diff -ruN orig/gophervr/gophervr/Imakefile.linux patched/gophervr/gophervr/Imakefile.linux
--- orig/gophervr/gophervr/Imakefile.linux	2013-02-18 15:09:04.000000000 -0800
+++ patched/gophervr/gophervr/Imakefile.linux	2026-05-13 17:14:51.720142716 -0700
@@ -2,7 +2,7 @@
 CDEBUGFLAGS 	=  -g -O
 #CDEBUGFLAGS 	=  -O
 #CC		= gcc
-CFLAGS		= -g -O3 -I../gopher -I../gopher/object -I../libvogl/src -I/usr/OpenMotif/include
+CFLAGS		= -g -O2 -std=gnu89 -Wno-error=implicit-function-declaration -Wno-error=int-conversion -Wno-error=incompatible-pointer-types -fcommon -I../gopher -I../gopher/object -I../libvogl/src -I/usr/OpenMotif/include
 INCLUDES	= -I../gopher -I../gopher/object -I../libvogl/src
 
 BURROWOBJS = burrower.o menus.o lcube.o globals.o text.o \
diff -ruN orig/gophervr/Makefile patched/gophervr/Makefile
--- orig/gophervr/Makefile	2015-10-24 15:30:51.000000000 -0700
+++ patched/gophervr/Makefile	2026-05-13 17:14:28.863838684 -0700
@@ -30,10 +30,15 @@
 	(cd gophervr; 	cp Imakefile.sgi Imakefile; xmkmf; $(MAKE) $(MFLAGS))
 
 
+# Flags to coax 2015-era K&R-style C through gcc 14+/15+ (which by
+# default treats `f()` as `f(void)` and promotes several long-standing
+# warnings to errors). See README in the regarding_someodd build bundle.
+LEGACY_CFLAGS = -g -O2 -std=gnu89 -Wno-error=implicit-function-declaration -Wno-error=int-conversion -Wno-error=incompatible-pointer-types -fcommon
+
 linux:
-	(cd gopher ; ./configure )
-	(cd gopher/object ; make all )
-	(cd libtracker; $(MAKE) $(MFLAGS) MACHINE=linux)
+	(cd gopher ; CFLAGS="$(LEGACY_CFLAGS)" ./configure )
+	(cd gopher/object ; $(MAKE) $(MFLAGS) all )
+	(cd libtracker; $(MAKE) $(MFLAGS) MACHINE=linux CFLAGS="$(LEGACY_CFLAGS)")
 	(cd libvogl; 	$(MAKE) $(MFLAGS) linux)
 	(cd gophervr; 	cp Imakefile.linux Imakefile ; xmkmf && $(MAKE) $(MFLAGS))