diff --git a/skel/make.sh b/skel/make.sh
index 47a4210..ca8d7f3 100755
--- a/skel/make.sh
+++ b/skel/make.sh
@@ -48,6 +48,8 @@ OUTPUT_DIRS="obj html"
 #  MONOLITHIC_TESTS       if any file mentioned in this list is newer
 #                         than the output file, then we recreate it
 #  MONOLITHIC_SOURCE      a list (in order) of the source files
+#  MONOLITHIC_OPTIONS     will #define the options to match the respective
+#                         environment variables.
 #
 # Recognised formats are:
 #  none                   no special processing happens before each file
@@ -68,18 +70,21 @@ make_monolithic() {
     # extract options
     HASHLINE=0
     VERDEFINE=0
+    HASHDEFINE=0
     if [ "$2" == "C" ]
     then
         HASHLINE=1
         VERDEFINE=1
+        HASHDEFINE=1
     elif [ "$2" == "Ch" ]
     then
         HASHLINE=1
+        HASHDEFINE=1
     elif [ "$2" == "none" ]
     then
-            HASHLINE=0 # dummy command
+        HASHLINE=0 # dummy command
     else
-            print_failure "make_monolithic() called with unknown format $2"
+        print_failure "make_monolithic() called with unknown format $2"
         return 1
     fi
 
@@ -115,6 +120,14 @@ make_monolithic() {
             do_cmd_redir ${MONOLITHIC_OUT} echo "#define VEREXTRA \"${VEREXTRA}\"" || return 1
         fi
 
+        if [ ${HASHDEFINE} -ne 0 ]
+        then
+            for opt in ${MONOLITHIC_OPTIONS}
+            do
+                do_cmd_redir ${MONOLITHIC_OUT} echo "#define ${opt} ${!opt}" || return 1
+            done
+        fi
+
         for FILE in ${MONOLITHIC_SOURCE}
         do
             if [ ${HASHLINE} -ne 0 ]