diff --git a/example/ex2/CMakeLists.txt b/example/ex2/CMakeLists.txt
index 339ba922..bfc49c4b 100644
--- a/example/ex2/CMakeLists.txt
+++ b/example/ex2/CMakeLists.txt
@@ -3,8 +3,7 @@
 set(SELF_EXE xo_unit_ex2)
 set(SELF_SRCS ex2.cpp)
 
-add_executable(${SELF_EXE} ${SELF_SRCS})
-xo_include_options2(${SELF_EXE})
+xo_add_executable(${SELF_EXE} ${SELF_SRCS})
 
 # ----------------------------------------------------------------
 # dependencies..
diff --git a/example/ex3/CMakeLists.txt b/example/ex3/CMakeLists.txt
index b3f1bc19..aebfe0fe 100644
--- a/example/ex3/CMakeLists.txt
+++ b/example/ex3/CMakeLists.txt
@@ -3,8 +3,7 @@
 set(SELF_EXE xo_unit_ex3)
 set(SELF_SRCS ex3.cpp)
 
-add_executable(${SELF_EXE} ${SELF_SRCS})
-xo_include_options2(${SELF_EXE})
+xo_add_executable(${SELF_EXE} ${SELF_SRCS})
 
 # ----------------------------------------------------------------
 # dependencies..
diff --git a/example/ex4/CMakeLists.txt b/example/ex4/CMakeLists.txt
index 583e150b..cfec5b2a 100644
--- a/example/ex4/CMakeLists.txt
+++ b/example/ex4/CMakeLists.txt
@@ -3,8 +3,7 @@
 set(SELF_EXE xo_unit_ex4)
 set(SELF_SRCS ex4.cpp)
 
-add_executable(${SELF_EXE} ${SELF_SRCS})
-xo_include_options2(${SELF_EXE})
+xo_add_executable(${SELF_EXE} ${SELF_SRCS})
 
 # ----------------------------------------------------------------
 # dependencies..
diff --git a/example/ex5/CMakeLists.txt b/example/ex5/CMakeLists.txt
index c7761d4c..d5956051 100644
--- a/example/ex5/CMakeLists.txt
+++ b/example/ex5/CMakeLists.txt
@@ -3,8 +3,7 @@
 set(SELF_EXE xo_unit_ex5)
 set(SELF_SRCS ex5.cpp)
 
-add_executable(${SELF_EXE} ${SELF_SRCS})
-xo_include_options2(${SELF_EXE})
+xo_add_executable(${SELF_EXE} ${SELF_SRCS})
 
 # ----------------------------------------------------------------
 # dependencies..
diff --git a/example/ex6/CMakeLists.txt b/example/ex6/CMakeLists.txt
index ce583825..ee836bc7 100644
--- a/example/ex6/CMakeLists.txt
+++ b/example/ex6/CMakeLists.txt
@@ -3,8 +3,7 @@
 set(SELF_EXE xo_unit_ex6)
 set(SELF_SRCS ex6.cpp)
 
-add_executable(${SELF_EXE} ${SELF_SRCS})
-xo_include_options2(${SELF_EXE})
+xo_add_executable(${SELF_EXE} ${SELF_SRCS})
 
 # ----------------------------------------------------------------
 # dependencies..