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Adapted from https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69424625ee866.patch
--- /dev/null
+++ b/osmodel.mak
@@ -0,0 +1,75 @@
+# osmodel.mak
+#
+# Detects and sets the macros:
+#
+# OS = one of {osx,linux,freebsd,openbsd,netbsd,dragonflybsd,solaris}
+# MODEL = one of { 32, 64 }
+# MODEL_FLAG = one of { -m32, -m64 }
+# ARCH = one of { x86, x86_64, aarch64 }
+#
+# Note:
+# Keep this file in sync between druntime, phobos, and dmd repositories!
+# Source: https://github.com/dlang/dmd/blob/master/src/osmodel.mak
+
+
+ifeq (,$(OS))
+ uname_S:=$(shell uname -s)
+ ifeq (Darwin,$(uname_S))
+ OS:=osx
+ endif
+ ifeq (Linux,$(uname_S))
+ OS:=linux
+ endif
+ ifeq (FreeBSD,$(uname_S))
+ OS:=freebsd
+ endif
+ ifeq (OpenBSD,$(uname_S))
+ OS:=openbsd
+ endif
+ ifeq (NetBSD,$(uname_S))
+ OS:=netbsd
+ endif
+ ifeq (DragonFly,$(uname_S))
+ OS:=dragonflybsd
+ endif
+ ifeq (Solaris,$(uname_S))
+ OS:=solaris
+ endif
+ ifeq (SunOS,$(uname_S))
+ OS:=solaris
+ endif
+ ifeq (,$(OS))
+ $(error Unrecognized or unsupported OS for uname: $(uname_S))
+ endif
+endif
+
+# When running make from XCode it may set environment var OS=MACOS.
+# Adjust it here:
+ifeq (MACOS,$(OS))
+ OS:=osx
+endif
+
+ifeq (,$(MODEL))
+ ifeq ($(OS), solaris)
+ uname_M:=$(shell isainfo -n)
+ else
+ uname_M:=$(shell uname -m)
+ endif
+ ifneq (,$(findstring $(uname_M),x86_64 amd64))
+ MODEL:=64
+ ARCH:=x86_64
+ endif
+ ifneq (,$(findstring $(uname_M),aarch64 arm64))
+ MODEL:=64
+ ARCH:=aarch64
+ endif
+ ifneq (,$(findstring $(uname_M),i386 i586 i686))
+ MODEL:=32
+ ARCH:=x86
+ endif
+ ifeq (,$(MODEL))
+ $(error Cannot figure 32/64 model and arch from uname -m: $(uname_M))
+ endif
+endif
+
+MODEL_FLAG:=-m$(MODEL)
--- a/Makefile
+++ b/Makefile
@@ -9,9 +9,8 @@ DUB=dub
WITH_DOC = no
DOC = ../dlang.org
-# Load operating system $(OS) (e.g. linux, osx, ...) and $(MODEL) (e.g. 32, 64) detection Makefile from dmd
-$(shell [ ! -d $(DMD_DIR) ] && git clone --depth=1 https://github.com/dlang/dmd $(DMD_DIR))
-include $(DMD_DIR)/compiler/src/osmodel.mak
+# Load operating system $(OS) (e.g. linux, osx, ...) and $(MODEL) (e.g. 32, 64) detection Makefile
+include osmodel.mak
ifeq (windows,$(OS))
DOTEXE:=.exe
@@ -30,7 +29,7 @@ DFLAGS = $(MODEL_FLAG) $(if $(findstring windows,$(OS)),,-fPIC) -preview=dip1000
DFLAGS += $(WARNINGS)
# Default DUB flags (DUB uses a different architecture format)
-DUBFLAGS = --arch=$(subst 32,x86,$(subst 64,x86_64,$(MODEL)))
+DUBFLAGS = --arch=$(ARCH)
TOOLS = \
$(ROOT)/catdoc$(DOTEXE) \
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