diff --git a/example/area/tri/main.c b/example/area/tri/main.c
index fb49e6abc..858a162d5 100644
--- a/example/area/tri/main.c
+++ b/example/area/tri/main.c
@@ -2,7 +2,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 
diff --git a/example/area/voronoi/main.c b/example/area/voronoi/main.c
index f39fca97a..b7e912e92 100644
--- a/example/area/voronoi/main.c
+++ b/example/area/voronoi/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/curv/mean/main.c b/example/curv/mean/main.c
index d6c6721f7..3eba70fd6 100644
--- a/example/curv/mean/main.c
+++ b/example/curv/mean/main.c
@@ -4,7 +4,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/gompper_kroll/main.c b/example/eng/gompper_kroll/main.c
index 317e7c027..e3a517e6f 100644
--- a/example/eng/gompper_kroll/main.c
+++ b/example/eng/gompper_kroll/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/gompper_kroll_ade/main.c b/example/eng/gompper_kroll_ade/main.c
index a694d44d4..2c5237bb8 100644
--- a/example/eng/gompper_kroll_ade/main.c
+++ b/example/eng/gompper_kroll_ade/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/juelicher/main.c b/example/eng/juelicher/main.c
index 86645f9ec..7fdc2da6b 100644
--- a/example/eng/juelicher/main.c
+++ b/example/eng/juelicher/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/juelicher_ade/main.c b/example/eng/juelicher_ade/main.c
index 20366e33d..5d0cfbb8f 100644
--- a/example/eng/juelicher_ade/main.c
+++ b/example/eng/juelicher_ade/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/kantor/main.c b/example/eng/kantor/main.c
index d6f02e2df..55d836ac5 100644
--- a/example/eng/kantor/main.c
+++ b/example/eng/kantor/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/kantor_nelson/main.c b/example/eng/kantor_nelson/main.c
index cd4f49201..8aad813db 100644
--- a/example/eng/kantor_nelson/main.c
+++ b/example/eng/kantor_nelson/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/kantor_nelson_1st_order/main.c b/example/eng/kantor_nelson_1st_order/main.c
index ede26656a..6ff418700 100644
--- a/example/eng/kantor_nelson_1st_order/main.c
+++ b/example/eng/kantor_nelson_1st_order/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/meyer_et_al/main.c b/example/eng/meyer_et_al/main.c
index c54ee8f2d..77b50c6bd 100644
--- a/example/eng/meyer_et_al/main.c
+++ b/example/eng/meyer_et_al/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/eng/meyer_et_al_ade/main.c b/example/eng/meyer_et_al_ade/main.c
index e2a24aa00..53e6b89be 100644
--- a/example/eng/meyer_et_al_ade/main.c
+++ b/example/eng/meyer_et_al_ade/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/area/main.c b/example/force/area/main.c
index faa000122..97c5b8baa 100644
--- a/example/force/area/main.c
+++ b/example/force/area/main.c
@@ -5,7 +5,7 @@
 #include <co/f/area.h>
 #include <co/memory.h>
 #include <co/punto.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static real *FX, *FY, *FZ;
 
diff --git a/example/force/garea/main.c b/example/force/garea/main.c
index 3506fa1cf..c1f98d735 100644
--- a/example/force/garea/main.c
+++ b/example/force/garea/main.c
@@ -5,7 +5,7 @@
 #include <co/f/garea.h>
 #include <co/memory.h>
 #include <co/punto.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static real *FX, *FY, *FZ;
 
diff --git a/example/force/gompper/main.c b/example/force/gompper/main.c
index 0e4c4c0cb..8bc1126ae 100644
--- a/example/force/gompper/main.c
+++ b/example/force/gompper/main.c
@@ -4,7 +4,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/ten.h>
 #include <co/tri.h>
diff --git a/example/force/gompper0/main.c b/example/force/gompper0/main.c
index c9b6ac531..fac8f592c 100644
--- a/example/force/gompper0/main.c
+++ b/example/force/gompper0/main.c
@@ -11,7 +11,7 @@
 #include <co/err.h>
 #include <co/macro.h>
 #include <co/util.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #define FMT_IN   CO_REAL_IN
 
diff --git a/example/force/gompper_kroll/main.c b/example/force/gompper_kroll/main.c
index 0e4c4c0cb..8bc1126ae 100644
--- a/example/force/gompper_kroll/main.c
+++ b/example/force/gompper_kroll/main.c
@@ -4,7 +4,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/ten.h>
 #include <co/tri.h>
diff --git a/example/force/gompper_kroll0/main.c b/example/force/gompper_kroll0/main.c
index f583cf6e9..915c06e42 100644
--- a/example/force/gompper_kroll0/main.c
+++ b/example/force/gompper_kroll0/main.c
@@ -11,7 +11,7 @@
 #include <co/err.h>
 #include <co/macro.h>
 #include <co/util.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #define FMT_IN   CO_REAL_IN
 
diff --git a/example/force/gompper_kroll_ade/main.c b/example/force/gompper_kroll_ade/main.c
index 0e4c4c0cb..8bc1126ae 100644
--- a/example/force/gompper_kroll_ade/main.c
+++ b/example/force/gompper_kroll_ade/main.c
@@ -4,7 +4,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/ten.h>
 #include <co/tri.h>
diff --git a/example/force/harmonic/main.c b/example/force/harmonic/main.c
index fba153629..8f40af9db 100644
--- a/example/force/harmonic/main.c
+++ b/example/force/harmonic/main.c
@@ -5,7 +5,7 @@
 #include <real.h>
 #include <co/memory.h>
 #include <co/punto.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static real *FX, *FY, *FZ;
 
diff --git a/example/force/harmonic_ref/test/main.c b/example/force/harmonic_ref/test/main.c
index 37d997d38..fd84c8f76 100644
--- a/example/force/harmonic_ref/test/main.c
+++ b/example/force/harmonic_ref/test/main.c
@@ -5,7 +5,7 @@
 #include <real.h>
 #include <co/memory.h>
 #include <co/punto.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static real *FX, *FY, *FZ;
 
diff --git a/example/force/juelicher/main.c b/example/force/juelicher/main.c
index f34065529..5415816b7 100644
--- a/example/force/juelicher/main.c
+++ b/example/force/juelicher/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/juelicher0/main.c b/example/force/juelicher0/main.c
index 0925d9e08..5b6b0a6e9 100644
--- a/example/force/juelicher0/main.c
+++ b/example/force/juelicher0/main.c
@@ -12,7 +12,7 @@
 #include <co/err.h>
 #include <co/macro.h>
 #include <co/util.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #define FMT_IN   CO_REAL_IN
 
diff --git a/example/force/juelicher_ade/main.c b/example/force/juelicher_ade/main.c
index da9434bbd..bd7195e30 100644
--- a/example/force/juelicher_ade/main.c
+++ b/example/force/juelicher_ade/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/juelicher_cuda/main.c b/example/force/juelicher_cuda/main.c
index 7b26ddf40..f4eaaaad3 100644
--- a/example/force/juelicher_cuda/main.c
+++ b/example/force/juelicher_cuda/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/kantor/main.c b/example/force/kantor/main.c
index 6e4ebc970..5854ed465 100644
--- a/example/force/kantor/main.c
+++ b/example/force/kantor/main.c
@@ -5,7 +5,7 @@
 #include <co/f/kantor.h>
 #include <co/memory.h>
 #include <co/punto.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static real *FX, *FY, *FZ;
 
diff --git a/example/force/kantor_nelson/main.c b/example/force/kantor_nelson/main.c
index b14783863..425eab2e0 100644
--- a/example/force/kantor_nelson/main.c
+++ b/example/force/kantor_nelson/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/kantor_nelson_1st_order/kantor_nelson_1st_order_factorized/main.c b/example/force/kantor_nelson_1st_order/kantor_nelson_1st_order_factorized/main.c
index c9a151196..c6e56e2df 100644
--- a/example/force/kantor_nelson_1st_order/kantor_nelson_1st_order_factorized/main.c
+++ b/example/force/kantor_nelson_1st_order/kantor_nelson_1st_order_factorized/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/kantor_nelson_1st_order/main.c b/example/force/kantor_nelson_1st_order/main.c
index 99a92d11b..3a8facd42 100644
--- a/example/force/kantor_nelson_1st_order/main.c
+++ b/example/force/kantor_nelson_1st_order/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/meyer0/main.c b/example/force/meyer0/main.c
index 3b276b283..213520118 100644
--- a/example/force/meyer0/main.c
+++ b/example/force/meyer0/main.c
@@ -12,7 +12,7 @@
 #include <co/err.h>
 #include <co/macro.h>
 #include <co/util.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #define FMT_IN   CO_REAL_IN
 
diff --git a/example/force/meyer_et_al/main.c b/example/force/meyer_et_al/main.c
index 63df2f1eb..c0d858f1a 100644
--- a/example/force/meyer_et_al/main.c
+++ b/example/force/meyer_et_al/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/meyer_et_al_ade/main.c b/example/force/meyer_et_al_ade/main.c
index 2896caaa3..9b8d896c9 100644
--- a/example/force/meyer_et_al_ade/main.c
+++ b/example/force/meyer_et_al_ade/main.c
@@ -3,7 +3,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/force/volume/main.c b/example/force/volume/main.c
index 4a7913755..da77a0163 100644
--- a/example/force/volume/main.c
+++ b/example/force/volume/main.c
@@ -4,7 +4,7 @@
 #include <real.h>
 #include <co/memory.h>
 #include <co/punto.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static real *FX, *FY, *FZ;
 
diff --git a/example/laplace/local/main.c b/example/laplace/local/main.c
index d79fdc11c..409cf06ef 100644
--- a/example/laplace/local/main.c
+++ b/example/laplace/local/main.c
@@ -4,7 +4,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/min/bit/main.c b/example/min/bit/main.c
index 38a5bf185..6fd8cdc11 100644
--- a/example/min/bit/main.c
+++ b/example/min/bit/main.c
@@ -20,7 +20,7 @@
 #include <co/util.h>
 #include <co/vec.h>
 #include <co/vtk.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static const real pi = 3.141592653589793115997964;
 
diff --git a/example/min/c0/main.c b/example/min/c0/main.c
index 19ca17e8d..15da052b2 100644
--- a/example/min/c0/main.c
+++ b/example/min/c0/main.c
@@ -17,7 +17,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/dynamic/main.c b/example/min/dynamic/main.c
index 3878e6e2d..9545d84ef 100644
--- a/example/min/dynamic/main.c
+++ b/example/min/dynamic/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #define FMT_IN   CO_REAL_IN
 
diff --git a/example/min/gompper/main.c b/example/min/gompper/main.c
index f49c68100..418d94a6f 100644
--- a/example/min/gompper/main.c
+++ b/example/min/gompper/main.c
@@ -7,7 +7,7 @@
 #include <co/err.h>
 #include <co/macro.h>
 #include <co/util.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #include <alg/x.h>
 #include <alg/min.h>
diff --git a/example/min/helfrich_xin/main.c b/example/min/helfrich_xin/main.c
index bab0f1172..a0f7958d0 100644
--- a/example/min/helfrich_xin/main.c
+++ b/example/min/helfrich_xin/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/main.c b/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/main.c
index fccd66d9b..6523b381c 100644
--- a/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/main.c
+++ b/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/voronoi.c b/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/voronoi.c
index 2ea00ef1f..5fc21f604 100644
--- a/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/voronoi.c
+++ b/example/min/helfrich_xin_consistency/C0_Nt1280/meyer_et_al_Kb001_Ka1/sphere/voronoi.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/helfrich_xin_consistency/main.c b/example/min/helfrich_xin_consistency/main.c
index 938b53e2a..b68837ce0 100644
--- a/example/min/helfrich_xin_consistency/main.c
+++ b/example/min/helfrich_xin_consistency/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/helfrich_xin_explore/main.c b/example/min/helfrich_xin_explore/main.c
index 4ff2716ea..edf37bb69 100644
--- a/example/min/helfrich_xin_explore/main.c
+++ b/example/min/helfrich_xin_explore/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static const real pi = 3.141592653589793115997964;
 
diff --git a/example/min/helfrich_xin_fa/main.c b/example/min/helfrich_xin_fa/main.c
index dbb6720bd..7e58acb9b 100644
--- a/example/min/helfrich_xin_fa/main.c
+++ b/example/min/helfrich_xin_fa/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/helfrich_xin_fag/main.c b/example/min/helfrich_xin_fag/main.c
index 34873ae3b..bf84929c8 100644
--- a/example/min/helfrich_xin_fag/main.c
+++ b/example/min/helfrich_xin_fag/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/helfrich_xin_fg/main.c b/example/min/helfrich_xin_fg/main.c
index f7ded7ec1..800e2097f 100644
--- a/example/min/helfrich_xin_fg/main.c
+++ b/example/min/helfrich_xin_fg/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/helfrich_xin_fga/main.c b/example/min/helfrich_xin_fga/main.c
index 93048eb69..c55d58286 100644
--- a/example/min/helfrich_xin_fga/main.c
+++ b/example/min/helfrich_xin_fga/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/juelicher/main.c b/example/min/juelicher/main.c
index 735f7a133..2a6d0c4c9 100644
--- a/example/min/juelicher/main.c
+++ b/example/min/juelicher/main.c
@@ -5,7 +5,7 @@
 #include <real.h>
 #include <co/err.h>
 #include <co/util.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/ddih.h>
 #include <co/tri.h>
diff --git a/example/min/kantor/main.c b/example/min/kantor/main.c
index fc0eda602..310177aa3 100644
--- a/example/min/kantor/main.c
+++ b/example/min/kantor/main.c
@@ -9,7 +9,7 @@
 #include <co/punto.h>
 #include <co/macro.h>
 #include <co/util.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #include <alg/x.h>
 #include <alg/min.h>
diff --git a/example/min/khairy/juelicher/main.c b/example/min/khairy/juelicher/main.c
index d61a62ad2..ec0e62912 100644
--- a/example/min/khairy/juelicher/main.c
+++ b/example/min/khairy/juelicher/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/khairy/meyer/main.c b/example/min/khairy/meyer/main.c
index 28c84234a..7d666a9fb 100644
--- a/example/min/khairy/meyer/main.c
+++ b/example/min/khairy/meyer/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/khairy_xin/main.c b/example/min/khairy_xin/main.c
index c6e637f1d..d9ef127e8 100644
--- a/example/min/khairy_xin/main.c
+++ b/example/min/khairy_xin/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/khairy_xin/meyer_xin_rv064/main.c b/example/min/khairy_xin/meyer_xin_rv064/main.c
index a796f19d7..89095685d 100644
--- a/example/min/khairy_xin/meyer_xin_rv064/main.c
+++ b/example/min/khairy_xin/meyer_xin_rv064/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/radius/main.c b/example/min/radius/main.c
index af8bbca7a..fb3a17843 100644
--- a/example/min/radius/main.c
+++ b/example/min/radius/main.c
@@ -7,7 +7,7 @@
 #include <co/vec.h>
 #include <co/punto.h>
 
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/min.h>
 #include <alg/x.h>
 
diff --git a/example/min/rbc/main.c b/example/min/rbc/main.c
index b348b78a1..0f4c9be30 100644
--- a/example/min/rbc/main.c
+++ b/example/min/rbc/main.c
@@ -22,7 +22,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/force.h>
 
 #define FMT_IN   CO_REAL_IN
diff --git a/example/min/rbc1/main.c b/example/min/rbc1/main.c
index efdf89a3a..b01b89a14 100644
--- a/example/min/rbc1/main.c
+++ b/example/min/rbc1/main.c
@@ -22,7 +22,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/force.h>
 
 #define FMT_IN   CO_REAL_IN
diff --git a/example/min/rbc1_Langevin/main.c b/example/min/rbc1_Langevin/main.c
index 5e020e0e2..7a0245288 100644
--- a/example/min/rbc1_Langevin/main.c
+++ b/example/min/rbc1_Langevin/main.c
@@ -22,7 +22,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/force.h>
 
 #define FMT_IN   CO_REAL_IN
diff --git a/example/min/rbc2/main.c b/example/min/rbc2/main.c
index efdf89a3a..b01b89a14 100644
--- a/example/min/rbc2/main.c
+++ b/example/min/rbc2/main.c
@@ -22,7 +22,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/force.h>
 
 #define FMT_IN   CO_REAL_IN
diff --git a/example/min/seven/main.c b/example/min/seven/main.c
index 3878e6e2d..9545d84ef 100644
--- a/example/min/seven/main.c
+++ b/example/min/seven/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #define FMT_IN   CO_REAL_IN
 
diff --git a/example/min/shear/main.c b/example/min/shear/main.c
index 5bd149673..794f2e08b 100644
--- a/example/min/shear/main.c
+++ b/example/min/shear/main.c
@@ -17,7 +17,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/shwell/main.c b/example/min/shwell/main.c
index 00a526978..8be275265 100644
--- a/example/min/shwell/main.c
+++ b/example/min/shwell/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/min/strain/main.c b/example/min/strain/main.c
index 5dc69ef29..3c742cb32 100644
--- a/example/min/strain/main.c
+++ b/example/min/strain/main.c
@@ -20,7 +20,7 @@
 #include <co/he.h>
 #include <co/bending.h>
 #include <co/force.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 #define FMT_IN   CO_REAL_IN
 
diff --git a/example/min/vesicle/main.c b/example/min/vesicle/main.c
index aeb5082b5..0cbb820c4 100644
--- a/example/min/vesicle/main.c
+++ b/example/min/vesicle/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static const real pi = 3.141592653589793115997964;
 
diff --git a/example/min/visc/main.c b/example/min/visc/main.c
index 5a2c4e2f0..a65c21fb5 100644
--- a/example/min/visc/main.c
+++ b/example/min/visc/main.c
@@ -15,7 +15,7 @@
 #include <co/strain.h>
 #include <co/util.h>
 #include <co/vec.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 static const real pi = 3.141592653589793115997964;
 static const real EPS = 1e-6;
diff --git a/example/min/xin/main.c b/example/min/xin/main.c
index dc997dfa5..7dd0ec8ba 100644
--- a/example/min/xin/main.c
+++ b/example/min/xin/main.c
@@ -18,7 +18,7 @@
 #include <co/ddih.h>
 #include <co/dtri.h>
 #include <co/bending.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <alg/x.h>
 #include <alg/min.h>
 
diff --git a/example/normal/local/main.c b/example/normal/local/main.c
index 05230a873..e3fca5e04 100644
--- a/example/normal/local/main.c
+++ b/example/normal/local/main.c
@@ -4,7 +4,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/tri.h>
 #include <co/memory.h>
diff --git a/example/shape/main.c b/example/shape/main.c
index df03687f5..c9d582aa4 100644
--- a/example/shape/main.c
+++ b/example/shape/main.c
@@ -4,7 +4,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 #include <co/vec.h>
 #include <co/ten.h>
 #include <co/tri.h>
diff --git a/example/valid/main.c b/example/valid/main.c
index e6cfc2f11..5d88349f2 100644
--- a/example/valid/main.c
+++ b/example/valid/main.c
@@ -1,7 +1,7 @@
 #include <stdio.h>
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 int main() {
     int v, v0, e, e0, t, t0;
diff --git a/example/volume0/main.c b/example/volume0/main.c
index 3ee14a02b..88acb0925 100644
--- a/example/volume0/main.c
+++ b/example/volume0/main.c
@@ -2,7 +2,7 @@
 
 #include <real.h>
 #include <co/err.h>
-/* #include <co/x.h> */
+#include <co/x.h>
 
 int main() {
     ini("/dev/stdin");