diff --git a/lang/polyml/Makefile b/lang/polyml/Makefile
index 441ef51ac46e..82bf90c17d23 100644
--- a/lang/polyml/Makefile
+++ b/lang/polyml/Makefile
@@ -1,43 +1,43 @@
 PORTNAME=	polyml
 PORTVERSION=	5.9.2
 DISTVERSIONPREFIX=	v
 CATEGORIES=	lang
 DIST_SUBDIR=	${PORTNAME}
 
 MAINTAINER=	beyert@cs.ucr.edu
 COMMENT=	Fast open-source implementation of Standard ML
 WWW=		https://www.polyml.org
 
 LICENSE=	LGPL21
 
-ONLY_FOR_ARCHS=	aarch64 amd64 i386
+ONLY_FOR_ARCHS=	aarch64 amd64 i386 powerpc64le powerpc64
 
 LIB_DEPENDS=	libffi.so:devel/libffi
 
 USES=		libtool localbase pathfix pkgconfig
 USE_GITHUB=	yes
 USE_LDCONFIG=	yes
 
 GNU_CONFIGURE=	yes
 GNU_CONFIGURE_MANPREFIX=${PREFIX}/share
 CONFIGURE_ARGS=	--with-system-libffi --enable-shared
 
 INSTALL_TARGET=	install-strip
 
 OPTIONS_DEFINE=	MOTIF GMP INTINF_AS_INT
 OPTIONS_DEFAULT=GMP INTINF_AS_INT
 
 INTINF_AS_INT_DESC=	Use IntInf.int as int type
 
 GMP_LIB_DEPENDS=	libgmp.so:math/gmp
 GMP_CONFIGURE_WITH=	gmp
 INTINF_AS_INT_CONFIGURE_ENABLE=	intinf-as-int
 MOTIF_USES=		motif xorg
 MOTIF_USE=		xorg=x11,xext,xt
 MOTIF_CONFIGURE_WITH=	x
 
 post-patch:
 	@${REINPLACE_CMD} -e 's|-lstdc++ ||' ${WRKSRC}/configure
 	@${REINPLACE_CMD} -e 's| modules||' ${WRKSRC}/Makefile.in
 
 .include <bsd.port.mk>
diff --git a/lang/polyml/files/patch-libpolyml_sighandler.cpp b/lang/polyml/files/patch-libpolyml_sighandler.cpp
new file mode 100644
index 000000000000..2ef8ecaa697c
--- /dev/null
+++ b/lang/polyml/files/patch-libpolyml_sighandler.cpp
@@ -0,0 +1,13 @@
+--- libpolyml/sighandler.cpp.orig	2026-07-07 19:06:37 UTC
++++ libpolyml/sighandler.cpp
+@@ -549,8 +549,8 @@ void SigHandler::Init(void)
+ #ifdef PTHREAD_STACK_MIN
+     // In glibc 2.34 and later, PTHREAD_STACK_MIN may expand to a function call
+     size_t stacksize = PTHREAD_STACK_MIN; // Only small stack.
+-    if (stacksize < 4096U) // But not too small: FreeBSD makes it 2k
+-        stacksize = 4096U;
++    if (stacksize < 65536U) // But not too small: FreeBSD makes it 2k
++        stacksize = 65536U;
+     pthread_attr_setstacksize(&attrs, stacksize);
+ #endif
+     threadRunning = pthread_create(&detectionThreadId, &attrs, SignalDetectionThread, 0) == 0;