IOQuake3 does not not support PowerPC on any *BSD. In just 3 patches I got it working on OpenBSD 6.7/macppc, graphics acceleration and all. I do plan on sending this to IOQuake3 as well.
Makefile 4c4 < ONLY_FOR_ARCHS= amd64 i386 --- > ONLY_FOR_ARCHS= amd64 i386 macppc 35a36,38 > .if ${MACHINE_ARCH} == "powerpc" > QUAKE_ARCH= ppc > .else 36a40 > .endif (Updated) patches/patch-Makefile $OpenBSD: patch-Makefile,v 1.2 2018/04/16 13:12:22 abieber Exp $ Index: Makefile --- Makefile.orig +++ Makefile @@ -4,7 +4,7 @@ # GNU Make required # COMPILE_PLATFORM=$(shell uname | sed -e 's/_.*//' | tr '[:upper:]' '[:lower:]' | sed -e 's/\//_/g') -COMPILE_ARCH=$(shell uname -m | sed -e 's/i.86/x86/' | sed -e 's/^arm.*/arm/') +COMPILE_ARCH=$(shell uname -m | sed -e 's/i.86/x86/' | sed -e 's/macppc/ppc/' | sed -e 's/^arm.*/arm/') ifeq ($(COMPILE_PLATFORM),sunos) # Solaris uname and GNU uname differ @@ -769,16 +769,16 @@ ifeq ($(PLATFORM),openbsd) -pipe -DUSE_ICON -DMAP_ANONYMOUS=MAP_ANON CLIENT_CFLAGS += $(SDL_CFLAGS) - OPTIMIZEVM = -O3 + OPTIMIZEVM = OPTIMIZE = $(OPTIMIZEVM) -ffast-math ifeq ($(ARCH),x86_64) - OPTIMIZEVM = -O3 + OPTIMIZEVM = OPTIMIZE = $(OPTIMIZEVM) -ffast-math HAVE_VM_COMPILED = true else ifeq ($(ARCH),x86) - OPTIMIZEVM = -O3 -march=i586 + OPTIMIZEVM = -march=i586 OPTIMIZE = $(OPTIMIZEVM) -ffast-math HAVE_VM_COMPILED=true else @@ -1562,7 +1562,6 @@ Q3CPPOBJ = \ $(B)/tools/cpp/eval.o \ $(B)/tools/cpp/include.o \ $(B)/tools/cpp/hideset.o \ - $(B)/tools/cpp/getopt.o \ $(B)/tools/cpp/unix.o $(B)/tools/cpp/%.o: $(Q3CPPDIR)/%.c (New) patch-code_qcommon_q_platform_h $OpenBSD$ Index: code/qcommon/q_platform.h --- code/qcommon/q_platform.h.orig +++ code/qcommon/q_platform.h @@ -223,6 +223,8 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, #ifdef __i386__ #define ARCH_STRING "x86" +#elif defined __ppc__ +#define ARCH_STRING "ppc" #elif defined __amd64__ #undef idx64 #define idx64 1