diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3039d154..35d5d650 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,7 +25,7 @@ option(MI_BUILD_OBJECT      "Build object library" ON)
 option(MI_BUILD_TESTS       "Build test executables" ON)
 option(MI_DEBUG_TSAN        "Build with thread sanitizer (needs clang)" OFF)
 option(MI_DEBUG_UBSAN       "Build with undefined-behavior sanitizer (needs clang++)" OFF)
-option(MI_SKIP_COLLECT_ON_EXIT, "Skip collecting memory on program exit" OFF)
+option(MI_SKIP_COLLECT_ON_EXIT "Skip collecting memory on program exit" OFF)
 option(MI_NO_PADDING        "Force no use of padding even in DEBUG mode etc." OFF)
 
 # deprecated options
@@ -262,6 +262,11 @@ if(MI_USE_CXX)
   endif()
 endif()
 
+if(CMAKE_SYSTEM_NAME MATCHES "Haiku")
+   SET(CMAKE_INSTALL_LIBDIR ~/config/non-packaged/lib)
+   SET(CMAKE_INSTALL_INCLUDEDIR ~/config/non-packaged/headers)
+ endif()
+
 # Compiler flags
 if(CMAKE_C_COMPILER_ID MATCHES "AppleClang|Clang|GNU")
   list(APPEND mi_cflags -Wall -Wextra -Wno-unknown-pragmas -fvisibility=hidden)
diff --git a/doc/mimalloc-doc.h b/doc/mimalloc-doc.h
index 38f7f7a8..815901f2 100644
--- a/doc/mimalloc-doc.h
+++ b/doc/mimalloc-doc.h
@@ -927,7 +927,7 @@ template<class T> struct mi_stl_allocator { }
 
 /*! \page build Building
 
-Checkout the sources from Github:
+Checkout the sources from GitHub:
 ```
 git clone https://github.com/microsoft/mimalloc
 ```
diff --git a/docs/build.html b/docs/build.html
index eac5392b..41e0199f 100644
--- a/docs/build.html
+++ b/docs/build.html
@@ -98,7 +98,7 @@ $(document).ready(function(){initNavTree('build.html',''); initResizable(); });
 <div class="title">Building </div>  </div>
 </div><!--header-->
 <div class="contents">
-<div class="textblock"><p>Checkout the sources from Github: </p><div class="fragment"><div class="line">git clone https:<span class="comment">//github.com/microsoft/mimalloc</span></div>
+<div class="textblock"><p>Checkout the sources from GitHub: </p><div class="fragment"><div class="line">git clone https://github.com/microsoft/mimalloc</div>
 </div><!-- fragment --><h2>Windows</h2>
 <p>Open <code>ide/vs2019/mimalloc.sln</code> in Visual Studio 2019 and build (or <code>ide/vs2017/mimalloc.sln</code>). The <code>mimalloc</code> project builds a static library (in <code>out/msvc-x64</code>), while the <code>mimalloc-override</code> project builds a DLL for overriding malloc in the entire program.</p>
 <h2>macOS, Linux, BSD, etc.</h2>
diff --git a/src/heap.c b/src/heap.c
index f74df731..7103281f 100644
--- a/src/heap.c
+++ b/src/heap.c
@@ -246,9 +246,6 @@ static void mi_heap_reset_pages(mi_heap_t* heap) {
   mi_assert_internal(mi_heap_is_initialized(heap));
   // TODO: copy full empty heap instead?
   memset(&heap->pages_free_direct, 0, sizeof(heap->pages_free_direct));
-#ifdef MI_MEDIUM_DIRECT
-  memset(&heap->pages_free_medium, 0, sizeof(heap->pages_free_medium));
-#endif
   _mi_memcpy_aligned(&heap->pages, &_mi_heap_empty.pages, sizeof(heap->pages));
   heap->thread_delayed_free = NULL;
   heap->page_count = 0;
diff --git a/src/init.c b/src/init.c
index 2db21d3f..51d42acd 100644
--- a/src/init.c
+++ b/src/init.c
@@ -536,7 +536,7 @@ static void mi_detect_cpu_features(void) {
   // FSRM for fast rep movsb support (AMD Zen3+ (~2020) or Intel Ice Lake+ (~2017))
   int32_t cpu_info[4];
   __cpuid(cpu_info, 7);
-  _mi_cpu_has_fsrm = ((cpu_info[3] & (1 << 4)) != 0); // bit 4 of EDX : see <https ://en.wikipedia.org/wiki/CPUID#EAX=7,_ECX=0:_Extended_Features>
+  _mi_cpu_has_fsrm = ((cpu_info[3] & (1 << 4)) != 0); // bit 4 of EDX : see <https://en.wikipedia.org/wiki/CPUID#EAX=7,_ECX=0:_Extended_Features>
 }
 #else
 static void mi_detect_cpu_features(void) {
diff --git a/src/prim/unix/prim.c b/src/prim/unix/prim.c
index 189631f0..077bf820 100644
--- a/src/prim/unix/prim.c
+++ b/src/prim/unix/prim.c
@@ -50,7 +50,7 @@ terms of the MIT license. A copy of the license can be found in the file
   #include <sys/sysctl.h>
 #endif
 
-#if !defined(__HAIKU__) && !defined(__APPLE__)
+#if !defined(__HAIKU__) && !defined(__APPLE__) && !defined(__CYGWIN__)
   #define MI_HAS_SYSCALL_H
   #include <sys/syscall.h>
 #endif
@@ -166,7 +166,6 @@ static void* unix_mmap_prim(void* addr, size_t size, size_t try_alignment, int p
   if (addr == NULL && try_alignment > 1 && (try_alignment % _mi_os_page_size()) == 0) {
     size_t n = mi_bsr(try_alignment);
     if (((size_t)1 << n) == try_alignment && n >= 12 && n <= 30) {  // alignment is a power of 2 and 4096 <= alignment <= 1GiB
-      flags |= MAP_ALIGNED(n);
       p = mmap(addr, size, protect_flags, flags | MAP_ALIGNED(n), fd, 0);
       if (p==MAP_FAILED || !_mi_is_aligned(p,try_alignment)) { 
         int err = errno;
@@ -410,7 +409,7 @@ int _mi_prim_protect(void* start, size_t size, bool protect) {
 // Huge page allocation
 //---------------------------------------------
 
-#if (MI_INTPTR_SIZE >= 8) && !defined(__HAIKU__)
+#if (MI_INTPTR_SIZE >= 8) && !defined(__HAIKU__) && !defined(__CYGWIN__)
 
 #ifndef MPOL_PREFERRED
 #define MPOL_PREFERRED 1
@@ -652,7 +651,7 @@ void _mi_prim_out_stderr( const char* msg ) {
 //----------------------------------------------------------------
 
 #if !defined(MI_USE_ENVIRON) || (MI_USE_ENVIRON!=0)
-// On Posix systemsr use `environ` to acces environment variables
+// On Posix systemsr use `environ` to access environment variables
 // even before the C runtime is initialized.
 #if defined(__APPLE__) && defined(__has_include) && __has_include(<crt_externs.h>)
 #include <crt_externs.h>
@@ -759,7 +758,7 @@ bool _mi_prim_random_buf(void* buf, size_t buf_len) {
       ssize_t ret = syscall(SYS_getrandom, buf, buf_len, GRND_NONBLOCK);
       if (ret >= 0) return (buf_len == (size_t)ret);
       if (errno != ENOSYS) return false;
-      mi_atomic_store_release(&no_getrandom, 1UL); // don't call again, and fall back to /dev/urandom
+      mi_atomic_store_release(&no_getrandom, (uintptr_t)1); // don't call again, and fall back to /dev/urandom
     }
   #endif
   int flags = O_RDONLY;
diff --git a/src/segment.c b/src/segment.c
index dc25dbda..3e56d50f 100644
--- a/src/segment.c
+++ b/src/segment.c
@@ -1070,7 +1070,7 @@ We maintain a global list of abandoned segments that are
 reclaimed on demand. Since this is shared among threads
 the implementation needs to avoid the A-B-A problem on
 popping abandoned segments: <https://en.wikipedia.org/wiki/ABA_problem>
-We use tagged pointers to avoid accidentially identifying
+We use tagged pointers to avoid accidentally identifying
 reused segments, much like stamped references in Java.
 Secondly, we maintain a reader counter to avoid resetting
 or decommitting segments that have a pending read operation.
diff --git a/test/main-override.cpp b/test/main-override.cpp
index d2814b68..c1607b66 100644
--- a/test/main-override.cpp
+++ b/test/main-override.cpp
@@ -105,6 +105,10 @@ static void various_tests() {
   delete t;
   t = new (std::nothrow) Test(42);
   delete t;
+  auto tbuf = new unsigned char[sizeof(Test)];
+  t = new (tbuf) Test(42);
+  t->~Test();
+  delete tbuf;
 }
 
 class Static {
diff --git a/test/test-stress.c b/test/test-stress.c
index 69650556..f4cb78b4 100644
--- a/test/test-stress.c
+++ b/test/test-stress.c
@@ -7,7 +7,7 @@ terms of the MIT license.
 /* This is a stress test for the allocator, using multiple threads and
    transferring objects between threads. It tries to reflect real-world workloads:
    - allocation size is distributed linearly in powers of two
-   - with some fraction extra large (and some extra extra large)
+   - with some fraction extra large (and some very large)
    - the allocations are initialized and read again at free
    - pointers transfer between threads
    - threads are terminated and recreated with some objects surviving in between