exit Compile 
    Compiling tex4ht.c
-  You might want to activate some of the options at the start of the file by uncommenting the corresponding
lines.
/* ********************************************** 
 Compiler options                            *
 (uncommented | command line)                *
 ------------------------------------------------*
 Classic C (CC)             default
 #define ANSI                      ansi-c, c++
 #define DOS_C
 #define HAVE_STRING_H             <string.h>
 #define HAVE_DIRENT_H             <dirent.h>
 #define HAVE_SYS_NDIR_H           <sys/ndir.h>
 #define HAVE_SYS_DIR_H            <sys/dir.h>
 #define HAVE_NDIR_H               <dir.h>
 #define WIN32
 #define KPATHSEA
 #define BCC32                    bordland c++
 
 *************************************************
 
 
-        Values may be assigned in the command line or the beginning of the source file, to the environment variables
ENVFILE, HTFDIR, LGPIC, LGSEP, LGTYP, MAXFONTS, and TFMDIR.
    For instance,
     cc -o tex4ht tex4ht.c -DENVFILE='"path/tex4ht.dir/texmf/tex4ht/base/unix/tex4ht.env"'
-DHAVE_DIRENT_H
 
    The switch ‘-DENVFILE’ is optional, if the program can reach the environment file in an alternative
manner.
    Compiling t4ht.c
    The environment variable ENVFILE is available also in ‘t4ht.c’.
    For instance,
    cc -o t4ht t4ht.c -DENVFILE='"gold/tex4ht.dir/texmf/tex4ht/base/unix/tex4ht.env"'