--- trealla-3.8.1/GNUmakefile.orig	2026-08-26 08:43:20.000000000 +0200
+++ trealla-3.8.1/GNUmakefile	2026-08-27 18:07:50.405853961 +0200
@@ -1,7 +1,7 @@
 # Installation paths
 .DEFAULT_GOAL := all
 
-PREFIX ?= /usr/local
+PREFIX ?= /usr
 BINDIR ?= $(PREFIX)/bin
 LIBDIR ?= $(PREFIX)/share/trealla
 MANDIR ?= $(PREFIX)/share/man
@@ -10,7 +10,7 @@
 FREESTANDING_BASE_LIBS = builtins error lists iso_ext gensym si
 EMBED_LIBS ?= $(FREESTANDING_BASE_LIBS)
 
-PYTHON ?= python3
+PYTHON ?= python3.9
 QEMU_RISCV_CC ?= riscv64-unknown-elf-gcc
 QEMU_RISCV_AR ?= riscv64-unknown-elf-ar
 QEMU_RISCV_SIZE ?= riscv64-unknown-elf-size
@@ -38,7 +38,7 @@
 GIT_VERSION := "$(shell git describe --abbrev=4 --dirty --always --tags)"
 COMPILER_IS_GCC := $(shell $(CC) --version | grep -E -o 'g?cc')
 
-CFLAGS = -MMD -MP -Isrc -I/usr/local/include -DVERSION='$(GIT_VERSION)' \
+CFLAGS = -MMD -MP -Isrc \
 	-DDEFAULT_LIBRARY_PATH='"$(LIBDIR)/library"' \
 	-O3 $(OPT) \
 	-Wall -Wextra \
@@ -70,7 +70,7 @@
 CFLAGS += -DINDEX_PROFILE
 endif
 
-LDFLAGS = -L/usr/local/lib -lm
+LDFLAGS = -lm
 
 UNAME_S := $(shell uname -s)
 
@@ -91,6 +91,12 @@
 LDFLAGS += -lnetwork
 endif
 
+ifeq ($(UNAME_S), SunOS)
+CFLAGS += -I/usr/lib/MACH64/libffi-3.2.1/include -I/usr/openssl/3/include
+CFLAGS += -Wno-error=int-conversion -Wno-error=implicit-function-declaration
+LDFLAGS += -L/usr/openssl/3/lib/MACH64
+endif
+
 ifdef HOMEBREW_PREFIX
 LDFLAGS += -L$(HOMEBREW_PREFIX)/opt/libffi/lib -L$(HOMEBREW_PREFIX)/opt/openssl@3/lib
 CFLAGS += -I$(HOMEBREW_PREFIX)/opt/libffi/include -I$(HOMEBREW_PREFIX)/opt/openssl@3/include
@@ -147,8 +153,8 @@
 endif
 
 ifdef READLINE
-CFLAGS += -DUSE_READLINE=1 -I$(HOMEBREW_PREFIX)/opt/readline/include
-LDFLAGS += -lreadline -L$(HOMEBREW_PREFIX)/opt/readline/lib
+CFLAGS += -DUSE_READLINE=1 -I$(HOMEBREW_PREFIX)/readline/include
+LDFLAGS += -lreadline -L$(HOMEBREW_PREFIX)/readline/lib
 endif
 
 ifdef EDITLINE
@@ -176,7 +182,7 @@
 endif
 
 ifndef NOFFI
-CFLAGS += -DUSE_FFI=1 -I/usr/local/opt/libffi/include
+CFLAGS += -DUSE_FFI=1
 LDFLAGS += -lffi
 ifeq ($(filter OpenBSD Haiku,$(UNAME_S)),)
 LDFLAGS += -ldl