diff -uNr boinc-client_release-7.18-7.18.1/client/app_start.cpp boinc-client_release-7.18-7.18.1.mod/client/app_start.cpp
--- boinc-client_release-7.18-7.18.1/client/app_start.cpp	2021-08-03 23:52:19.000000000 +0800
+++ boinc-client_release-7.18-7.18.1.mod/client/app_start.cpp	2021-12-29 19:46:22.481460428 +0800
@@ -81,6 +81,10 @@
 
 #include "app.h"
 
+#ifdef __ANDROID__
+#include <stdlib.h> // getenv(), setenv(), unsetenv()
+char helper_path[] = "@TERMUX_PREFIX@/bin/proot";
+#endif
 
 #ifdef _WIN32
 // Dynamically link to these functions at runtime;
@@ -1129,6 +1133,49 @@
             //
             umask(2);
             retval = execv(switcher_path, argv);
+#ifdef __ANDROID__
+#if defined(__aarch64__) || defined(__arm__)
+        } else if (strstr(exec_name, "unknown-linux-gnu")) {
+#elif defined(__x86_64__) || defined(__i386__)
+        } else if (strstr(exec_name, "pc-linux-gnu")) {
+#endif
+            // experimental GNU/Linux tasks support via proot
+            argv[0] = helper_path;
+            argv[1] = buf;
+            parse_command_line(cmdline, argv+2);
+            // unsure this debug copied from above works or not
+            if (log_flags.task_debug) {
+                debug_print_argv(argv);
+            }
+            // backup and unset LD_PRELOAD var for proot
+            char *old_env = getenv("LD_PRELOAD");
+            unsetenv("LD_PRELOAD");
+            // helper_path must be valid and exists to work
+            retval = execv(helper_path, argv);
+            // set LD_PRELOAD var back
+            setenv("LD_PRELOAD", old_env, 1);
+            free(old_env);
+#if defined(__aarch64__)
+        } else if (strstr(exec_name, "arm-android-linux-gnu")) {
+#elif defined(__x86_64__)
+        } else if (strstr(exec_name, "x86-android-linux-gnu")) {
+#endif
+#if defined(__aarch64__) || defined(__x86_64__)
+            // fix Termux 32bit compatibility on 64bit devices
+            // should be no longer required as its fixed on
+            // termux-exec side, kept for references
+            // https://github.com/termux/termux-exec/pull/17
+            argv[0] = buf;
+            parse_command_line(cmdline, argv+1);
+            // backup and unset LD_PRELOAD var
+            char *old_env = getenv("LD_PRELOAD");
+            unsetenv("LD_PRELOAD");
+            retval = execv(buf, argv);
+            // set LD_PRELOAD var back
+            setenv("LD_PRELOAD", old_env, 1);
+            free(old_env);
+#endif
+#endif // __ANDROID__
         } else {
             argv[0] = buf;
             parse_command_line(cmdline, argv+1);
@@ -1151,6 +1198,17 @@
         );
     }
 
+#ifdef __ANDROID__
+    // get debug info from client not from forked task
+#if defined(__aarch64__) || defined(__arm__)
+    if (strstr(exec_name, "unknown-linux-gnu")) {
+#elif defined(__x86_64__) || defined(__i386__)
+    if (strstr(exec_name, "pc-linux-gnu")) {
+#endif
+        msg_printf(NULL, MSG_INFO, "Helper: Running %s via %s\n", exec_name, helper_path);
+    }
+#endif // __ANDROID__
+
 #endif
     set_task_state(PROCESS_EXECUTING, "start");
     return 0;