diff --git a/tex/luametatex/Portfile b/tex/luametatex/Portfile
index b9479c7c9a9..65f6d5d00cc 100644
--- a/tex/luametatex/Portfile
+++ b/tex/luametatex/Portfile
@@ -24,3 +24,16 @@ checksums           rmd160  aa5220eb803e6a8cd67279d52c905ae832925b86 \
                     size    3464142
 
 compiler.c_standard 2011
+
+# Fix GCC build (primarily for 10.5/10.6).
+# 1. Apple's ld doesn't support -z; use -stack_size instead
+#    https://trac.macports.org/ticket/74037
+# 2. Upstream's post-build strip uses GNU flags (-g -S -d -x) that Apple's
+#    strip doesn't support; use -x -S instead
+#    https://trac.macports.org/ticket/72204
+post-patch {
+    reinplace "s|-Wl,-z,stack-size=2621440|-Wl,-stack_size,0x280000|g" \
+        ${worksrcpath}/CMakeLists.txt
+    reinplace {s|${CMAKE_STRIP} -g -S -d -x|${CMAKE_STRIP} -x -S|g} \
+        ${worksrcpath}/cmake/luametatex.cmake
+}