diff --git a/devel/stack/Makefile b/devel/stack/Makefile
--- a/devel/stack/Makefile
+++ b/devel/stack/Makefile
@@ -189,6 +189,12 @@
 
 .include <bsd.port.pre.mk>
 
+.if ${ARCH} == aarch64
+# Keep it in sync with LLVM_VERSION in lang/ghc
+LLVM_VERSION=	10
+RUN_DEPENDS+=	llc${LLVM_VERSION}:devel/llvm${LLVM_VERSION}
+.endif
+
 .if ${OSVERSION} >= 1300078 && ${ARCH} != powerpc64
 LIB_DEPENDS+=	libncursesw.so.8:misc/compat12x
 .endif
diff --git a/devel/stack/files/patch-__cabal__deps_cryptonite-0.29_cbits_decaf_include_word.h b/devel/stack/files/patch-__cabal__deps_cryptonite-0.29_cbits_decaf_include_word.h
new file mode 100644
--- /dev/null
+++ b/devel/stack/files/patch-__cabal__deps_cryptonite-0.29_cbits_decaf_include_word.h
@@ -0,0 +1,13 @@
+https://github.com/haskell-crypto/cryptonite/issues/350
+
+--- _cabal_deps/cryptonite-0.29/cbits/decaf/include/word.h.orig	2019-09-08 00:46:48 UTC
++++ _cabal_deps/cryptonite-0.29/cbits/decaf/include/word.h
+@@ -238,7 +238,7 @@ malloc_vector(size_t size) {
+ /* PERF: vectorize vs unroll */
+ #ifdef __clang__
+ #if 100*__clang_major__ + __clang_minor__ > 305
+-#define UNROLL _Pragma("clang loop unroll(full)")
++//#define UNROLL _Pragma("clang loop unroll(full)")
+ #endif
+ #endif
+ 
diff --git a/devel/stack/files/patch-src_Stack_Setup.hs b/devel/stack/files/patch-src_Stack_Setup.hs
new file mode 100644
--- /dev/null
+++ b/devel/stack/files/patch-src_Stack_Setup.hs
@@ -0,0 +1,12 @@
+https://github.com/commercialhaskell/stack/pull/5622
+
+--- src/Stack/Setup.hs.orig	2021-07-19 21:35:32 UTC
++++ src/Stack/Setup.hs
+@@ -1266,6 +1266,7 @@ getOSKey platform =
+         Platform Arm                   Cabal.Linux   -> return "linux-armv7"
+         Platform AArch64               Cabal.Linux   -> return "linux-aarch64"
+         Platform Sparc                 Cabal.Linux   -> return "linux-sparc"
++        Platform AArch64               Cabal.FreeBSD -> return "freebsd-aarch64"
+         Platform arch os -> throwM $ UnsupportedSetupCombo os arch
+ 
+ downloadOrUseLocal