2 files changed, 33 insertions, 3 deletions
diff --git a/media-radio/wsjtx_improved/files/wsjtx-3.0.0-gcc16.patch b/media-radio/wsjtx_improved/files/wsjtx-3.0.0-gcc16.patch
new file mode 100644
index 000000000000..e4d153237b80
--- /dev/null
+++ b/media-radio/wsjtx_improved/files/wsjtx-3.0.0-gcc16.patch
@@ -0,0 +1,28 @@
+diff --git a/lib/jplsubs.f b/lib/jplsubs.f
+index 0920bc3..e1447e5 100755
+--- a/lib/jplsubs.f
++++ b/lib/jplsubs.f
+@@ -533,7 +533,7 @@ C
+ 
+ C+++++++++++++++++++++++++
+ C
+-      SUBROUTINE SPLIT(TT,FR)
++      SUBROUTINE SSPLIT(TT,FR)
+ C
+ C+++++++++++++++++++++++++
+ C
+@@ -754,11 +754,11 @@ C       ********** MAIN ENTRY POINT **********
+       IF(ET2(1) .EQ. 0.D0) RETURN
+ 
+       S=ET2(1)-.5D0
+-      CALL SPLIT(S,PJD(1))
+-      CALL SPLIT(ET2(2),PJD(3))
++      CALL SSPLIT(S,PJD(1))
++      CALL SSPLIT(ET2(2),PJD(3))
+       PJD(1)=PJD(1)+PJD(3)+.5D0
+       PJD(2)=PJD(2)+PJD(4)
+-      CALL SPLIT(PJD(2),PJD(3))
++      CALL SSPLIT(PJD(2),PJD(3))
+       PJD(1)=PJD(1)+PJD(3)
+ 
+ C       ERROR RETURN FOR EPOCH OUT OF RANGE
diff --git a/media-radio/wsjtx_improved/wsjtx_improved-3.0.0-r1.ebuild b/media-radio/wsjtx_improved/wsjtx_improved-3.0.0-r1.ebuild
index f76aca6634d7..4cd3baf2242d 100644
--- a/media-radio/wsjtx_improved/wsjtx_improved-3.0.0-r1.ebuild
+++ b/media-radio/wsjtx_improved/wsjtx_improved-3.0.0-r1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2025 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -37,6 +37,7 @@ PATCHES=(
 	"${FILESDIR}/wsjtx-2.3.0-drop-docs.patch"
 	"${FILESDIR}/wsjtx-clang.patch"
 	"${FILESDIR}/wsjtx-3.0.0-fix-sound-dir.patch"
+	"${FILESDIR}/wsjtx-3.0.0-gcc16.patch"
 	"${FILESDIR}/wsjtx-2.8.0-qt692-audio.patch"
 )
 
@@ -65,8 +66,9 @@ src_configure() {
 		-DCMAKE_INSTALL_DOCDIR="share/doc/${PF}"
 	)
 	append-ldflags -no-pie
-	# fix executable stack from fortran nested functions
-	append-fflags -ftrampoline-impl=heap
+	# fix executable stack from fortran nested functions, placing them on the
+	# heap. Switch is only supported for newer GCC versions (bug #968790).
+	append-fflags $(test-flags-FC -ftrampoline-impl=heap)
 	cmake_src_configure
 }