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	diff --git a/Makefile b/Makefile
	index 2e0a47f..11c1186 100644
	--- a/Makefile
	+++ b/Makefile
	@@ -1,29 +1,32 @@
	calling_from_make:
	mix compile

	UNAME := $(shell uname)

	-CFLAGS ?= -Wall -Werror -Wno-unused-parameter -pedantic -std=c99 -O2
	+CFLAGS ?= -Wall -Werror -Wextra -Wno-unused-parameter -pedantic -O2 -fPIC

	ifeq ($(UNAME), Darwin)
	- TARGET_CFLAGS ?= -fPIC -undefined dynamic_lookup -dynamiclib -Wextra
	+ TARGET_CFLAGS ?= -undefined dynamic_lookup -dynamiclib -Wextra
	+else
	+ TARGET_CFLAGS ?= -shared
	+
	+# c_src/spawner.c fails to compile on NetBSD and Darwin with -D_POSIX_C_SOURCE=200809L
	+# Meanwhile *-linux-musl needs it
	+ifneq (${UNAME}, NetBSD)
	+ CFLAGS += -D_POSIX_C_SOURCE=200809L
	endif
	-
	-ifeq ($(UNAME), Linux)
	- CFLAGS += -D_POSIX_C_SOURCE=200809L
	- TARGET_CFLAGS ?= -fPIC -shared
	endif

	all: priv/exile.so priv/spawner
	@echo > /dev/null

	priv/exile.so: c_src/exile.c
	mkdir -p priv
	- $(CC) -I$(ERL_INTERFACE_INCLUDE_DIR) $(TARGET_CFLAGS) $(CFLAGS) c_src/exile.c -o priv/exile.so
	+ $(CC) -std=c99 -I$(ERL_INTERFACE_INCLUDE_DIR) $(TARGET_CFLAGS) $(CFLAGS) c_src/exile.c -o priv/exile.so

	priv/spawner: c_src/spawner.c
	mkdir -p priv
	- $(CC) $(CFLAGS) c_src/spawner.c -o priv/spawner
	+ $(CC) -std=c99 $(CFLAGS) c_src/spawner.c -o priv/spawner

	clean:
	@rm -rf priv/exile.so priv/spawner