Does not compile without libconfig++ library

[GoogleCodeExporter]

What steps will reproduce the problem?
1. run make
2.
3.

What is the expected output? What do you see instead?

expected to build or complain about required dependencies not met.

what I see is that it says it will build without the audible beep but fails to 
build:

$ make
libraries.mk:30: IMPORTANT: The libconfig++ library was not detected in the 
system. The installation will continue but the audible beep in the terminal 
will not be avaliable

Vintage Terminal build options:
CXXFLAGS = -DVERSION="0.5.0" -DDATADIR="/usr/local/share/vinterm" -pedantic 
-Wall -I. -I/usr/include -std=c++0x -g -O0 -DDEBUG -I/usr/include/SDL 
-D_GNU_SOURCE=1 -D_REENTRANT -D_SDL   -DAO
LDFLAGS  = -L/usr/lib -lutil -g -L/usr/lib64 -Wl,-rpath,/usr/lib64 -lSDL 
-lpthread -lao   -lX11
CC       = g++
CC options.cc
options.cc:9:25: fatal error: libconfig.h++: No such file or directory
 #include <libconfig.h++>
                         ^
compilation terminated.
make: *** [options.o] Error 1

What version of the product are you using? On what operating system?

vinterm-0.5.0 on slackware 14.1 x86_64.

Please provide any additional information below.

Original issue reported on code.google.com by dustin.i...@gmail.com on 16 Apr 2014 at 9:38

[GoogleCodeExporter]

Funny enough, as some might guess, libconfig++ does not give you sound. Patch 
to compile without libconfig++ is here: http://pastebin.com/zyjE8UKX 

However, I'm unsure what functionality will break as a result of no 
libconfig++. Use at your own risk.

Original comment by jbusch...@gmail.com on 5 Aug 2014 at 6:50