make
-in the dss source directory to build the dss executable and the
-man page. Then type
+in the dss source directory to build the dss executable and the man
+page. If lopsub is installed in a non-standard path, you may need to
+run `make` as follows:
+
+ make CPPFLAGS=-I$HOME/lopsub/include LDFLAGS=-L$HOME/lopsub/lib
+
+Then type
sudo make install