diff --git a/Makefile.generated_files b/Makefile.generated_files
index 13a4bbb..a4ea832 100644
--- a/Makefile.generated_files
+++ b/Makefile.generated_files
@@ -156,7 +156,7 @@ $(foreach dir, $(ALL_GO_DIRS), $(eval           \
 # is what the .stamp file represents.
 $(foreach dir, $(ALL_GO_DIRS),  \
     $(META_DIR)/$(dir)/$(GOFILES_META)):
-	FILES=$$(ls $</*.go | grep --color=never -v $(GENERATED_FILE_PREFIX));  \
+	FILES=$$(ls $</*.go | grep -v $(GENERATED_FILE_PREFIX));  \
 	mkdir -p $(@D);                                           \
 	echo "gofiles__$< := $$(echo $${FILES})" >$@.tmp;         \
 	cmp -s $@.tmp $@ || touch $@.stamp;                       \
@@ -182,7 +182,7 @@ ifeq ($(DBG_MAKEFILE),1)
 endif
 ALL_K8S_TAG_FILES := $(shell                             \
     find $(ALL_GO_DIRS) -maxdepth 1 -type f -name \*.go  \
-        | xargs grep --color=never -l '^// *+k8s:'       \
+        | xargs grep -l '^// *+k8s:'       \
 )
 
 #
@@ -209,7 +209,7 @@ ifeq ($(DBG_MAKEFILE),1)
     $(warning ***** finding all +k8s:deepcopy-gen tags)
 endif
 DEEPCOPY_DIRS := $(shell                                             \
-    grep --color=never -l '+k8s:deepcopy-gen=' $(ALL_K8S_TAG_FILES)  \
+    grep -l '+k8s:deepcopy-gen=' $(ALL_K8S_TAG_FILES)  \
         | xargs -n1 dirname                                          \
         | LC_ALL=C sort -u                                           \
 )
@@ -278,7 +278,7 @@ $(META_DIR)/$(DEEPCOPY_GEN).mk:
 	 INDIRECT=$$(go list                                   \
 	     -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}'          \
 	     ./cmd/libs/go2idl/deepcopy-gen                    \
-	     | grep --color=never "^$(PRJ_SRC_PATH)"           \
+	     | grep "^$(PRJ_SRC_PATH)"           \
 	     | sed 's|^$(PRJ_SRC_PATH)|./|'                    \
 	     | xargs go list -f '{{.Dir}} {{.Dir}}/*.go');     \
 	 echo $$DIRECT $$INDIRECT                              \
@@ -334,7 +334,7 @@ ifeq ($(DBG_MAKEFILE),1)
     $(warning ***** finding all +k8s:defaulter-gen tags)
 endif
 DEFAULTER_DIRS := $(shell                                            \
-    grep --color=never -l '+k8s:defaulter-gen=' $(ALL_K8S_TAG_FILES) \
+    grep -l '+k8s:defaulter-gen=' $(ALL_K8S_TAG_FILES) \
         | xargs -n1 dirname                                          \
         | LC_ALL=C sort -u                                           \
 )
@@ -429,7 +429,7 @@ $(META_DIR)/$(DEFAULTER_GEN).mk:
 	 INDIRECT=$$(go list                                   \
 	     -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}'          \
 	     ./cmd/libs/go2idl/defaulter-gen                   \
-	     | grep --color=never "^$(PRJ_SRC_PATH)"           \
+	     | grep "^$(PRJ_SRC_PATH)"           \
 	     | sed 's|^$(PRJ_SRC_PATH)|./|'                    \
 	     | xargs go list -f '{{.Dir}} {{.Dir}}/*.go');     \
 	 echo $$DIRECT $$INDIRECT                              \
@@ -475,7 +475,7 @@ ifeq ($(DBG_MAKEFILE),1)
     $(warning ***** finding all +k8s:openapi-gen tags)
 endif
 OPENAPI_DIRS := $(shell                                             \
-    grep --color=never -l '+k8s:openapi-gen=' $(ALL_K8S_TAG_FILES)  \
+    grep -l '+k8s:openapi-gen=' $(ALL_K8S_TAG_FILES)  \
         | xargs -n1 dirname                                         \
         | LC_ALL=C sort -u                                          \
 )
@@ -536,7 +536,7 @@ $(META_DIR)/$(OPENAPI_GEN).mk:
 	 INDIRECT=$$(go list                                   \
 	     -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}'          \
 	     ./cmd/libs/go2idl/openapi-gen                     \
-	     | grep --color=never "^$(PRJ_SRC_PATH)"           \
+	     | grep "^$(PRJ_SRC_PATH)"           \
 	     | sed 's|^$(PRJ_SRC_PATH)|./|'                    \
 	     | xargs go list -f '{{.Dir}} {{.Dir}}/*.go');     \
 	 echo $$DIRECT $$INDIRECT                              \
@@ -593,7 +593,7 @@ ifeq ($(DBG_MAKEFILE),1)
     $(warning ***** finding all +k8s:conversion-gen tags)
 endif
 CONVERSION_DIRS := $(shell                                              \
-    grep --color=never '^// *+k8s:conversion-gen=' $(ALL_K8S_TAG_FILES) \
+    grep '^// *+k8s:conversion-gen=' $(ALL_K8S_TAG_FILES) \
         | cut -f1 -d:                                                   \
         | xargs -n1 dirname                                             \
         | LC_ALL=C sort -u                                              \
@@ -651,7 +651,7 @@ $(foreach dir, $(CONVERSION_DIRS), $(eval           \
 # is what the .stamp file represents.
 $(foreach dir, $(CONVERSION_DIRS),  \
     $(META_DIR)/$(dir)/$(CONVERSIONS_META)):
-	TAGS=$$(grep --color=never -h '^// *+k8s:conversion-gen=' $</*.go   \
+	TAGS=$$(grep -h '^// *+k8s:conversion-gen=' $</*.go   \
 	    | cut -f2- -d=                                                  \
 	    | sed 's|$(PRJ_SRC_PATH)/||');                                  \
 	mkdir -p $(@D);                                                     \
@@ -731,7 +731,7 @@ $(META_DIR)/$(CONVERSION_GEN).mk:
 	 INDIRECT=$$(go list                                   \
 	     -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}'          \
 	     ./cmd/libs/go2idl/conversion-gen                  \
-	     | grep --color=never "^$(PRJ_SRC_PATH)"           \
+	     | grep "^$(PRJ_SRC_PATH)"           \
 	     | sed 's|^$(PRJ_SRC_PATH)|./|'                    \
 	     | xargs go list -f '{{.Dir}} {{.Dir}}/*.go');     \
 	 echo $$DIRECT $$INDIRECT                              \