diff --git a/third-party/11zip/extlibs/minizip/include/minizip/gzguts.h b/third-party/11zip/extlibs/minizip/include/minizip/gzguts.h
index b838c41298..37351aefa7 100644
--- a/third-party/11zip/extlibs/minizip/include/minizip/gzguts.h
+++ b/third-party/11zip/extlibs/minizip/include/minizip/gzguts.h
@@ -166,6 +166,10 @@ ZEXTERN z_off64_t ZEXPORT gzoffset64 OF((gzFile));
 #define COPY 1      /* copy input directly */
 #define GZIP 2      /* decompress a gzip stream */
 
+#ifdef __unix__
+#include <unistd.h>
+#endif
+
 /* internal gzip file state data structure */
 typedef struct
 {
diff --git a/third-party/11zip/extlibs/minizip/src/miniunz.c b/third-party/11zip/extlibs/minizip/src/miniunz.c
index d60712b74d..a2c01dcd9c 100644
--- a/third-party/11zip/extlibs/minizip/src/miniunz.c
+++ b/third-party/11zip/extlibs/minizip/src/miniunz.c
@@ -52,6 +52,7 @@
 #else
 # include <unistd.h>
 # include <utime.h>
+#include <sys/stat.h>
 #endif
 
 
@@ -99,7 +100,7 @@ tm_unz tmu_date;
     SetFileTime(hFile, &ftm, &ftLastAcc, &ftm);
     CloseHandle(hFile);
 #else
-#ifdef unix || __APPLE__
+#if defined unix || defined __APPLE__
   struct utimbuf ut;
   struct tm newdate;
   newdate.tm_sec = tmu_date.tm_sec;
diff --git a/third-party/11zip/extlibs/minizip/src/minizip.c b/third-party/11zip/extlibs/minizip/src/minizip.c
index aad8fd85d4..704c53722b 100644
--- a/third-party/11zip/extlibs/minizip/src/minizip.c
+++ b/third-party/11zip/extlibs/minizip/src/minizip.c
@@ -92,7 +92,7 @@ uLong* dt; /* dostime */
     return ret;
 }
 #else
-#ifdef unix || __APPLE__
+#if defined unix || defined __APPLE__
 uLong filetime(f, tmzip, dt)
     char *f;               /* name of file to get info on */
     tm_zip *tmzip;         /* return value: access, modific. and creation times */
diff --git a/third-party/11zip/src/zipper.cpp b/third-party/11zip/src/zipper.cpp
index f55bf89578..ffdb645358 100644
--- a/third-party/11zip/src/zipper.cpp
+++ b/third-party/11zip/src/zipper.cpp
@@ -2,6 +2,7 @@
 #include <algorithm>
 #include <sstream>
 #include <ctime>
+#include <cstring>
 
 #include <minizip/zlib.h>
 
@@ -74,7 +75,8 @@ namespace ziputils
             }
 
             //?? we dont need the stinking time
-            zip_fileinfo zi = {0};
+            zip_fileinfo zi;
+            memset(&zi, 0, sizeof(zi));
             getTime(zi.tmz_date);
 
             int err = zipOpenNewFileInZip(zipFile_, filename, &zi,
@@ -109,7 +111,6 @@ namespace ziputils
     {
         int err = ZIP_OK;
         char buf[BUFSIZE];
-        unsigned long nRead = 0;
 
         if (isOpenEntry())
         {