From f47de491fa03965ace51b6d7803e8ea4de2f2cce Mon Sep 17 00:00:00 2001
From: Dave Allured <dave.allured@noaa.gov>
Date: Thu, 5 Mar 2026 08:26:59 -0700
Subject: [PATCH] shtools: Fix 10.7 build

---
 science/shtools/Portfile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/science/shtools/Portfile b/science/shtools/Portfile
index c21a1ba68b3..5d3a6274358 100644
--- a/science/shtools/Portfile
+++ b/science/shtools/Portfile
@@ -30,6 +30,12 @@ use_configure       no
 compilers.choose    f90
 compilers.setup     default_fortran
 
+# Xcode clang on 10.7 fails: invalid instruction mnemonic 'cvtsi2sdl'
+# https://github.com/macports/macports-ports/pull/17193
+# https://github.com/william-dawson/NTPoly/issues/192
+compiler.blacklist-append \
+                    {clang < 500}
+
 pre-build {
     build.args      F95=${configure.f90}
 }