diff --git a/LICENSE b/LICENSE
index c34f735..985d160 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (C) 2012 Connor Olding
+Copyright (C) 2012, 2015 Connor Olding
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation
@@ -20,4 +20,3 @@ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 OTHER DEALINGS IN THE SOFTWARE.
-
diff --git a/Makefile b/Makefile
index a5218e5..bf8026d 100644
--- a/Makefile
+++ b/Makefile
@@ -1,19 +1,14 @@
 PROGRAM = crc32
 .PHONY: all clean install
-FILES = main.c args.c crc32.c
-
-CFLAGS += -Wall -Werror -ansi -pedantic
-LDFLAGS +=
-PREFIX ?= /usr/local
 
 all: $(PROGRAM)
 
-$(PROGRAM): $(FILES)
-	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(FILES)
+$(PROGRAM): main.c
+	$(CC) -o $@ -Wall -Winline -std=gnu11 $(CFLAGS) $(LDFLAGS) $^
 
 clean:
 	-rm -f $(PROGRAM)
 
 install:
-	cp $(PROGRAM) $(PREFIX)/bin
-
+	install -d 0755 $(PREFIX)/bin
+	install -m 0755 $(PROGRAM) $(PREFIX)/bin
diff --git a/args.c b/args.c
index d813194..90d9a55 100644
--- a/args.c
+++ b/args.c
@@ -11,7 +11,8 @@
 static int argc, argi;
 static char **argv, *flag;
 
-static char *nextarg()
+static char *
+nextarg()
 {
 	char *temp = flag;
 	flag = NULL;
@@ -22,7 +23,8 @@ static char *nextarg()
 	return argv[argi];
 }
 
-void args_parse(int argc_, char **argv_,
+void
+args_parse(int argc_, char **argv_,
     void flagfn(char, char*()), void plainfn(char*))
 {
 	argc = argc_;
@@ -54,4 +56,3 @@ void args_parse(int argc_, char **argv_,
 		if (plainfn)
 			plainfn(argv[argi]);
 }
-
diff --git a/args.h b/args.h
index e325306..0b002bc 100644
--- a/args.h
+++ b/args.h
@@ -7,4 +7,3 @@
 
 void args_parse(int argc, char **argv,
     void flagfn(char, char*()), void plainfn(char*));
-
diff --git a/crc32.c b/crc32.c
index 0016db7..8dd6cab 100644
--- a/crc32.c
+++ b/crc32.c
@@ -8,11 +8,11 @@
 typedef unsigned long ulong;
 #include "crc32.h"
 
-ulong crc_reflect(ulong input)
+ulong
+crc_reflect(ulong input)
 {
 	ulong reflected = 0;
-	int i;
-	for (i = 0; i < 4 * 8; i++) {
+	for (int i = 0; i < 4 * 8; i++) {
 		reflected <<= 1;
 		reflected |= input & 1;
 		input >>= 1;
@@ -20,15 +20,15 @@ ulong crc_reflect(ulong input)
 	return reflected;
 }
 
-void crc_fill_table(ulong *table, int big, ulong polynomial)
+void
+crc_fill_table(ulong *table, int big, ulong polynomial)
 {
 	ulong lsb = (big) ? 1 << 31 : 1; /* least significant bit */
 	ulong poly = (big) ? polynomial : crc_reflect(polynomial);
-	int c, i;
 
-	for (c = 0; c < CRC_TABLE_SIZE; c++, table++) {
+	for (int c = 0; c < CRC_TABLE_SIZE; c++, table++) {
 		*table = (big) ? c << 24 : c;
-		for (i = 0; i < 8; i++) {
+		for (int i = 0; i < 8; i++) {
 			if (*table & lsb) {
 				*table = (big) ? *table << 1 : *table >> 1;
 				*table ^= poly;
@@ -40,13 +40,15 @@ void crc_fill_table(ulong *table, int big, ulong polynomial)
 	}
 }
 
-void crc_be_cycle(ulong *table, ulong *remainder, char c)
+void
+crc_be_cycle(ulong *table, ulong *remainder, char c)
 {
 	ulong byte = table[(((*remainder) >> 24) ^ c) & 0xff];
 	*remainder = (((*remainder) << 8) ^ byte) & 0xFFFFFFFF;
 }
 
-void crc_le_cycle(ulong *table, ulong *remainder, char c)
+void
+crc_le_cycle(ulong *table, ulong *remainder, char c)
 {
 	ulong byte = table[((*remainder) ^ c) & 0xFF];
 	*remainder = ((*remainder) >> 8) ^ byte;
diff --git a/main.c b/main.c
index 4609675..2d809ff 100644
--- a/main.c
+++ b/main.c
@@ -10,14 +10,8 @@
 
 typedef unsigned long ulong;
 
-#include "crc32.h"
-#include "args.h"
-
-#ifdef _MSC_VER
-	#define FREOPEN_BLANK ("")
-#else
-	#define FREOPEN_BLANK (NULL)
-#endif
+#include "crc32.c"
+#include "args.c"
 
 #ifndef BUFFER_SIZE
 #define BUFFER_SIZE 4096
@@ -56,7 +50,8 @@ static const char help2[] = "\
 numbers <n> may be entered as hexadecimal or octal with prefixes\n\
 ";
 
-static char *check_next(char flag, char *next) {
+static char
+*check_next(char flag, char *next) {
 	if (!next) {
 		fprintf(stderr, "-%c requires another argument\n", flag);
 		exit(1);
@@ -64,41 +59,43 @@ static char *check_next(char flag, char *next) {
 	return next;
 }
 
-static void handle_flag(char flag, char *(*nextarg)())
+static void
+handle_flag(char flag, char *(*nextarg)())
 {
 	char *next;
 	switch (flag) {
-	case 'h':
+	case 'h': {
 		printf(help1);
 		printf(help2);
-		exit(0);
-	case 'e':
+	} exit(0);
+	case 'e': {
 		big_endian = 1;
-		return;
-	case 'b':
+	} break;
+	case 'b': {
 		print_binary = 1;
-		return;
-	case 'x':
+	} break;
+	case 'x': {
 		xor_output = 0;
-		return;
-	case 'r':
+	} break;
+	case 'r': {
 		reflect_output = 1;
-		return;
-	case 's':
+	} break;
+	case 's': {
 		next = check_next(flag, nextarg());
 		starting = strtoul(next, NULL, 0);
-		break;
-	case 'p':
+	} break;
+	case 'p': {
 		next = check_next(flag, nextarg());
 		polynomial = strtoul(next, NULL, 0);
-		break;
-	default:
+	} break;
+	default: {
 		fprintf(stderr, "Unknown flag: -%c\n", flag);
-		exit(1);
+	} exit(1);
 	}
 }
 
-static void add_input(char *arg)
+static void
+add_input(char *arg)
 {
 	static string_node *last = NULL;
 	string_node *n = calloc(1, sizeof(string_node));
@@ -115,7 +112,8 @@ static void add_input(char *arg)
 	last = n;
 }
 
-static FILE *open_stream(char *filename)
+static FILE *
+open_stream(char *filename)
 {
 	FILE *stream = NULL;
 	stream = fopen(filename, "rb");
@@ -127,23 +125,23 @@ static FILE *open_stream(char *filename)
 }
 
 
-static ulong cycle_file(FILE *stream)
+static ulong
+cycle_file(FILE *stream)
 {
 	ulong remainder = starting;
 	void (*cycle)(ulong*, ulong*, char) =
 	    (big_endian) ? crc_be_cycle : crc_le_cycle;
 	ulong table[CRC_TABLE_SIZE];
-	int i, len;
 
 	crc_fill_table(table, big_endian, polynomial);
 	do {
-		len = fread(buff, 1, BUFFER_SIZE, stream);
+		int len = fread(buff, 1, BUFFER_SIZE, stream);
 		if (ferror(stream)) {
 			perror(NULL);
 			exit(1);
 		}
 
-		for (i = 0; i < len; i++)
+		for (int i = 0; i < len; i++)
 			cycle(table, &remainder, buff[i]);
 	} while (!feof(stream));
 
@@ -154,7 +152,8 @@ static ulong cycle_file(FILE *stream)
 	return remainder;
 }
 
-static void print_crc(ulong remainder)
+static void
+print_crc(ulong remainder)
 {
 	if (print_binary)
 		fwrite(&remainder, sizeof(remainder), 1, stdout);
@@ -162,7 +161,8 @@ static void print_crc(ulong remainder)
 		printf("%08X\n", (int) remainder);
 }
 
-static void free_nodes(string_node *n)
+static void
+free_nodes(string_node *n)
 {
 	string_node *next;
 	while (n) {
@@ -172,16 +172,16 @@ static void free_nodes(string_node *n)
 	}
 }
 
-int main(int argc, char **argv)
+int
+main(int argc, char **argv)
 {
-	string_node *n;
 	args_parse(argc, argv, handle_flag, add_input);
 
 	if (!input_node) {
-		freopen(FREOPEN_BLANK, "rb", stdin);
+		freopen(NULL, "rb", stdin);
 		print_crc(cycle_file(stdin));
 	}
-	for (n = input_node; n; n = n->next) {
+	for (string_node *n = input_node; n; n = n->next) {
 		FILE *stream = open_stream(n->s);
 		print_crc(cycle_file(stream));
 		fclose(stream);