$NetBSD$

Add NetBSD

Avoid -Werror, avoid tuning for the package builder (create
portable binaries)
Only error is on netbsd:
/usr/include/unwind.h:94:9: note: expected '_Unwind_Ptr {aka void *}' but argument is of type 'uintptr_t {aka long unsigned int}'
 void    _Unwind_SetIP(struct _Unwind_Context *, _Unwind_Ptr);
         ^~~~~~~~~~~~~

Grab ldflags from llvm-config --ldflags, instead of assuming
the output of llvm.libdir is only one argument we can prepend -L
to.

--- Makefile.orig	2019-07-27 10:37:45.000000000 +0000
+++ Makefile
@@ -27,6 +27,11 @@ else
     CXX = c++
   endif
 
+  ifeq ($(UNAME_S),NetBSD)
+    OSTYPE = bsd
+    CXX = c++
+  endif
+
   ifeq ($(UNAME_S),DragonFly)
     OSTYPE = bsd
     CXX = c++
@@ -119,7 +124,7 @@ else
 endif
 
 LIB_EXT ?= a
-BUILD_FLAGS = -march=$(arch) -mtune=$(tune) -Werror -Wconversion \
+BUILD_FLAGS = -Wconversion \
   -Wno-sign-conversion -Wextra -Wall
 LINKER_FLAGS = -march=$(arch) -mtune=$(tune) $(LDFLAGS)
 AR_FLAGS ?= rcs
@@ -319,8 +324,8 @@ ifneq ($(MAKECMDGOALS),clean)
   # (2) the linker flags necessary to link against the prebuilt libraries
   # (3) a list of include directories for a set of libraries
   # (4) a list of the libraries to link against
-  llvm.libdir := $(CROSS_SYSROOT)$(subst -L,,$(shell $(LLVM_CONFIG) --ldflags $(LLVM_LINK_STATIC)))
-  llvm.ldflags := -L$(llvm.libdir)
+  llvm.libdir := $(CROSS_SYSROOT)$(shell $(LLVM_CONFIG) --libdir)
+  llvm.ldflags := $(CROSS_SYSROOT)$(shell $(LLVM_CONFIG) --ldflags)
 
   # Set rpath for ponyc if we're dynamically linking LLVM_VENDOR
   ifeq (,$(LLVM_LINK_STATIC))
@@ -394,7 +399,7 @@ ifeq ($(runtime-bitcode),yes)
 endif
 
 makefile_abs_path := $(realpath $(lastword $(MAKEFILE_LIST)))
-packages_abs_src := $(shell dirname $(makefile_abs_path))/packages
+packages_abs_src := $(ponydir)/packages
 
 $(shell mkdir -p $(PONY_BUILD_DIR))
 $(info Building into $(PONY_BUILD_DIR))