invert -gen-xxx to -no-gen-yyy
diff --git a/examples/sample.source.1609.2/Makefile b/examples/sample.source.1609.2/Makefile
index 9bb5387..14715be 100644
--- a/examples/sample.source.1609.2/Makefile
+++ b/examples/sample.source.1609.2/Makefile
@@ -11,7 +11,7 @@
 
 regen-makefile:
 	TITLE="IEEE 1609.2-2016 decoder" \
-	ASN_CMDOPTS="-pdu=auto -pdu=Ieee1609Dot2Data -fcompound-names -gen-OER" \
+	ASN_CMDOPTS="-pdu=auto -pdu=Ieee1609Dot2Data -fcompound-names" \
 	ASN_MODULES="../IEEE-1609.2-2016.asn1" \
 	ASN_PDU=Certificate \
 	ASN_PROGRAM=1609-2-dump \
diff --git a/examples/sample.source.J2735/Makefile b/examples/sample.source.J2735/Makefile
index efe9fa0..79570fe 100644
--- a/examples/sample.source.J2735/Makefile
+++ b/examples/sample.source.J2735/Makefile
@@ -11,7 +11,7 @@
 
 regen-makefile:
 	TITLE="J2735 DSRC decoder" \
-	ASN_CMDOPTS="-fcompound-names -gen-PER -pdu=all" \
+	ASN_CMDOPTS="-fcompound-names -pdu=auto" \
 	ASN_MODULES="../J2735_201603.asn1" \
 	ASN_PDU=MessageFrame \
 	ASN_PROGRAM=j2735-dump \
diff --git a/examples/sample.source.LTE-RRC/Makefile b/examples/sample.source.LTE-RRC/Makefile
index d918a97..1c4b2bb 100644
--- a/examples/sample.source.LTE-RRC/Makefile
+++ b/examples/sample.source.LTE-RRC/Makefile
@@ -3608,7 +3608,7 @@
 	make
 
 regen-makefile:
-	ASN_CMDOPTS="-pdu=auto -fcompound-names -gen-PER" \
+	ASN_CMDOPTS="-pdu=auto -fcompound-names -no-gen-OER" \
 	ASN_MODULES="../lte-rrc-14.2.1.asn1" \
 	ASN_PDU=DL-DCCH-Message \
 	ASN_PROGRAM=lte-rrc-dump \
diff --git a/examples/sample.source.ULP/Makefile b/examples/sample.source.ULP/Makefile
index 3e65fce..e666e3e 100644
--- a/examples/sample.source.ULP/Makefile
+++ b/examples/sample.source.ULP/Makefile
@@ -11,7 +11,7 @@
 
 regen-makefile:
 	TITLE="OMA UserPlane Location Protocol decoder" \
-	ASN_CMDOPTS="-pdu=SUPLINIT -fcompound-names -gen-PER" \
+	ASN_CMDOPTS="-pdu=SUPLINIT -fcompound-names -no-gen-OER" \
 	ASN_MODULES="../ulp.asn1" \
 	ASN_PDU=ULP-PDU \
 	ASN_PROGRAM=ulp-dump \