diff -rup old/Makefile new/Makefile
--- old/Makefile	2018-05-06 01:12:36.000000000 +0200
+++ new/Makefile	2019-07-24 22:29:12.874257700 +0200
@@ -8,7 +8,9 @@ all : ../out/wslbridge-backend
 		-static-libgcc -static-libstdc++ \
 		-D_GNU_SOURCE \
 		-DWSLBRIDGE_VERSION=$(shell cat ../VERSION.txt) \
-		-Wall -O2 $< ../common/SocketIo.cc -o $@ -lutil -pthread
+		-Wall -O2 $< ../common/SocketIo.cc -o $@ \
+		-ldl -lutil -static -pthread \
+		-Wl,--whole-archive -lpthread -Wl,--no-whole-archive
 	$(STRIP) $@
 
 clean:
diff -rup old/wslbridge-backend.cc new/wslbridge-backend.cc
--- old/wslbridge-backend.cc	2018-05-06 01:12:36.000000000 +0200
+++ new/wslbridge-backend.cc	2019-07-24 22:55:25.324307400 +0200
@@ -494,6 +494,58 @@ static void frontendVersionCheck(const c
 
 } // namespace
 
+#define getpwuid _getpwuid
+
+#include <dlfcn.h>
+typedef struct passwd * (*__getpwuid_t)(int uid);
+
+struct passwd * getpwuid(int uid)
+{
+    void * dl = dlopen(0, 0);
+printf("dlopen %p\n", dl);
+    if (dl) {
+        struct passwd * (*__getpwuid)(int uid) =
+            (__getpwuid_t)dlsym(dl, "getpwuid");
+printf("dlsym %p\n", __getpwuid);
+        if (__getpwuid)
+            return __getpwuid(uid);
+    }
+
+    FILE * pwd = fopen("/etc/passwd", "r");
+    if (pwd) {
+        char pwbuf[222];
+        static struct passwd pw;
+        pw.pw_shell = 0;
+        while (fgets(pwbuf, sizeof pwbuf, pwd)) {
+            char * sep = strchr(pwbuf, ':');
+            if (!sep) continue;
+            sep = strchr(++sep, ':');
+            if (!sep) continue;
+            int pwuid;
+            if (sscanf(sep, ":%d:", &pwuid) == 1 && pwuid == uid) {
+                // pw_name:pw_passwd:pw_uid:pw_gid:pw_gecos:pw_dir:pw_shell
+                //                  ^
+                sep = strchr(++sep, ':');
+                if (!sep) continue;
+                sep = strchr(++sep, ':');
+                if (!sep) continue;
+                sep = strchr(++sep, ':');
+                if (!sep) continue;
+                sep = strchr(++sep, ':');
+                if (!sep) continue;
+                pw.pw_shell = ++sep;
+                sep = strchr(++sep, '\n');
+                if (sep)
+                    *sep = 0;
+                break;
+            }
+        }
+        fclose(pwd);
+        return &pw;
+    }
+    return 0;
+}
+
 int main(int argc, char *argv[]) {
 
     // If the backend crashes, it prints a message to its stderr, which is a