Don't define an empty CFLAGS, it's much more honest not to defined it at all.

Make sure to remove any [.CRYTO]BUILDINF.H so it doesn't get used instead of
[.''ARCH'.CRYPTO]BUILDINF.H

makevms.com

@@ -382,7 +382,7 @@ $ TIME = F$TIME()
 $!
 $! Write The [.xxx.CRYPTO]BUILDINF.H File.
 $!
-$ WRITE H_FILE "#define CFLAGS """" /* Not filled in for now */"
+$! WRITE H_FILE "#define CFLAGS """" /* Not filled in for now */"
 $ WRITE H_FILE "#define PLATFORM ""VMS ''ARCH' ''VMS_VER'"""
 $ WRITE H_FILE "#define DATE ""''TIME'"" "
 $!
@@ -394,6 +394,11 @@ $! Purge The [.xxx.CRYPTO]BUILDINF.H File.
 $!
 $ PURGE SYS$DISK:[.'ARCH'.CRYPTO]BUILDINF.H
 $!
+$! Delete [.CRYPTO]BUILDINF.H File, as there might be some residue from Unix.
+$!
+$ IF F$SEARCH("[.CRYPTO]BUILDINF.H") .NES. "" THEN -
+     DELETE SYS$DISK:[.CRYPTO]BUILDINF.H;*
+$!
 $! That's All, Time To RETURN.
 $!
 $ RETURN