diff --git a/.gitignore b/.gitignore
index 76e43f3..a0ca3ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,7 @@ doc/*.png
 doc/*.css
 _build
 /.eqc-info
+priv/enacl_nif.dll
+priv/enacl_nif.exp
+priv/enacl_nif.lib
+c_src/enacl_nif.d
diff --git a/c_src/Makefile b/c_src/Makefile
deleted file mode 100644
index 6fbe66e..0000000
--- a/c_src/Makefile
+++ /dev/null
@@ -1,75 +0,0 @@
-# Based on c_src.mk from erlang.mk by Loïc Hoguin <essen@ninenines.eu>
-
-PROJECT ?= enacl_nif
-
-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.
-MACHINE_SYS := $(shell uname -m)
-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 ($(UNAME_SYS), FreeBSD)
-	CC ?= cc
-	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes -I /usr/local/include
-	CXXFLAGS ?= -O3 -finline-functions -Wall
-	LDFLAGS ?= -fPIC -L /usr/local/lib
-else ifeq ($(UNAME_SYS), Linux)
-	CC ?= gcc
-	CFLAGS ?= -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes
-	CXXFLAGS ?= -O3 -finline-functions -Wall
-else ifeq ($(UNAME_SYS), SunOS)
-	CC = gcc
-	CFLAGS ?= -m64 -I/opt/local/include -O2 -std=c99 -finline-functions -Wall -Wmissing-prototypes
-	CXXFALGS ?= -O2 -finline-function -Wall
-	LDFLAGS ?= -m64 -fPIC -L /opt/local/lib
-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 -lsodium
-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)
-	$(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/c_src/enacl_nif.c b/c_src/enacl_nif.c
index 1497215..2af0b0a 100644
--- a/c_src/enacl_nif.c
+++ b/c_src/enacl_nif.c
@@ -1515,7 +1515,7 @@ static
 crypto_generichash_state *align64(void *ptr){
   if((unsigned long)ptr % 64 == 0)
     return ptr;
-  return ptr + (64 - ((unsigned long)ptr % 64));
+  return (unsigned long)ptr + (64 - ((unsigned long)ptr % 64));
 }
 
 static
diff --git a/rebar.config b/rebar.config
index 36767fa..36c287a 100644
--- a/rebar.config
+++ b/rebar.config
@@ -1,9 +1,37 @@
 {erl_opts, [debug_info]}.
 
-{pre_hooks, [{"freebsd", compile, "gmake -C c_src"},
-             {"freebsd", clean, "gmake -C c_src clean"},
-             {"netbsd", compile, "gmake -C c_src"},
-             {"netbsd", clean, "gmake -C c_src clean"},
-             {"(linux|darwin|solaris)", compile, "make -C c_src"},
-             {"(linux|darwin|solaris)", clean, "make -C c_src clean"}
+{plugins, [pc]}.
+
+{provider_hooks, [
+    {pre, [
+        {compile, {pc, compile}},
+        {clean,   {pc, clean}}
+    ]}
+]}.
+
+{port_specs, [
+    {"priv/enacl_nif.so", [
+        "c_src/*.c"
+    ]}
+]}.
+
+{port_env, [
+    {"darwin", "CFLAGS", "$CFLAGS -fPIC -O3 -std=c99 -arch x86_64 -finline-functions -Wall -Wmissing-prototypes"},
+    {"darwin", "CXXFLAGS", "$CXXFLAGS -fPIC -O3 -arch x86_64 -finline-functions -Wall"},
+    {"darwin", "LDFLAGS", "$LDFLAGS -arch x86_64 -flat_namespace -undefined suppress -lsodium"},
+
+    {"linux", "CFLAGS", "$CFLAGS -fPIC -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes"},
+    {"linux", "CXXFLAGS", "$CXXFLAGS -fPIC -O3 -finline-functions -Wall"},
+    {"linux", "LDFLAGS", "$LDFLAGS -lsodium"},
+
+    {"freebsd", "CFLAGS", "$CFLAGS -fPIC -O3 -std=c99 -finline-functions -Wall -Wmissing-prototypes -I /usr/local/include"},
+    {"freebsd", "CXXFLAGS", "$CXXFLAGS -fPIC -O3 -finline-functions -Wall"},
+    {"freebsd", "LDFLAGS", "$LDFLAGS -fPIC -L /usr/local/lib -lsodium"},
+
+    {"solaris", "CFLAGS", "$CFLAGS -fPIC -m64 -I/opt/local/include -O2 -std=c99 -finline-functions -Wall -Wmissing-prototypes"},
+    {"solaris", "CXXFLAGS", "$CXXFLAGS -fPIC -O2 -finline-function -Wall"},
+    {"solaris", "LDFLAGS", "$LDFLAGS -m64 -fPIC -L /opt/local/lib -lsodium"},
+
+    {"win32", "CFLAGS", "$CFLAGS /LD /O2 /DNDEBUG"},
+    {"win32", "LDFLAGS", "$LDFLAGS libsodium.dll.a"}
 ]}.