I am uploading a NMU to fix this.
The debdiff is attached.
diff -Nru gnushogi-1.5~git20140725/debian/changelog
gnushogi-1.5~git20140725/debian/changelog
--- gnushogi-1.5~git20140725/debian/changelog 2023-08-10 21:39:21.000000000
+0000
+++ gnushogi-1.5~git20140725/debian/changelog 2024-12-31 15:39:32.000000000
+0000
@@ -1,3 +1,10 @@
+gnushogi (1.5~git20140725-2.2) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Allow incompatible pointer types. (Closes: #1091258)
+
+ -- Bastian Germann <b...@debian.org> Tue, 31 Dec 2024 15:39:32 +0000
+
gnushogi (1.5~git20140725-2.1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru gnushogi-1.5~git20140725/debian/rules
gnushogi-1.5~git20140725/debian/rules
--- gnushogi-1.5~git20140725/debian/rules 2023-08-10 21:39:21.000000000
+0000
+++ gnushogi-1.5~git20140725/debian/rules 2024-12-31 15:39:32.000000000
+0000
@@ -3,6 +3,7 @@
export DH_VERBOSE=1
DEB_BUILD_ARCH ?= $(shell dpkg-architecture -qDEB_BUILD_ARCH)
+DEB_CFLAGS_MAINT_APPEND = -Wno-error=incompatible-pointer-types
ifeq ($(DEB_BUILD_ARCH),alpha)
CFLAGS += -O0