diff --git a/Make.inc b/Make.inc
index 003f50db78376..b8b04c9332313 100644
--- a/Make.inc
+++ b/Make.inc
@@ -340,6 +340,11 @@ endif
 
 STDLIBCPP_FLAG :=
 
+ifeq ($(OS), FreeBSD)
+USEGCC := 0
+USECLANG := 1
+endif
+
 ifeq ($(OS), Darwin)
 DARWINVER := $(shell uname -r | cut -b 1-2)
 DARWINVER_GTE13 := $(shell expr `uname -r | cut -b 1-2` \>= 13)
diff --git a/README.md b/README.md
index d893f1b32c036..bf89ab33271bf 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ developers may find the notes in [CONTRIBUTING](https://github.com/JuliaLang/jul
 - **FreeBSD**
 - **Windows**
 
-All systems are supported with both x86/64 (64-bit) and x86 (32-bit) architectures. Experimental and early support for [ARM](https://github.com/JuliaLang/julia/blob/master/README.arm.md) is available too.
+All systems are supported with both x86/64 (64-bit) and x86 (32-bit) architectures. Experimental and early support for [ARM](https://github.com/JuliaLang/julia/blob/master/README.arm.md), AARCH64, and POWER (little-endian) is available too.
 
 <a name="Source-Download-and-Compilation"/>
 ## Source Download and Compilation
@@ -235,12 +235,22 @@ When building Julia, or its dependencies, libraries installed by third party pac
 
 ### FreeBSD
 
-On *FreeBSD Release 9.0*, install the `gcc47`, `git`, and `gmake` packages/ports, and compile Julia with the command:
+On *FreeBSD Release 11.0*, install the gfortran, git, cmake, and gmake packages/ports (`pkg install gcc6 gmake git cmake`), and compile Julia with the command:
 
-    $ gmake FC=gfortran47
+    $ echo 'FC=gfortran6' >> Make.user
+    $ gmake
 
 You must use the `gmake` command on FreeBSD instead of `make`.
 
+Note that Julia is community-supported and we have little control over our upstream dependencies, you may still run into issues with dependencies and YMMV. Current known issues include:
+
+ - The x86 arch doesn't support threading due to lack of compiler runtime library support (set `JULIA_THREADS=0`).
+ - libunwind needs a small patch to its tests to compile.
+ - OpenBLAS patches in pkg haven't been upstreamed.
+ - gfortran can't link binaries. Set `FFLAGS=-Wl,-rpath,/usr/local/lib/gcc6` to work around this (upstream bug submitted to FreeBSD pkg maintainers).
+ - System libraries installed by pkg are not on the compiler path by default. You may need to add `LDFLAGS=/usr/local/lib` and `CPPFLAGS=/usr/local/include` to your environment or `Make.user` file to build successfully.
+
+
 ### Windows
 
 In order to build Julia on Windows, see [README.windows](https://github.com/JuliaLang/julia/blob/master/README.windows.md).
diff --git a/deps/checksums/libuv-28743d6091531340cfe316de2b2d385fe1778ff5.tar.gz/md5 b/deps/checksums/libuv-28743d6091531340cfe316de2b2d385fe1778ff5.tar.gz/md5
deleted file mode 100644
index e42a20ffd5a35..0000000000000
--- a/deps/checksums/libuv-28743d6091531340cfe316de2b2d385fe1778ff5.tar.gz/md5
+++ /dev/null
@@ -1 +0,0 @@
-cc07a8ef026fa42eeaddf7b6e074096e
diff --git a/deps/checksums/libuv-28743d6091531340cfe316de2b2d385fe1778ff5.tar.gz/sha512 b/deps/checksums/libuv-28743d6091531340cfe316de2b2d385fe1778ff5.tar.gz/sha512
deleted file mode 100644
index bec2d8d44203f..0000000000000
--- a/deps/checksums/libuv-28743d6091531340cfe316de2b2d385fe1778ff5.tar.gz/sha512
+++ /dev/null
@@ -1 +0,0 @@
-e128cec9548ff2f52a78743203d3f06dceef3cf7cbeb3a7a5f7453b132576833f82688eed52cf74c035f57828deac079cd845ad47c8cd6197a8e0bebf3586fc2
diff --git a/deps/checksums/libuv-8d5131b6c1595920dd30644cd1435b4f344b46c8.tar.gz/md5 b/deps/checksums/libuv-8d5131b6c1595920dd30644cd1435b4f344b46c8.tar.gz/md5
new file mode 100644
index 0000000000000..89795f7987bbc
--- /dev/null
+++ b/deps/checksums/libuv-8d5131b6c1595920dd30644cd1435b4f344b46c8.tar.gz/md5
@@ -0,0 +1 @@
+4c91d4c9161555c911630b0a70ddec03
diff --git a/deps/checksums/libuv-8d5131b6c1595920dd30644cd1435b4f344b46c8.tar.gz/sha512 b/deps/checksums/libuv-8d5131b6c1595920dd30644cd1435b4f344b46c8.tar.gz/sha512
new file mode 100644
index 0000000000000..faf62292a62af
--- /dev/null
+++ b/deps/checksums/libuv-8d5131b6c1595920dd30644cd1435b4f344b46c8.tar.gz/sha512
@@ -0,0 +1 @@
+c53513a5aea84405bf302b084a23f24f54148aac90a2bd666219ce14879723baab959942934d0d801a4572fffd07e60a7d574ade8d7eb57b6da8216063c20a48
diff --git a/deps/libgit2.mk b/deps/libgit2.mk
index 0e530132f7732..f17bea8ff3345 100644
--- a/deps/libgit2.mk
+++ b/deps/libgit2.mk
@@ -47,9 +47,14 @@ ifeq ($(OS),Linux)
 $(BUILDDIR)/$(LIBGIT2_SRC_DIR)/Makefile: $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/libgit2-require-openssl.patch-applied $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/libgit2-openssl-hang.patch-applied
 endif
 ifneq ($(OS),WINNT)
+ifeq ($(USE_SYSTEM_CURL), 0)
 $(BUILDDIR)/$(LIBGIT2_SRC_DIR)/Makefile: $(CURL_OBJ_TARGET)
 endif
-$(BUILDDIR)/$(LIBGIT2_SRC_DIR)/Makefile: $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/CMakeLists.txt $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/libgit2-ssh.patch-applied $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/libgit2-agent-nonfatal.patch-applied $(LIBSSH2_OBJ_TARGET)
+endif
+ifeq ($(USE_SYSTEM_LIBSSH2), 0)
+$(BUILDDIR)/$(LIBGIT2_SRC_DIR)/Makefile: $(LIBSSH2_OBJ_TARGET)
+endif
+$(BUILDDIR)/$(LIBGIT2_SRC_DIR)/Makefile: $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/CMakeLists.txt $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/libgit2-ssh.patch-applied $(SRCDIR)/srccache/$(LIBGIT2_SRC_DIR)/libgit2-agent-nonfatal.patch-applied
 	mkdir -p $(dir $@)
 	cd $(dir $@) && \
 	$(CMAKE) $(dir $<) $(LIBGIT2_OPTS)
diff --git a/deps/libuv.version b/deps/libuv.version
index 478ebca66589a..4ba4b36712aaf 100644
--- a/deps/libuv.version
+++ b/deps/libuv.version
@@ -1,2 +1,2 @@
 LIBUV_BRANCH=julia-uv1.9.0
-LIBUV_SHA1=28743d6091531340cfe316de2b2d385fe1778ff5
+LIBUV_SHA1=8d5131b6c1595920dd30644cd1435b4f344b46c8
diff --git a/src/cgmemmgr.cpp b/src/cgmemmgr.cpp
index 5c3b187ecab25..a85dfa57a227b 100644
--- a/src/cgmemmgr.cpp
+++ b/src/cgmemmgr.cpp
@@ -47,7 +47,7 @@ static void *map_anon_page(size_t size)
     mem = (char*)LLT_ALIGN(uintptr_t(mem), jl_page_size);
 #else // _OS_WINDOWS_
     void *mem = mmap(nullptr, size, PROT_READ | PROT_WRITE,
-                     MAP_NORESERVE | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+                     MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     assert(mem != MAP_FAILED && "Cannot allocate RW memory");
 #endif // _OS_WINDOWS_
     return mem;
diff --git a/src/flisp/Makefile b/src/flisp/Makefile
index 5d7cf6fc51ccd..5de2aff8a4888 100644
--- a/src/flisp/Makefile
+++ b/src/flisp/Makefile
@@ -77,10 +77,10 @@ CCLD := $(LD)
 endif
 
 $(BUILDDIR)/$(EXENAME)-debug: $(DOBJS) $(LIBFILES_debug) $(BUILDDIR)/$(LIBTARGET)-debug.a $(BUILDDIR)/flmain.dbg.obj | $(BUILDDIR)/flisp.boot
-	@$(call PRINT_LINK, $(CCLD) $(DEBUGFLAGS) $(DOBJS) $(BUILDDIR)/flmain.dbg.obj -o $@ $(BUILDDIR)/$(LIBTARGET)-debug.a $(LIBFILES_debug) $(LIBS) $(OSLIBS))
+	@$(call PRINT_LINK, $(CCLD) $(DEBUGFLAGS) $(LDFLAGS) $(DOBJS) $(BUILDDIR)/flmain.dbg.obj -o $@ $(BUILDDIR)/$(LIBTARGET)-debug.a $(LIBFILES_debug) $(LIBS) $(OSLIBS))
 
 $(BUILDDIR)/$(EXENAME): $(OBJS) $(LIBFILES_release) $(BUILDDIR)/$(LIBTARGET).a $(BUILDDIR)/flmain.o | $(BUILDDIR)/flisp.boot
-	@$(call PRINT_LINK, $(CCLD) $(SHIPFLAGS) $(OBJS) $(BUILDDIR)/flmain.o -o $@ $(BUILDDIR)/$(LIBTARGET).a $(LIBFILES_release) $(LIBS) $(OSLIBS))
+	@$(call PRINT_LINK, $(CCLD) $(SHIPFLAGS) $(LDFLAGS) $(OBJS) $(BUILDDIR)/flmain.o -o $@ $(BUILDDIR)/$(LIBTARGET).a $(LIBFILES_release) $(LIBS) $(OSLIBS))
 
 ifneq ($(BUILDDIR),.)
 $(BUILDDIR)/flisp.boot: flisp.boot
diff --git a/src/gc-pages.c b/src/gc-pages.c
index ead16010cee15..fbe2b27450fe3 100644
--- a/src/gc-pages.c
+++ b/src/gc-pages.c
@@ -37,6 +37,10 @@ void jl_gc_init_page(void)
 #endif
 }
 
+#ifndef MAP_NORESERVE // not defined in POSIX, FreeBSD, etc.
+#define MAP_NORESERVE (0)
+#endif
+
 // Try to allocate a memory block for a region with `pg_cnt` pages.
 // Return `NULL` if allocation failed. Result is aligned to `GC_PAGE_SZ`.
 static char *jl_gc_try_alloc_region(int pg_cnt)
diff --git a/src/gc.c b/src/gc.c
index c95a9fbc62d59..44aa2d2133b91 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -618,7 +618,11 @@ JL_DLLEXPORT jl_value_t *jl_gc_big_alloc(jl_ptls_t ptls, size_t sz)
     bigval_t *v = (bigval_t*)malloc_cache_align(allocsz);
     if (v == NULL)
         jl_throw(jl_memory_exception);
+#ifdef JULIA_ENABLE_THREADING
     jl_atomic_fetch_add(&gc_num.allocd, allocsz);
+#else
+    gc_num.allocd += allocsz;
+#endif
     gc_num.bigalloc++;
 #ifdef MEMDEBUG
     memset(v, 0xee, allocsz);
@@ -1602,7 +1606,7 @@ static void post_mark(arraylist_t *list)
 }
 
 // collector entry point and control
-static volatile uint64_t jl_gc_disable_counter = 0;
+static volatile uint32_t jl_gc_disable_counter = 0;
 
 JL_DLLEXPORT int jl_gc_enable(int on)
 {
@@ -2094,7 +2098,7 @@ void *jl_gc_perm_alloc_nolock(size_t sz)
         pool = (void*)LLT_ALIGN((uintptr_t)pool, JL_SMALL_BYTE_ALIGNMENT);
 #else
         void *pool = mmap(0, GC_PERM_POOL_SIZE, PROT_READ | PROT_WRITE,
-                          MAP_NORESERVE | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+                          MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
         if (__unlikely(pool == MAP_FAILED))
             return NULL;
 #endif
diff --git a/src/julia_threads.h b/src/julia_threads.h
index e18eb7283e1d4..5302fa88c31d6 100644
--- a/src/julia_threads.h
+++ b/src/julia_threads.h
@@ -159,7 +159,7 @@ static inline unsigned long JL_CONST_FUNC jl_thread_self(void)
  *     2. (most importantly) we need interoperability between code written
  *        in different languages.
  *        The current c++ standard (c++14) does not allow using c11 atomic
- *        functions or types and there's currently no grantee that the two
+ *        functions or types and there's currently no guarantee that the two
  *        types are compatible (although most of them probably are).
  *        We also need to access these atomic variables from the LLVM JIT code
  *        which is very hard unless the layout of the object is fully
diff --git a/src/safepoint.c b/src/safepoint.c
index 6644f32b63c61..2874266ebe4b5 100644
--- a/src/safepoint.c
+++ b/src/safepoint.c
@@ -93,7 +93,7 @@ void jl_safepoint_init(void)
     char *addr = (char*)VirtualAlloc(NULL, pgsz * 3, MEM_COMMIT, PAGE_READONLY);
 #else
     char *addr = (char*)mmap(0, pgsz * 3, PROT_READ,
-                             MAP_NORESERVE | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+                             MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     if (addr == MAP_FAILED)
         addr = NULL;
 #endif
diff --git a/src/signals-unix.c b/src/signals-unix.c
index 9bf9bdb01f734..f9cea3354e1cb 100644
--- a/src/signals-unix.c
+++ b/src/signals-unix.c
@@ -84,12 +84,24 @@ static void jl_call_in_ctx(jl_ptls_t ptls, void (*fptr)(void), void *_ctx)
     *(void**)rsp = NULL;
     ctx->uc_mcontext.gregs[REG_RSP] = rsp;
     ctx->uc_mcontext.gregs[REG_RIP] = (uintptr_t)fptr;
+#elif defined(_OS_FREEBSD_) && defined(_CPU_X86_64_)
+    ucontext_t *ctx = (ucontext_t*)_ctx;
+    rsp -= sizeof(void*);
+    *(void**)rsp = NULL;
+    ctx->uc_mcontext.mc_rsp = rsp;
+    ctx->uc_mcontext.mc_rip = (uintptr_t)fptr;
 #elif defined(_OS_LINUX_) && defined(_CPU_X86_)
     ucontext_t *ctx = (ucontext_t*)_ctx;
     rsp -= sizeof(void*);
     *(void**)rsp = NULL;
     ctx->uc_mcontext.gregs[REG_ESP] = rsp;
     ctx->uc_mcontext.gregs[REG_EIP] = (uintptr_t)fptr;
+#elif defined(_OS_FREEBSD_) && defined(_CPU_X86_)
+    ucontext_t *ctx = (ucontext_t*)_ctx;
+    rsp -= sizeof(void*);
+    *(void**)rsp = NULL;
+    ctx->uc_mcontext.mc_esp = rsp;
+    ctx->uc_mcontext.mc_eip = (uintptr_t)fptr;
 #elif defined(_OS_LINUX_) && defined(_CPU_AARCH64_)
     ucontext_t *ctx = (ucontext_t*)_ctx;
     ctx->uc_mcontext.sp = rsp;
@@ -112,7 +124,8 @@ static void jl_call_in_ctx(jl_ptls_t ptls, void (*fptr)(void), void *_ctx)
     ctx->uc_mcontext64->__ss.__rsp = rsp;
     ctx->uc_mcontext64->__ss.__rip = (uintptr_t)fptr;
 #else
-    // TODO Add support for FreeBSD and PowerPC(64)?
+#warning "julia: throw-in-context not supported on this platform"
+    // TODO Add support for PowerPC(64)?
     fptr();
 #endif
 }
@@ -436,7 +449,7 @@ static void *alloc_sigstack(size_t size)
     // Add one guard page to catch stack overflow in the signal handler
     size = LLT_ALIGN(size, pagesz) + pagesz;
     void *stackbuff = mmap(0, size, PROT_READ | PROT_WRITE,
-                           MAP_NORESERVE | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+                           MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
     if (stackbuff == MAP_FAILED)
         jl_errorf("fatal error allocating signal stack: mmap: %s",
                   strerror(errno));
diff --git a/src/task.c b/src/task.c
index 105e80d34d579..81b9b564211ce 100644
--- a/src/task.c
+++ b/src/task.c
@@ -359,7 +359,7 @@ static void ctx_switch(jl_ptls_t ptls, jl_task_t *t, jl_jmp_buf *where)
                 " push %%ebp;\n" // instead of ESP
                 " jmp %P1;\n" // call `start_task` with fake stack frame
                 " ud2"
-                : : "r" (stackbase), ""(&start_task) : "memory" );
+                : : "r" (stackbase), "X"(&start_task) : "memory" );
 #elif defined(_CPU_AARCH64_)
             asm(" mov sp, %0;\n"
                 " mov x29, xzr;\n" // Clear link register (x29) and frame pointer