Added missing Makefile patch

Author: migueldgoncalves

README.md

@@ -3,10 +3,10 @@ Experiments on integration of Python extensions with C++ OSPF base implementatio
 
 The base code is the Release 2.16 of the ospfd routing software created by John T. Moy, and described in the book [OSPF Complete Implementation](https://dl.acm.org/doi/book/10.5555/1481642).
 
-Executed in Docker containers running Ubuntu 16.04.
+Executed in Docker containers running Ubuntu 16.04 integrated with GNS3.
 
 ## See also
 
 * <http://www.ospf.org> - Original source code by John T. Moy, and respective patches
 
-* <https://github.com/pfa/ospfd-diffs> - Most of required patches to run base code in Ubuntu 16.04
+* <https://github.com/pfa/ospfd-diffs> - Most of required changes to run base code in Ubuntu 16.04

linux/Makefile

@@ -3,8 +3,8 @@ vpath %.C .:../src
 vpath %.c ../src/contrib
 
 INSTALL_DIR = /usr/sbin
-CGI_DIR = /home/httpd/cgi-bin
-CPPFLAGS = -I. -I../src -I/usr/local/include
+CGI_DIR = /usr/lib/cgi-bin
+CPPFLAGS = -I. -I../src -I/usr/local/include "-DUSE_INTERP_ERRORLINE" # ErrorLine is deprecated, requires flag
 CXXFLAGS = -O -g -Wall -Woverloaded-virtual -Wcast-qual -Wuninitialized
 CFLAGS = -O -g -Wall -Woverloaded-virtual -Wcast-qual -Wuninitialized