Index: devel/llvm90/Makefile
===================================================================
--- devel/llvm90/Makefile
+++ devel/llvm90/Makefile
@@ -2,7 +2,7 @@
 
 PORTNAME=	llvm
 DISTVERSION=	9.0.1
-PORTREVISION=	0
+PORTREVISION=	1
 CATEGORIES=	devel lang
 MASTER_SITES=	https://github.com/llvm/llvm-project/releases/download/llvmorg-${DISTVERSION}/
 PKGNAMESUFFIX=	${LLVM_SUFFIX}
Index: devel/llvm90/files/clang/patch-D77776
===================================================================
--- /dev/null
+++ devel/llvm90/files/clang/patch-D77776
@@ -0,0 +1,42 @@
+[Driver] Default to libc++ on FreeBSD
+
+Downstream may naively translate between DSL and LLVM target
+triple. If OS version is lost in the process then Clang would
+default to a version that's no longer supported by OS vendor.
+
+https://reviews.llvm.org/D77776
+
+--- tools/clang/lib/Driver/ToolChains/FreeBSD.cpp.orig	2019-12-11 19:15:30 UTC
++++ tools/clang/lib/Driver/ToolChains/FreeBSD.cpp
+@@ -351,7 +351,8 @@ FreeBSD::FreeBSD(const Driver &D, const llvm::Triple &
+ }
+ 
+ ToolChain::CXXStdlibType FreeBSD::GetDefaultCXXStdlibType() const {
+-  if (getTriple().getOSMajorVersion() >= 10)
++  unsigned Major = getTriple().getOSMajorVersion();
++  if (Major >= 10 || Major == 0)
+     return ToolChain::CST_Libcxx;
+   return ToolChain::CST_Libstdcxx;
+ }
+--- tools/clang/test/Driver/freebsd.cpp.orig	2019-12-11 19:15:30 UTC
++++ tools/clang/test/Driver/freebsd.cpp
+@@ -1,13 +1,19 @@
++// RUN: %clangxx %s -### -o %t.o -target amd64-unknown-freebsd -stdlib=platform 2>&1 \
++// RUN:   | FileCheck --check-prefix=CHECK-DEFAULT %s
+ // RUN: %clangxx %s -### -o %t.o -target amd64-unknown-freebsd10.0 -stdlib=platform 2>&1 \
+ // RUN:   | FileCheck --check-prefix=CHECK-TEN %s
+ // RUN: %clangxx %s -### -o %t.o -target amd64-unknown-freebsd9.2 -stdlib=platform 2>&1 \
+ // RUN:   | FileCheck --check-prefix=CHECK-NINE %s
++// CHECK-DEFAULT: "-lc++" "-lm"
+ // CHECK-TEN: "-lc++" "-lm"
+ // CHECK-NINE: "-lstdc++" "-lm"
+ 
++// RUN: %clangxx %s -### -pg -o %t.o -target amd64-unknown-freebsd -stdlib=platform 2>&1 \
++// RUN:   | FileCheck --check-prefix=CHECK-PG-DEFAULT %s
+ // RUN: %clangxx %s -### -pg -o %t.o -target amd64-unknown-freebsd10.0 -stdlib=platform 2>&1 \
+ // RUN:   | FileCheck --check-prefix=CHECK-PG-TEN %s
+ // RUN: %clangxx %s -### -pg -o %t.o -target amd64-unknown-freebsd9.2 -stdlib=platform 2>&1 \
+ // RUN:   | FileCheck --check-prefix=CHECK-PG-NINE %s
++// CHECK-PG-DEFAULT: "-lc++_p" "-lm_p"
+ // CHECK-PG-TEN: "-lc++_p" "-lm_p"
+ // CHECK-PG-NINE: "-lstdc++_p" "-lm_p"