists.txt
+++ b/test/rt/nanos6/CMakeLists.txt
@@ -1,6 +1,21 @@
 find_library(nanos6 libnanos6)
 find_path(NANOS6_INCLUDE_DIR nanos6.h)
 
+include(CheckCCompilerFlag)
+check_c_compiler_flag("-fompss-2" HAVE_FOMPSS2_FLAG)
+if(NOT HAVE_FOMPSS2_FLAG)
+  message(STATUS "Compiler doesn't support -fompss-2 flag, disabling Nanos6 RT tests")
+  return()
+endif()
+
+check_library_exists(nanos6 nanos6_init "nanos6.h" HAVE_NANOS6)
+if(NOT HAVE_NANOS6)
+  message(STATUS "Nanos6 not found, disabling Nanos6 RT tests")
+  return()
+else()
+  message(STATUS "Enabling Nanos6 RT tests")
+endif()
+
 function(nanos6_rt_test)
   set(switches "")
   set(single LEVEL)
@@ -27,6 +42,8 @@ nanos6_rt_test(several-tasks.c)
 nanos6_rt_test(sched-add.c)
 nanos6_rt_test(if0.c)
 nanos6_rt_test(taskfor.c)
+
+# Test multiple instrumentation levels
 nanos6_rt_test(simple-task.c NAME simple-task-level-1 LEVEL 1)
 nanos6_rt_test(simple-task.c NAME simple-task-level-2 LEVEL 2)
 nanos6_rt_test(simple-task.c NAME simple-task-level-3 LEVEL 3)
diff --git a/test/rt/nosv/CMakeLists.txt b/test/rt/nosv/CMakeLists.txt
new file mode 100644
index 0000000..1972998
--- /dev/null
+++ b/test/rt/nosv/CMakeLists.txt
@@ -0,0 +1,39 @@
+#
+# Copyright (c) 2022 Barcelona Supercomputing Center (BSC)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+find_library(nosv libnosv)
+find_path(NOSV_INCLUDE_DIR nosv.h)
+
+check_library_exists(nosv nosv_init "nosv.h" HAVE_NOSV)
+
+if(NOT HAVE_NOSV)
+  message(STATUS "nOS-V library not found, disabling nOS-V RT tests")
+  return()
+else()
+  message(STATUS "Enabling nOS-V RT tests")
+endif()
+
+function(nosv_test)
+  ovni_test(${ARGN})
+  target_link_libraries("${OVNI_TEST_NAME}" nosv)
+  target_include_directories("${OVNI_TEST_NAME}"
+    PUBLIC ${NOSV_INCLUDE_DIR})
+  set_property(TEST "${OVNI_TEST_NAME}" APPEND
+    PROPERTY
+      ENVIRONMENT "NOSV_CONFIG=${OVNI_TEST_SOURCE_DIR}/rt/nosv/nosv.toml")
+endfunction()
+
+nosv_test(attach.c)