diff --git a/scripts/makefile.std b/scripts/makefile.std
index 25924e7..eec63b0 100644
--- a/scripts/makefile.std
+++ b/scripts/makefile.std
@@ -36,10 +36,9 @@
 LN_SF = ln -sf
 RANLIB = ranlib
 CP = cp
+MV_F = mv -f
 RM_F = rm -f
 AWK = awk
-SED = sed
-ECHO = echo
 
 DFNFLAGS = # DFNFLAGS contains -D options to use in the libpng build
 DFA_EXTRA = # extra files that can be used to control configuration
@@ -65,21 +64,21 @@
 # copy this if the following doesn't work.
 pnglibconf.h: pnglibconf.dfn
 	$(RM_F) $@ pnglibconf.c pnglibconf.out pnglibconf.tmp
-	$(ECHO) '#include "pnglibconf.dfn"' >pnglibconf.c
-	$(ECHO) "If '$(CC) -E' crashes try /lib/cpp (e.g. CPP='/lib/cpp')" >&2
+	echo '#include "pnglibconf.dfn"' >pnglibconf.c
+	@echo "## If '$(CC) -E' fails, try /lib/cpp (e.g. CPP='/lib/cpp')" >&2
 	$(CPP) $(DFNFLAGS) pnglibconf.c >pnglibconf.out
-	$(AWK) -f "scripts/dfn.awk" out="pnglibconf.tmp" pnglibconf.out 1>&2
-	mv pnglibconf.tmp $@
+	$(AWK) -f scripts/dfn.awk out=pnglibconf.tmp pnglibconf.out >&2
+	$(MV_F) pnglibconf.tmp $@
 
 pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h pngusr.dfa $(DFA_XTRA)
 	$(RM_F) $@ pnglibconf.pre pnglibconf.tmp
-	$(ECHO) "Calling $(AWK) from scripts/pnglibconf.mak" >&2
-	$(ECHO) "If 'awk' crashes try a better awk (e.g. AWK='nawk')" >&2
-	$(AWK) -f scripts/options.awk out="pnglibconf.pre"\
+	@echo "## Calling $(AWK) from scripts/pnglibconf.mak" >&2
+	@echo "## If 'awk' fails, try a better awk (e.g. AWK='nawk')" >&2
+	$(AWK) -f scripts/options.awk out=pnglibconf.pre\
 	    version=search pngconf.h scripts/pnglibconf.dfa\
-	    pngusr.dfa $(DFA_XTRA) 1>&2
-	$(AWK) -f scripts/options.awk out="pnglibconf.tmp" pnglibconf.pre 1>&2
-	mv pnglibconf.tmp $@
+	    pngusr.dfa $(DFA_XTRA) >&2
+	$(AWK) -f scripts/options.awk out=pnglibconf.tmp pnglibconf.pre >&2
+	$(MV_F) pnglibconf.tmp $@
 
 libpng.a: $(OBJS)
 	$(AR_RC) $@ $(OBJS)
diff --git a/scripts/pnglibconf.mak b/scripts/pnglibconf.mak
index c125ca2..34a240e 100755
--- a/scripts/pnglibconf.mak
+++ b/scripts/pnglibconf.mak
@@ -11,12 +11,12 @@
 AWK = mawk
 AWK = nawk
 AWK = one-true-awk
-AWK = awk  # Crashes on SunOS 5.10 - use 'nawk'
-CPP = $(CC) -E # On SUN OS 5.10 if this causes problems use /lib/cpp
+AWK = awk      # This fails on SunOS 5.10; use 'nawk'
+CPP = $(CC) -E # If this fails on SunOS 5.10, use '/lib/cpp'
 
-MOVE = mv
+MOVE = mv -f
 DELETE = rm -f
-ECHO = echo
+
 DFA_XTRA = # Put your configuration file here, see scripts/pnglibconf.dfa.  Eg:
 # DFA_XTRA = pngusr.dfa
 
@@ -25,27 +25,27 @@
 # as appropriate
 DFNFLAGS = $(DEFS) $(CPPFLAGS) $(CFLAGS)
 
-# srcdir is a defacto standard for the location of the source
+# srcdir is a de-facto standard for the location of the source
 srcdir = .
 
 # The standard pnglibconf.h exists as scripts/pnglibconf.h.prebuilt,
 # copy this if the following doesn't work.
 pnglibconf.h: pnglibconf.dfn
 	$(DELETE) $@ pnglibconf.c pnglibconf.out pnglibconf.tmp
-	$(ECHO) '#include "pnglibconf.dfn"' >pnglibconf.c
-	$(ECHO) "If '$(CC) -E' crashes try /lib/cpp (e.g. CPP='/lib/cpp')" >&2
+	echo '#include "pnglibconf.dfn"' >pnglibconf.c
+	@echo "## If '$(CC) -E' fails, try /lib/cpp (e.g. CPP='/lib/cpp')" >&2
 	$(CPP) $(DFNFLAGS) pnglibconf.c >pnglibconf.out
-	$(AWK) -f "$(srcdir)/scripts/dfn.awk" out="pnglibconf.tmp" pnglibconf.out 1>&2
+	$(AWK) -f $(srcdir)/scripts/dfn.awk out=pnglibconf.tmp pnglibconf.out >&2
 	$(MOVE) pnglibconf.tmp $@
 
 pnglibconf.dfn: $(srcdir)/scripts/pnglibconf.dfa $(srcdir)/scripts/options.awk $(srcdir)/pngconf.h $(srcdir)/pngusr.dfa $(DFA_XTRA)
 	$(DELETE) $@ pnglibconf.pre pnglibconf.tmp
-	$(ECHO) "Calling $(AWK) from scripts/pnglibconf.mak" >&2
-	$(ECHO) "If 'awk' crashes try a better awk (e.g. AWK='nawk')" >&2
-	$(AWK) -f $(srcdir)/scripts/options.awk out="pnglibconf.pre"\
+	@echo "## Calling $(AWK) from scripts/pnglibconf.mak" >&2
+	@echo "## If 'awk' fails, try a better awk (e.g. AWK='nawk')" >&2
+	$(AWK) -f $(srcdir)/scripts/options.awk out=pnglibconf.pre\
 	    version=search $(srcdir)/pngconf.h $(srcdir)/scripts/pnglibconf.dfa\
-	    $(srcdir)/pngusr.dfa $(DFA_XTRA) 1>&2
-	$(AWK) -f $(srcdir)/scripts/options.awk out="pnglibconf.tmp" pnglibconf.pre 1>&2
+	    $(srcdir)/pngusr.dfa $(DFA_XTRA) >&2
+	$(AWK) -f $(srcdir)/scripts/options.awk out=pnglibconf.tmp pnglibconf.pre >&2
 	$(MOVE) pnglibconf.tmp $@
 
 clean-pnglibconf: