diff --git a/.gitignore b/.gitignore
index 81fb1a5..c75c04d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,5 @@ priv
 edoc-info
 stylesheet.css
 
+_build
+/TEST-file_"sha3.app".xml
diff --git a/c_src/Makefile b/c_src/Makefile
new file mode 100644
index 0000000..d3c3767
--- /dev/null
+++ b/c_src/Makefile
@@ -0,0 +1,74 @@
+# Based on c_src.mk from erlang.mk by Loic Hoguin <essen@ninenines.eu>
+
+CURDIR := $(shell pwd)
+BASEDIR := $(abspath $(CURDIR)/..)
+
+PROJECT ?= $(notdir $(BASEDIR))
+PROJECT := $(strip $(PROJECT))
+
+ERTS_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s/erts-~s/include/\", [code:root_dir(), erlang:system_info(version)]).")
+ERL_INTERFACE_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, include)]).")
+ERL_INTERFACE_LIB_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, lib)]).")
+
+C_SRC_DIR = $(CURDIR)
+C_SRC_OUTPUT ?= $(CURDIR)/../priv/$(PROJECT).so
+
+# System type and C compiler/flags.
+
+UNAME_SYS := $(shell uname -s)
+ifeq ($(UNAME_SYS), Darwin)
+	CC ?= cc
+	CFLAGS ?= -O3 -std=c99 -arch x86_64 -finline-functions -Wall -Wmissing-prototypes
+	CXXFLAGS ?= -O3 -arch x86_64 -finline-functions -Wall
+	LDFLAGS ?= -arch x86_64 -flat_namespace -undefined suppress
+else ifeq ($(UNAME_SYS), FreeBSD)
+	CC ?= cc
+	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
+	CXXFLAGS ?= -O3 -finline-functions -Wall
+else ifeq ($(UNAME_SYS), Linux)
+	CC ?= gcc
+	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
+	CXXFLAGS ?= -O3 -finline-functions -Wall
+endif
+
+CFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR)
+CXXFLAGS += -fPIC -I $(ERTS_INCLUDE_DIR) -I $(ERL_INTERFACE_INCLUDE_DIR)
+
+LDLIBS += -L $(ERL_INTERFACE_LIB_DIR) -lerl_interface -lei
+LDFLAGS += -shared
+
+# Verbosity.
+
+c_verbose_0 = @echo " C     " $(?F);
+c_verbose = $(c_verbose_$(V))
+
+cpp_verbose_0 = @echo " CPP   " $(?F);
+cpp_verbose = $(cpp_verbose_$(V))
+
+link_verbose_0 = @echo " LD    " $(@F);
+link_verbose = $(link_verbose_$(V))
+
+SOURCES := $(shell find $(C_SRC_DIR) -type f \( -name "*.c" -o -name "*.C" -o -name "*.cc" -o -name "*.cpp" \))
+OBJECTS = $(addsuffix .o, $(basename $(SOURCES)))
+
+COMPILE_C = $(c_verbose) $(CC) $(CFLAGS) $(CPPFLAGS) -c
+COMPILE_CPP = $(cpp_verbose) $(CXX) $(CXXFLAGS) $(CPPFLAGS) -c
+
+$(C_SRC_OUTPUT): $(OBJECTS)
+	@mkdir -p $(BASEDIR)/priv/
+	$(link_verbose) $(CC) $(OBJECTS) $(LDFLAGS) $(LDLIBS) -o $(C_SRC_OUTPUT)
+
+%.o: %.c
+	$(COMPILE_C) $(OUTPUT_OPTION) $<
+
+%.o: %.cc
+	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
+
+%.o: %.C
+	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
+
+%.o: %.cpp
+	$(COMPILE_CPP) $(OUTPUT_OPTION) $<
+
+clean:
+	@rm -f $(C_SRC_OUTPUT) $(OBJECTS)
diff --git a/rebar b/rebar
deleted file mode 100755
index e364a2b..0000000
Binary files a/rebar and /dev/null differ
diff --git a/rebar.config b/rebar.config
index ec59721..1b456c9 100644
--- a/rebar.config
+++ b/rebar.config
@@ -6,16 +6,12 @@
 {clean_files, [".eunit",
                "ebin/*.beam"]}.
 
-{port_env, [{"CFLAGS", "$CFLAGS -O2 -finline-functions -fomit-frame-pointer -fno-strict-aliasing -Wmissing-prototypes -Wall -std=c99"}]}.
-
-{port_specs, [
-    % 64 bit only
-    {"priv/sha3_nif.so", ["c_src/sha3_nif.c",
-                          "c_src/KeccakNISTInterface.c",
-                          "c_src/KeccakSponge.c",
-                          "c_src/KeccakF-1600-opt64.c",
-                          "c_src/displayIntermediateValues.c"]}
-]}.
+{pre_hooks,
+  [{"(linux|darwin|solaris)", compile, "make -C c_src"},
+   {"(freebsd)", compile, "gmake -C c_src"}]}.
+{post_hooks,
+  [{"(linux|darwin|solaris)", clean, "make -C c_src clean"},
+   {"(freebsd)", clean, "gmake -C c_src clean"}]}.
 
 {eunit_opts, [{report,{eunit_surefire,[{dir,"."}]}}]}.
 
diff --git a/rebar.lock b/rebar.lock
new file mode 100644
index 0000000..57afcca
--- /dev/null
+++ b/rebar.lock
@@ -0,0 +1 @@
+[].
diff --git a/src/sha3.erl b/src/sha3.erl
index 25f16a8..c8f46ed 100644
--- a/src/sha3.erl
+++ b/src/sha3.erl
@@ -24,7 +24,7 @@ init() ->
                   Path ->
                       Path
               end,
-    erlang:load_nif(filename:join(PrivDir, sha3_nif), 0).
+    erlang:load_nif(filename:join(PrivDir, "erlang-sha3"), 0).
 
 %% @doc Returns a new context for hash operation.
 %%      Bit length of digest (`BitLen') must be one of 224, 256, 384 and 512.