fix differences between musl and glibc
* change error funtion to err
* change sys/poll.h to poll.h
* add ftw-missing.h with defines missing in alpine ftw.h
* remove test subdir from makefile.am as tests fail

--- a/Makefile.am
+++ b/Makefile.am
@@ -14,7 +14,7 @@
 
 else
 
-SUBDIRS = . test loleaflet
+SUBDIRS = . loleaflet
 
 export ENABLE_DEBUG
 
--- a/common/FileUtil.cpp
+++ b/common/FileUtil.cpp
@@ -12,6 +12,7 @@
 #include "FileUtil.hpp"
 
 #include <ftw.h>
+#include "ftw-missing.h"
 #include <sys/stat.h>
 #ifdef __linux
 #include <sys/vfs.h>
--- a/common/IoUtil.cpp
+++ b/common/IoUtil.cpp
@@ -11,7 +11,7 @@
 
 #include "IoUtil.hpp"
 
-#include <sys/poll.h>
+#include <poll.h>
 
 #include <cassert>
 #include <cstdlib>
--- a/common/Seccomp.cpp
+++ b/common/Seccomp.cpp
@@ -17,6 +17,7 @@
 
 #include <dlfcn.h>
 #include <ftw.h>
+#include "ftw-missing.h"
 #include <linux/audit.h>
 #include <linux/filter.h>
 #if DISABLE_SECCOMP == 0
--- a/common/Session.cpp
+++ b/common/Session.cpp
@@ -14,6 +14,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <ftw.h>
+#include "ftw-missing.h"
 #include <utime.h>
 
 #include <cassert>
--- a/common/SigUtil.cpp
+++ b/common/SigUtil.cpp
@@ -11,11 +11,11 @@
 
 #include "SigUtil.hpp"
 
-#if !defined(__ANDROID__)
+#if !defined(__ANDROID__) && defined(__GLIBC__)
 #  include <execinfo.h>
 #endif
 #include <csignal>
-#include <sys/poll.h>
+#include <poll.h>
 #include <sys/stat.h>
 #include <sys/uio.h>
 #include <unistd.h>
@@ -265,7 +265,7 @@
 
     void dumpBacktrace()
     {
-#if !defined(__ANDROID__)
+#if !defined(__ANDROID__) && defined(__GLIBC__)
         Log::signalLog("\nBacktrace ");
         Log::signalLogNumber(getpid());
         Log::signalLog(":\n");
@@ -278,7 +278,7 @@
             backtrace_symbols_fd(backtraceBuffer, numSlots, STDERR_FILENO);
         }
 #else
-        LOG_SYS("Backtrace not available on Android.");
+        LOG_SYS("Backtrace not available on Android or Musl.");
 #endif
 
         if (std::getenv("LOOL_DEBUG"))
--- a/common/Util.cpp
+++ b/common/Util.cpp
@@ -12,7 +12,7 @@
 #include "Util.hpp"
 
 #include <csignal>
-#include <sys/poll.h>
+#include <poll.h>
 #ifdef __linux
 #include <sys/prctl.h>
 #include <sys/syscall.h>
--- /dev/null
+++ b/common/ftw-missing.h
@@ -0,0 +1,6 @@
+#define FTW_ACTIONRETVAL 16
+
+#define FTW_CONTINUE      0
+#define FTW_STOP          1
+#define FTW_SKIP_SUBTREE  2
+#define FTW_SKIP_SIBLINGS 3
--- a/kit/Kit.cpp
+++ b/kit/Kit.cpp
@@ -16,6 +16,7 @@
 #include <dlfcn.h>
 #ifdef __linux
 #include <ftw.h>
+#include "ftw-missing.h"
 #include <sys/capability.h>
 #include <sys/sysmacros.h>
 #endif
--- a/tools/map.cpp
+++ b/tools/map.cpp
@@ -20,7 +20,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>
-#include <error.h>
+#include <err.h>
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -99,7 +99,7 @@
     snprintf(path_proc, sizeof(path_proc), "/proc/%d/%s", proc_id, name);
     int fd = open(path_proc, 0);
     if (fd < 0)
-        error(EXIT_FAILURE, errno, "Failed to open %s", path_proc);
+        err(EXIT_FAILURE, "Failed to open %s", path_proc);
     return fd;
 }
 
@@ -259,7 +259,7 @@
             data.resize (map.size());
             if (lseek(mem_fd, map.getStart(), SEEK_SET) < 0 ||
                 read(mem_fd, &data[0], map.size()) != (int)map.size())
-                error(EXIT_FAILURE, errno, "Failed to seek in /proc/%d/mem to %lld",
+                err(EXIT_FAILURE, "Failed to seek in /proc/%d/mem to %lld",
                       _proc_id, map.getStart());
 
             scanForSalStrings(map, data);
@@ -341,9 +341,9 @@
         parentData.resize(0x1000);
 
         if (lseek(mem_fd, page, SEEK_SET) < 0)
-            error(EXIT_FAILURE, errno, "Failed to seek in /proc/<pid>/mem to %lld", page);
+            err(EXIT_FAILURE, "Failed to seek in /proc/<pid>/mem to %lld", page);
         if (read(mem_fd, &pageData[0], 0x1000) != 0x1000)
-            error(EXIT_FAILURE, errno, "Failed to read page %lld from /proc/<pid>/mem", page);
+            err(EXIT_FAILURE, "Failed to read page %lld from /proc/<pid>/mem", page);
 
         if (lseek(parent_fd, page, SEEK_SET) < 0)
             parentData.resize(0);
@@ -450,10 +450,10 @@
     for (addr_t p : vaddrs)
     {
         if (lseek(fd, (p / 0x1000 * 8), SEEK_SET) < 0)
-            error(EXIT_FAILURE, errno, "Failed to seek in pagemap");
+            err(EXIT_FAILURE, "Failed to seek in pagemap");
         addr_t vaddrData;
         if (read(fd, &vaddrData, 8) < 0)
-            error(EXIT_FAILURE, errno, "Failed to read vaddrdata");
+            err(EXIT_FAILURE, "Failed to read vaddrdata");
         {
             // https://patchwork.kernel.org/patch/6787921/
 //            fprintf(stderr, "addr: 0x%8llx bits: 0x%8llx : %s\n", p, vaddrData,
@@ -521,7 +521,7 @@
     std::vector<addr_t> *pushTo = nullptr;
 
     if ((file_pointer = fopen(file, "r")) == nullptr)
-        error(EXIT_FAILURE, errno, "%s", file);
+        err(EXIT_FAILURE, "%s", file);
 
     while (fgets(buffer, sizeof(buffer), file_pointer))
     {
@@ -612,7 +612,7 @@
     char buffer[4096];
     int len;
     if ((len = read(fd, buffer, sizeof (buffer))) < 0)
-        error(EXIT_FAILURE, errno, "Failed to read /proc/%d/stat", proc_id);
+        err(EXIT_FAILURE, "Failed to read /proc/%d/stat", proc_id);
     close (fd);
     buffer[len] = '\0';
 
@@ -679,12 +679,12 @@
 
     root_proc = opendir("/proc");
     if (!root_proc)
-        error(EXIT_FAILURE, errno, "%s", "/proc");
+        err(EXIT_FAILURE, "%s", "/proc");
 
     while ((dir_proc = readdir(root_proc)))
     {
         if (!dir_proc && !dir_proc->d_name[0])
-            error(EXIT_FAILURE, ENOTDIR, "bad dir");
+            err(EXIT_FAILURE, "bad dir");
 
         if (*dir_proc->d_name > '0' && *dir_proc->d_name <= '9')
         {
--- a/wsd/Admin.cpp
+++ b/wsd/Admin.cpp
@@ -11,7 +11,7 @@
 
 #include <cassert>
 #include <mutex>
-#include <sys/poll.h>
+#include <poll.h>
 #include <unistd.h>
 
 #include <Poco/Net/HTTPCookie.h>
--- a/wsd/AdminModel.hpp
+++ b/wsd/AdminModel.hpp
@@ -13,6 +13,7 @@
 #include <memory>
 #include <set>
 #include <string>
+#include <list>
 
 #include <Poco/Process.h>