perl___ - cannot fork, can dynalink.
The build of the first one - perl - is rather convoluted, and
requires a build of miniperl_.
+
+after 5.003_07:
+ custom tmpfile and tmpname which may use $TMP, $TEMP.
+ all the calls to OS/2 API wrapped so that it is safe to use
+ them under DOS (may die(), though).
+ Tested that popen works under DOS with modified PDKSH and RSX.
+ File::Copy works under DOS.
+ MakeMaker modified to work under DOS (perlmain.c.tmp and sh -c true).
+
+after 5.003_08:
+ OS2::PrfDB exports symbols as documented;
+ should work on OS/2 2.1 again.
+ uses reliable signals when spawing.
+ do not use popen() any more - no intermediate shell unless needed.
+
+after 5.003_11:
+ Functions emx_{malloc,realloc,calloc,free} are exported from DLL.
+ get_sysinfo() bugs corrected (flags were not used and wrongly defined).
+
+after 5.003_20:
+ _isterm is substituted instead of isatty, s?random instead of srand.
+ `register' disabled if -DDEBUGGING and not AOUT build: stupid SD386.
+ 3-argument select() was stomping over memory.