Just use the text2pdf , which is free and opensource.
At the link you can download the source or the pre-compiled binary for windows, solaris, dos.
I'm able to use it into AIX OS without problem.
Very simple to compile , just save the text2pdf.c and Makefile into the same directory and type
make. (here I set the variable CC=gcc on AIX, on linux this will not be an issue)
$ ./text2pdf -h
text2pdf [options] [filename]
text2pdf makes a 7-bit clean PDF file (version 1.1) from any input file.
It reads from standard input or a named file, and writes the PDF file
to standard output.
There are various options as follows:
-h show this message
-f<font> use PostScript <font> (must be in standard 14, default: Courier)
-I use ISOLatin1Encoding
-s<size> use font at given pointsize (default 10)
-v<dist> use given line spacing (default 12 points)
-l<lines> lines per page (default 60, determined automatically
-c<chars> maximum characters per line (default 80)
-t<spaces> spaces per tab character (default 8)
-F ignore formfeed characters (^L)
-A4 use A4 paper (default Letter)
-A3 use A3 paper (default Letter)
-x<width> independent paper width in points
-y<height> independent paper height in points
-2 format in 2 columns
-L landscape mode
Note that where one variable is implied by two options, the second option
takes precedence for that variable. (e.g. -A4 -y500)
In landscape mode, page width and height are simply swapped over before
formatting, no matter how or when they were defined.
text2pdf v1.1 (c) Phil Smith, 1996
$ ./text2pdf -f"Courier" -s6 -c216 -v6 -L -A4 ./rep3.txt >rep3.pdf