diff --git a/Viewer/Makefile b/Viewer/Makefile
index 079258d6..8a8e704d 100644
--- a/Viewer/Makefile
+++ b/Viewer/Makefile
@@ -399,7 +399,7 @@ PATCHES := $(REQUREJS)
 #**********************************************************************
 # dependencies to check...
 #
-DEPENDENCIES_HELP = sed grep egrep fgrep printf 
+DEPENDENCIES_HELP = sed grep printf 
 DEPENDENCIES_WEB = node npm npx
 
 DEPENDENCIES = $(DEPENDENCIES_WEB) \
@@ -423,9 +423,9 @@ DEPENDENCIES = $(DEPENDENCIES_WEB) \
 help: ## Print make target help and exit
 help:
 	@IFS=$$'\n' ; \
-	help_lines=(`fgrep -h "##" $(MAKEFILE_LIST) \
-		| fgrep -v fgrep \
-		| fgrep -v '"##' \
+	help_lines=(`grep -Fh "##" $(MAKEFILE_LIST) \
+		| grep -Fv grep \
+		| grep -Fv '"##' \
 		| sed -e 's/\\$$//'`); \
 	for help_line in $${help_lines[@]}; do \
 		IFS=$$'#' ; \
@@ -455,7 +455,7 @@ doc/MAKE: Makefile
 		echo ; \
 		echo "---" ; \
 		echo "This file was generated by: make $@" ; \
-	} | egrep -v "^make\[1\]:" > $@
+	} | grep -Ev "^make\[1\]:" > $@
 
 
 .PHONY: version