diff -Naur old/install-font.sh new/install-font.sh
--- old/install-font.sh	2020-04-01 16:11:12.000000000 -0400
+++ new/install-font.sh	2020-04-27 22:27:09.204599228 -0400
@@ -33,7 +33,7 @@
   printf <<EOF \
 "USAGE:
 
-    install-font.sh [-hHlscp] [-C \033[4mdir\033[0m] [-F \033[4mfamily\033[0m] \
+    install-font.sh [-hHlscpn] [-P \033[4mdir\033[0m] [-C \033[4mdir\033[0m] [-F \033[4mfamily\033[0m] \
 [-f \033[4mgroff fontname\033[0m] file1 file2 ...
 
 DESCRIPTION:
@@ -79,9 +79,12 @@
 
     -H  Long help.
 
-    -l  Assume prefix /usr/local/ for all directories. (default)
+    -l  Assume prefix /usr/local/share/groff for all directories. (default)
 
-    -s  Assume prefix /usr/ for all directories.
+    -s  Assume prefix /usr/share/groff for all directories.
+
+    -P  \033[4mdir\033[0m
+        Assume prefix \033[4mdir\033[0m for all directories.
 
     -c  Copy file(s) named on the command line to a system-accessible
         location.  If neither -s nor -C is given, copy to the family
@@ -93,6 +96,9 @@
         If neither -c nor -C is given, a prompt asks whether to copy
         the file(s) named on the command line.
 
+    -n  Don't copy file(s) named on the command line to a system-accessible
+        location.
+
     -d  Make font available to gropdf.
 
     -D  Do not make font available to gropdf.
@@ -158,18 +164,6 @@
   ;;
 esac
 
-# need write access to /usr/ and /usr/local/
-
-if [ "$UID" -ne "$ROOT_UID" ] ; then
-  scriptname=`basename $0`
-  printf \
-"Superuser priviledges required.\nRerun as \
-'\033[33msudo ${scriptname} \033[4margs\033[0m' \
-or \
-'\033[33msu root -c \"${scriptname} \033[4margs\033[0m\033[33m\"\033[0m'\n"
-  exit 126
-fi
-
 # if fontforge not installed, no point going any further
 
 type fontforge > /dev/null 2>&1 || { 
@@ -471,7 +465,7 @@
   :
 }
 
-while getopts ":C:cdDF:f:hHlps" opt
+while getopts ":C:cndDF:f:hHlpP:s" opt
 do
   case "$opt" in
     c)
@@ -484,6 +478,9 @@
       copy_dir=${OPTARG}
       [ -d ${copy_dir} ] || error no_dir
     ;;
+    n)
+      dont_copy=yes
+    ;;
     d)
       install_in_devpdf=yes 
     ;;
@@ -520,6 +517,11 @@
     l)
       loc_or_sysdir=/usr/local/share/groff
     ;;
+    P)
+      option=P
+      check_optarg
+      loc_or_sysdir=${OPTARG}
+    ;;
     p)
       alias mv='mv -i'
       alias ln='ln -i'
@@ -550,6 +552,19 @@
   exit 1
 }
 
+if [ ! -w "$loc_or_sysdir" ] ; then
+  # need write access to $loc_or_sysdir
+
+  scriptname=`basename $0`
+  printf \
+"You don't have write access to ${loc_or_sysdir}
+Superuser priviledges required.\nRerun as \
+'\033[33msudo ${scriptname} \033[4margs\033[0m' \
+or \
+'\033[33msu root -c \"${scriptname} \033[4margs\033[0m\033[33m\"\033[0m'\n"
+  exit 126
+fi
+
 devps=${loc_or_sysdir}/${version}/font/devps
 devpdf=${loc_or_sysdir}/${version}/font/devpdf
 site_font_devps=${loc_or_sysdir}/site-font/devps
@@ -629,24 +644,25 @@
 
 # copy input file to a system or named directory
 
-  if [ ! "$copy_orig" ] ; then
-    printf \
-"Copy \033[36m${file}\033[0m to ${copy_dir}/${family}/?\n  (y/n; default = n) "
-    read copy_file
+  if [ ! "$dont_copy" ] ; then
+    if [ ! "$copy_orig" ] ; then
+      printf \
+        "Copy \033[36m${file}\033[0m to ${copy_dir}/${family}/?\n  (y/n; default = n) "
+      read copy_file
 
-    case "$copy_file" in
-      Y | y | YES | Yes | yes)
-        copy_file
-      ;;
-      * )
-        printf \
-"Install \033[36m${file}\033[0m manually to make it available system-wide.\n"
-      ;;
-    esac
-  else
-    copy_file
+      case "$copy_file" in
+        Y | y | YES | Yes | yes)
+          copy_file
+        ;;
+        * )
+          printf \
+  "Install \033[36m${file}\033[0m manually to make it available system-wide.\n"
+        ;;
+      esac
+    else
+      copy_file
+    fi
   fi
-
   unset append_style
   unset ext
   unset font