diff --git a/src/Rules.AIX64.mk b/src/Rules.AIX64.mk
index 9bf3b126250bb8560c28c81ffbee6b16bb9c8dbc..9c499de3e3f9c8609960d69a458140c27c80b2b9 100644
--- a/src/Rules.AIX64.mk
+++ b/src/Rules.AIX64.mk
@@ -109,7 +109,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXNAGfor.mk b/src/Rules.LXNAGfor.mk
index 397a18c4fa1ab0b4266c50599445aa90ceb39158..b97592ba51466ea37e556e6c83efca3c7ebd59e3 100644
--- a/src/Rules.LXNAGfor.mk
+++ b/src/Rules.LXNAGfor.mk
@@ -102,7 +102,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXarm.mk b/src/Rules.LXarm.mk
index dc9369223509966465fe8a676060059b93ed8bed..57e2a5d00ac7433edbd44ca72c238c31cdbbd85d 100644
--- a/src/Rules.LXarm.mk
+++ b/src/Rules.LXarm.mk
@@ -124,7 +124,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXcray.mk b/src/Rules.LXcray.mk
index 425a0b9d6da6197508fdd8d3e25afd3dcc8b7c42..05350702097694d3f8697ff9cd0352de027bdf2e 100644
--- a/src/Rules.LXcray.mk
+++ b/src/Rules.LXcray.mk
@@ -117,7 +117,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXg95.mk b/src/Rules.LXg95.mk
index e08e73ed75281d94524b45695a2634d380af0e83..aaae21f0ce81c7280b13c24dc6961ebc9722f34f 100644
--- a/src/Rules.LXg95.mk
+++ b/src/Rules.LXg95.mk
@@ -89,7 +89,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXgfortran.mk b/src/Rules.LXgfortran.mk
index 58689e968d55c3458543ae29494fd714ff26c850..b6014a2c7abfd2a95741417d5c42d045b27c639d 100644
--- a/src/Rules.LXgfortran.mk
+++ b/src/Rules.LXgfortran.mk
@@ -118,7 +118,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXifort.mk b/src/Rules.LXifort.mk
index 231f1949a8004799c79516f3cb661d12bde64c9b..bc4573d96866e4c041a24a6f5d81391d286ea4ca 100644
--- a/src/Rules.LXifort.mk
+++ b/src/Rules.LXifort.mk
@@ -213,7 +213,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXpathf95.mk b/src/Rules.LXpathf95.mk
index fe34aa46796746ba81eef9e0bef6a5d79c827d44..3939ffa7e3704f97d40838949f77aaf0d4c9dbcb 100644
--- a/src/Rules.LXpathf95.mk
+++ b/src/Rules.LXpathf95.mk
@@ -65,7 +65,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #
diff --git a/src/Rules.LXpgi.mk b/src/Rules.LXpgi.mk
index 498f56f7b0b8b576dcb7f715e8e06191f1b59dc9..2f5c65277797dd1b7241e7859cc4b19fc7244c41 100644
--- a/src/Rules.LXpgi.mk
+++ b/src/Rules.LXpgi.mk
@@ -124,7 +124,7 @@ MNH_COMPRESS=yes
 ## S4PY flag
 #
 #if MNH_S4PY exists => compile the libs4py library (for epygram)
-MNH_S4PY=yes
+#MNH_S4PY=no
 #
 ##########################################################
 #                                                        #