diff --git a/cmake/Modules/FindIFEMDeps.cmake b/cmake/Modules/FindIFEMDeps.cmake
index 41ea63b4f..a95ed44e9 100644
--- a/cmake/Modules/FindIFEMDeps.cmake
+++ b/cmake/Modules/FindIFEMDeps.cmake
@@ -276,6 +276,7 @@ endif()
 
 include(CheckCXXCompilerFlag)
 check_cxx_compiler_flag(-Wall HAS_WALL)
+check_cxx_compiler_flag(-Wextra HAS_WEXTRA)
 check_cxx_compiler_flag(-Wno-parentheses HAS_PARENTHESES)
 if(HAS_WALL)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
@@ -283,6 +284,9 @@ endif()
 if(HAS_PARENTHESES)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-parentheses")
 endif()
+if(HAS_WEXTRA)
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wextra -Wno-unused-parameter")
+endif()
 
 set(IFEM_REGTEST_SCRIPT ${IFEM_PATH}/Apps/Common/scripts/regtest.sh.in)
 set(IFEM_CLANG_CHECK_TEST_SCRIPT ${IFEM_PATH}/Apps/Common/scripts/clang-check-test.sh.in)
diff --git a/jenkins/build-ifem-module.sh b/jenkins/build-ifem-module.sh
index 1fde0b6aa..9df062a4b 100755
--- a/jenkins/build-ifem-module.sh
+++ b/jenkins/build-ifem-module.sh
@@ -97,7 +97,7 @@ function build_module {
   cmake $3 -DCMAKE_BUILD_TYPE=Release $1
   test $? -eq 0 || exit 1
   # Threaded build
-  nproc=`nproc`
+  nproc=1 #`nproc`
   if test $2 -eq 1
   then
     cmake --build . --target testapps -- -j$nproc