diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0a21b87..6837b25 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,6 +25,10 @@ configure_file(
 	"${PROJECT_BINARY_DIR}/config.h"
 	)
 
+macro(set_option option value)
+	set(${option} ${value} CACHE INTERNAL "" FORCE)
+endmacro()
+
 if (EXISTS "${PROJECT_SOURCE_DIR}/steamworks_c_wrapper/sdk")
 	MESSAGE ( STATUS "Steam SDK located, Steam build enabled")
 	set(STEAM 1)
@@ -105,6 +109,8 @@ if (NOT LUA_FOUND OR STEAM)
 endif ()
 
 if (NOT PHYSFS_FOUND OR STEAM)
+	set_option(PHYSFS_BUILD_SHARED off)
+	set_option(PHYSFS_BUILD_TEST off)
 	add_subdirectory(physfs-3.0)
 	include_directories(physfs-3.0/src)
 	set(PHYSFS_LIBRARY physfs-static)
diff --git a/physfs-3.0/.hg_archival.txt b/physfs-3.0/.hg_archival.txt
deleted file mode 100644
index f119afa..0000000
--- a/physfs-3.0/.hg_archival.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-repo: 7672c9962ce627edaaa67ff54fe4ad8f9a46dc2b
-node: fa8e38bcc3545000a38704b65b604a2c1b764d10
-branch: stable-3.0
-tag: release-3.0.1
diff --git a/physfs-3.0/.hgignore b/physfs-3.0/.hgignore
deleted file mode 100644
index d015a85..0000000
--- a/physfs-3.0/.hgignore
+++ /dev/null
@@ -1,2 +0,0 @@
-syntax:glob
-cmake-build
diff --git a/physfs-3.0/.hgtags b/physfs-3.0/.hgtags
deleted file mode 100644
index e0b54b1..0000000
--- a/physfs-3.0/.hgtags
+++ /dev/null
@@ -1,15 +0,0 @@
-0bb92a5f0fffd2452cc737346e8b796c213a5688 release-0.1.1
-2f2afcbd8abd784f738ac45b0368044763d63748 release-0.1.0
-3c7cf50a58fbf220154acd4bdfdf00a21f259eb7 release-0.1.8
-473b50402f55b2340fc286775d1b78d18a810362 release-0.1.3
-60b5f566a2585d78b2ffadd8d9c16299d0340820 release-1.0.0
-67aff4091bf129f7167ed87f937b15f31093e19e release-0.1.9
-6ad1722bbcaec1265cb74c9b7be13fe02a547d37 release-0.1.7
-8f3ccaaea1cd5dc19235882494d6102e5e9176fb release-0.1.2
-c966316c89981bea6ccaa2c2909bb303bfeeb82b release-0.1.6
-d2f04ab4b4127757234af6b30bfc98ad4ee9cb15 release-0.1.4
-d94f1ccac8095509c57ad640d54796aea0d260f0 release-0.1.5
-fe0c1d6f40afa6fca09a277a1ade59231f16c66f release-1.1.1
-5d70fca3be361258edfb59c3edaba5abe75a1e88 release-2.0.0
-df04959950eb3830c39adfa983789f70f86062d7 release-1.1.0
-3396e6dd19fbb52a3fa7e171ffb38ed9acb285a4 release-2.1.1
diff --git a/physfs-3.0/CMakeLists.txt b/physfs-3.0/CMakeLists.txt
index eb377d2..9373a03 100644
--- a/physfs-3.0/CMakeLists.txt
+++ b/physfs-3.0/CMakeLists.txt
@@ -168,7 +168,7 @@ if(PHYSFS_BUILD_STATIC)
     set(PHYSFS_INSTALL_TARGETS ${PHYSFS_INSTALL_TARGETS} ";physfs-static")
 endif()
 
-option(PHYSFS_BUILD_SHARED "Build shared library" FALSE)
+option(PHYSFS_BUILD_SHARED "Build shared library" TRUE)
 if(PHYSFS_BUILD_SHARED)
     add_library(physfs SHARED ${PHYSFS_SRCS})
     set_target_properties(physfs PROPERTIES MACOSX_RPATH 1)
@@ -192,7 +192,7 @@ if(PHYSFS_BUILD_SHARED AND PHYSFS_BUILD_STATIC AND NOT WINDOWS)
     set_target_properties(physfs-static PROPERTIES CLEAN_DIRECT_OUTPUT 1)
 endif()
 
-option(PHYSFS_BUILD_TEST "Build stdio test program." FALSE)
+option(PHYSFS_BUILD_TEST "Build stdio test program." TRUE)
 mark_as_advanced(PHYSFS_BUILD_TEST)
 if(PHYSFS_BUILD_TEST)
     find_path(READLINE_H readline/readline.h)
diff --git a/physfs-3.0/LICENSE.txt b/physfs-3.0/LICENSE.txt
index 90018f2..a3de2bb 100644
--- a/physfs-3.0/LICENSE.txt
+++ b/physfs-3.0/LICENSE.txt
@@ -1,5 +1,5 @@
 
-   Copyright (c) 2001-2017 Ryan C. Gordon and others.
+   Copyright (c) 2001-2018 Ryan C. Gordon and others.
 
    This software is provided 'as-is', without any express or implied warranty.
    In no event will the authors be held liable for any damages arising from
diff --git a/physfs-3.0/docs/CREDITS.txt b/physfs-3.0/docs/CREDITS.txt
index f7da37f..c88c50b 100644
--- a/physfs-3.0/docs/CREDITS.txt
+++ b/physfs-3.0/docs/CREDITS.txt
@@ -164,6 +164,9 @@ CMake fixes:
 Bug fixes,
     Rémi Verschelde
 
+Bug fixes:
+    Rob Loach
+
 Other stuff:
     Your name here! Patches go to icculus@icculus.org ...
 
diff --git a/physfs-3.0/extras/ignorecase.c b/physfs-3.0/extras/ignorecase.c
index 3a58f1b..869c213 100644
--- a/physfs-3.0/extras/ignorecase.c
+++ b/physfs-3.0/extras/ignorecase.c
@@ -50,18 +50,22 @@ static int locateOneElement(char *buf)
         ptr++;  /* point past dirsep to entry itself. */
     } /* else */
 
-    for (i = rc; *i != NULL; i++)
+    if (rc != NULL)
     {
-        if (PHYSFS_utf8stricmp(*i, ptr) == 0)
+        for (i = rc; *i != NULL; i++)
         {
-            strcpy(ptr, *i); /* found a match. Overwrite with this case. */
-            PHYSFS_freeList(rc);
-            return 1;
-        } /* if */
-    } /* for */
+            if (PHYSFS_utf8stricmp(*i, ptr) == 0)
+            {
+                strcpy(ptr, *i); /* found a match. Overwrite with this case. */
+                PHYSFS_freeList(rc);
+                return 1;
+            } /* if */
+        } /* for */
+
+        PHYSFS_freeList(rc);
+    } /* if */
 
     /* no match at all... */
-    PHYSFS_freeList(rc);
     return 0;
 } /* locateOneElement */
 
diff --git a/physfs-3.0/extras/physfsrwops.c b/physfs-3.0/extras/physfsrwops.c
index 8e5857c..a8654ab 100644
--- a/physfs-3.0/extras/physfsrwops.c
+++ b/physfs-3.0/extras/physfsrwops.c
@@ -32,10 +32,16 @@
 #endif
 
 #if !TARGET_SDL2
+#ifndef RW_SEEK_SET
 #define RW_SEEK_SET SEEK_SET
+#endif
+#ifndef RW_SEEK_CUR
 #define RW_SEEK_CUR SEEK_CUR
+#endif
+#ifndef RW_SEEK_END
 #define RW_SEEK_END SEEK_END
 #endif
+#endif
 
 #if TARGET_SDL2
 static Sint64 SDLCALL physfsrwops_size(struct SDL_RWops *rw)
diff --git a/physfs-3.0/src/physfs.c b/physfs-3.0/src/physfs.c
index 19148ad..d0d5444 100644
--- a/physfs-3.0/src/physfs.c
+++ b/physfs-3.0/src/physfs.c
@@ -879,13 +879,20 @@ static DirHandle *openDirectory(PHYSFS_Io *io, const char *d, int forWriting)
 
     if (io == NULL)
     {
+        /* file doesn't exist, etc? Just fail out. */
+        PHYSFS_Stat statbuf;
+        BAIL_IF_ERRPASS(!__PHYSFS_platformStat(d, &statbuf, 1), NULL);
+
         /* DIR gets first shot (unlike the rest, it doesn't deal with files). */
-        retval = tryOpenDir(io, &__PHYSFS_Archiver_DIR, d, forWriting, &claimed);
-        if (retval || claimed)
-            return retval;
+        if (statbuf.filetype == PHYSFS_FILETYPE_DIRECTORY)
+        {
+            retval = tryOpenDir(io, &__PHYSFS_Archiver_DIR, d, forWriting, &claimed);
+            if (retval || claimed)
+                return retval;
+        } /* if */
 
         io = __PHYSFS_createNativeIo(d, forWriting ? 'w' : 'r');
-        BAIL_IF_ERRPASS(!io, 0);
+        BAIL_IF_ERRPASS(!io, NULL);
         created_io = 1;
     } /* if */
 
@@ -2662,7 +2669,6 @@ static int closeHandleInOpenList(FileHandle **list, FileHandle *handle)
 {
     FileHandle *prev = NULL;
     FileHandle *i;
-    int rc = 1;
 
     for (i = *list; i != NULL; i = i->next)
     {
@@ -2670,9 +2676,16 @@ static int closeHandleInOpenList(FileHandle **list, FileHandle *handle)
         {
             PHYSFS_Io *io = handle->io;
             PHYSFS_uint8 *tmp = handle->buffer;
-            rc = PHYSFS_flush((PHYSFS_File *) handle);
-            if (!rc)
+
+            /* send our buffer to io... */
+            if (!PHYSFS_flush((PHYSFS_File *) handle))
                 return -1;
+
+            /* ...then have io send it to the disk... */
+            else if (io->flush && !io->flush(io))
+                return -1;
+
+            /* ...then close the underlying file. */
             io->destroy(io);
 
             if (tmp != NULL)  /* free any associated buffer. */
@@ -2970,7 +2983,7 @@ int PHYSFS_flush(PHYSFS_File *handle)
     rc = io->write(io, fh->buffer + fh->bufpos, fh->buffill - fh->bufpos);
     BAIL_IF_ERRPASS(rc <= 0, 0);
     fh->bufpos = fh->buffill = 0;
-    return io->flush ? io->flush(io) : 1;
+    return 1;
 } /* PHYSFS_flush */
 
 
diff --git a/physfs-3.0/src/physfs.h b/physfs-3.0/src/physfs.h
index 9169607..d18cbb9 100644
--- a/physfs-3.0/src/physfs.h
+++ b/physfs-3.0/src/physfs.h
@@ -225,11 +225,11 @@ extern "C" {
 
 #if defined(PHYSFS_DECL)
 /* do nothing. */
-#elif (defined _MSC_VER)
+#elif defined(_MSC_VER)
 #define PHYSFS_DECL __declspec(dllexport)
-#elif (defined __SUNPRO_C)
+#elif defined(__SUNPRO_C)
 #define PHYSFS_DECL __global
-#elif ((__GNUC__ >= 3) && (!__EMX__) && (!sun))
+#elif ((__GNUC__ >= 3) && (!defined(__EMX__)) && (!defined(sun)))
 #define PHYSFS_DECL __attribute__((visibility("default")))
 #else
 #define PHYSFS_DECL
diff --git a/physfs-3.0/src/physfs_archiver_7z.c b/physfs-3.0/src/physfs_archiver_7z.c
index f35a0b1..914f691 100644
--- a/physfs-3.0/src/physfs_archiver_7z.c
+++ b/physfs-3.0/src/physfs_archiver_7z.c
@@ -203,6 +203,8 @@ static void SZIP_closeArchive(void *opaque)
     SZIPinfo *info = (SZIPinfo *) opaque;
     if (info)
     {
+        if (info->io)
+            info->io->destroy(info->io);
         SzArEx_Free(&info->db, &SZIP_SzAlloc);
         __PHYSFS_DirTreeDeinit(&info->tree);
         allocator.Free(info);
diff --git a/physfs-3.0/src/physfs_platform_apple.m b/physfs-3.0/src/physfs_platform_apple.m
index fe50f4b..e6207f5 100644
--- a/physfs-3.0/src/physfs_platform_apple.m
+++ b/physfs-3.0/src/physfs_platform_apple.m
@@ -50,7 +50,7 @@ char *__PHYSFS_platformCalcPrefDir(const char *org, const char *app)
     {
         NSArray *paths = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, TRUE);
         BAIL_IF(!paths, PHYSFS_ERR_OS_ERROR, NULL);
-        NSString *path = (NSString *) paths[0];
+        NSString *path = (NSString *) [paths objectAtIndex:0];
         BAIL_IF(!path, PHYSFS_ERR_OS_ERROR, NULL);
         size_t len = [path lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
         const size_t applen = strlen(app);
diff --git a/physfs-3.0/src/physfs_platform_windows.c b/physfs-3.0/src/physfs_platform_windows.c
index e777235..7235f2a 100644
--- a/physfs-3.0/src/physfs_platform_windows.c
+++ b/physfs-3.0/src/physfs_platform_windows.c
@@ -566,7 +566,6 @@ char *__PHYSFS_platformCalcUserDir(void)
     else
     {
         DWORD psize = 0;
-        WCHAR dummy = 0;
         LPWSTR wstr = NULL;
         BOOL rc = 0;
 
@@ -575,7 +574,7 @@ char *__PHYSFS_platformCalcUserDir(void)
          *  psize. Also note that the second parameter can't be
          *  NULL or the function fails.
          */
-        rc = pGetDir(accessToken, &dummy, &psize);
+        rc = pGetDir(accessToken, NULL, &psize);
         GOTO_IF(rc, PHYSFS_ERR_OS_ERROR, done);  /* should have failed! */
 
         /* Allocate memory for the profile directory */