non-existing cpp file in an open source project

[mojtabaavahdati]

I downloaded a c++ project and a "config.h" is included at the top of it, it also runs without any problems but I can't find neither the config.cpp nor the config.h among the files, why? It's an open source project by the way, so I think I should be able to find those. (Most of the functions in this project use other functions to do their jobs, those which I think should probably be defined in the config.cpp, that's why I need to find and take a look at it.)
(-:

[mbozzi]

I downloaded a c++ project

Which project?

Is config.h generated by autotools? (i.e., by ./configure?)

[mojtabaavahdati]

@mbozzi

Thanks, oh, sorry I didn't mention it. It's libcaca, an Ascii art generator, it's not an "only c++" project, though, but has a C++ version too.

and about autotools, I'm not sure what you're talking about, but I use GNU g++ and tried the "make" command in that directory and it says "no makefiles found", this is while I can see two Makefile.am and Makefile.in files. It might not be relevant to what you asked, though, I'm such a newbie ;)

[Enoizat]

I’ve downloaded and extracted on my W7 machine the file
libcaca-0.99.beta19.tar.gz
from here:
http://caca.zoy.org/wiki/libcaca

If it’s the same you downloaded, there’s a “config.h” file in the sub-directory win32.
It contains a list of #define, but no function prototypes or class declarations. It means is a sort of ‘generic’ header, not connected with a specific .cpp file.
Actually it seems all these files include “config.h”:

caca++.cpp
conio.c
demo.c
demo0.c
dithering.c
event.c
font.c
font2tga.c
frames.c
fullwidth.c
input.c
mouse.c
spritedit.c
text.c
blit.c
canvas.c
colors.c
driver.c
figfont.c
gamma.c
import.c
swallow.c
transform.c
truecolor.c
configure
export.c
hsv.c
trifiller.c
unicode.c
caca_conio.c
caca0.c
dither.c
event.c
getopt.c
import.c
line.c
text.c
time.c
box.c
caca.c
charset.c
export.c
font.c
prof.c
attr.c
conic.c
conio.c
figfont.c
frame.c
gl.c
graphics.c
raw.c
string.c
transform.c
vga.c
canvas.c
cocoa.m
dirty.c
file.c
legacy.c
ncurses.c
null.c
slang.c
triangle.c
win32.c
x11.c
canvas.cpp
export.cpp
simple.c
bench.c
caca-test.cpp
cacaclock.c
common-image.c
dirty.cpp
driver.cpp
aafire.c
cacademo.c
cacadraw.c
cacaplay.c
cacaserver.c
cacaview.c
img2txt.c
kernel.c
makefont.c
optipal.c
sortchars.c


It’s possible that other config.h files are created during installation, as mbozzi said.