diff -uNr parallel/src/parallel parallel.mod/src/parallel
--- parallel/src/parallel	2023-09-28 21:55:48.803300511 +0800
+++ parallel.mod/src/parallel	2023-09-28 21:58:17.203300520 +0800
@@ -2241,7 +2241,7 @@
     ## Shell
     #
     $Global::shell = $ENV{'PARALLEL_SHELL'} || parent_shell($$)
-	|| $ENV{'SHELL'} || "/bin/sh";
+	|| $ENV{'SHELL'} || "@TERMUX_PREFIX@/bin/sh";
     if(not -x $Global::shell and not which($Global::shell)) {
 	::error("Shell '$Global::shell' not found.");
 	wait_and_exit(255);
@@ -2917,14 +2917,14 @@
     $Global::trim = 'n';
     $Global::max_jobs_running = 0;
     $Global::job_already_run = '';
-    $ENV{'TMPDIR'} ||= "/tmp";
-    $ENV{'PARALLEL_REMOTE_TMPDIR'} ||= "/tmp";
+    $ENV{'TMPDIR'} ||= "@TERMUX_PREFIX@/tmp";
+    $ENV{'PARALLEL_REMOTE_TMPDIR'} ||= "@TERMUX_PREFIX@/tmp";
     # bug #55398: set $OLDPWD when using --wd
     $ENV{'OLDPWD'} = $ENV{'PWD'};
     if(not $ENV{HOME}) {
 	# $ENV{HOME} is sometimes not set if called from PHP
-	::warning("\$HOME not set. Using /tmp.");
-	$ENV{HOME} = "/tmp";
+	::warning("\$HOME not set. Using @TERMUX_PREFIX@/tmp.");
+	$ENV{HOME} = "@TERMUX_PREFIX@/tmp";
     }
     # no warnings to allow for undefined $XDG_*
     no warnings 'uninitialized';
@@ -4972,7 +4972,7 @@
     unlink $stderrname;
 
     my $pid = ::open3($stdin_fh,$stdout_fh,$stderr_fh,
-		      $0,qw(--plain --shell /bin/sh --will-cite), @args);
+		      $0,qw(--plain --shell @TERMUX_PREFIX@/bin/sh --will-cite), @args);
     if(my $writerpid = fork()) {
 	close $stdin_fh;
 	@stdout = <$stdout_fh>;
@@ -8632,7 +8632,9 @@
     #	  'threads' => #threads
     #	  'active' => #taskset_threads }
     # Use GNU/Linux
-    return sct_gnu_linux($_[0]);
+    #return sct_gnu_linux($_[0]);
+    # Use Hurd which uses nproc
+    return sct_hurd($_[0]);
 }
 
 sub sct_freebsd($) {