Undo Brian's last commit as it was broken (removes Linux support, ...)

configure.in

@@ -268,22 +268,18 @@ AC_INIT(c/scheme48vm.c)
      AIX_P="exportlist.aix"
      ;;
 
-  ## NetBSD, FreeBSD, OpenBSD, Darwin/MacOS X ( and maybe 386BSD also)
-    *-*-*bsd*|*-*-darwin* )
-    dir=bsd
-    SCSH_ELF
+  ## Linux
+  *-*-linux* )
+  dir=linux
+  # gross, but needed for some older a.out systems for 0.4.x
+  LIBS=-lc
+  SCSH_ELF
   ;;
 
-  ## interix (aka Microsoft Windows Services for Unix)
-  *-*-interix* )
-    dir=bsd
-    AC_DEFINE(_ALL_SOURCE, 1, [Define to 1 on interix to get MAXHOSTNAMELEN])
-  ;;
-
-  ## NetBSD, FreeBSD, OpenBSD, Darwin/MacOS X ( and maybe 386BSD also)
-    *-*-*bsd*|*-*-darwin* )
-    dir=bsd
-    SCSH_ELF
+  ## NetBSD and FreeBSD ( and maybe 386BSD also)
+  *-*-*bsd*|*-*-darwin* )
+  dir=bsd
+  SCSH_ELF
   ;;
 
   ## NeXT
@@ -308,6 +304,7 @@ AC_INIT(c/scheme48vm.c)
   ## Solaris - Sparc and i386
     *-*-solaris* )
     dir=solaris
+    AC_DEFINE(HAVE_NLIST)
     ;;
   
   ## NT - cygwin32
@@ -347,8 +344,10 @@ esac
      S48_POSIX_LIBC
      AC_CONST
      AC_RETSIGTYPE
-     AC_CHECK_HEADERS(sys/select.h crypt.h)
-     AC_CHECK_FUNCS(select sigaction vasprintf sync)
+     AC_CHECK_HEADERS(libgen.h sys/timeb.h posix/time.h sys/select.h nlist.h)
+     AC_CHECK_HEADERS(sys/un.h)
+     AC_CHECK_HEADERS(crypt.h)	
+     AC_CHECK_FUNCS(gettimeofday ftime nlist select setitimer sigaction vasprintf)
      SCSH_SOCKLEN_T	
      AC_CHECK_FUNC(dlopen, [AC_DEFINE(HAVE_DLOPEN, 
 				1, [Define to 1 if the interface to the dynamic linker exists])
@@ -356,7 +355,7 @@ esac
 			   [AC_CHECK_FUNC(nlist, [AC_LIBOBJ([c/fake/libdl1])],
 	       					 [AC_LIBOBJ([c/fake/libdl2])])
                             have_dlopen="no"])
-     AC_CHECK_FUNCS()
+     AC_CHECK_FUNCS(socket chroot)
      AC_CHECK_FUNC(strerror, AC_DEFINE(HAVE_STRERROR, 
 					1, [Define to 1 if you have the strerror function]),
 			      [AC_LIBOBJ([c/fake/strerror])])