diff --git a/README.md b/README.md
index ec6549d..4d863d7 100644
--- a/README.md
+++ b/README.md
@@ -6,12 +6,12 @@ Slow down input to output
 Install
 -------
 
-    # make clean install
+  # make clean install
 
 Usage
 -----
 
-    $ slow [-t usec] [-f]
+  $ slow [-t usec] [-f]
 
 -t usec : Define sleep between each bytes in micro-second. Default to 1 second.
 
diff --git a/config.mk b/config.mk
index bd994da..6a37cc8 100644
--- a/config.mk
+++ b/config.mk
@@ -11,9 +11,9 @@ INCS =
 LIBS =
 
 # flags
-CPPFLAGS = -DVERSION=\"${VERSION}\" -D_XOPEN_SOURCE=500
+CPPFLAGS = -DVERSION=\"${VERSION}\"
 CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
-LDFLAGS = -static -s ${LIBS}
+LDFLAGS = -s ${LIBS}
 
 # compiler and linker
 CC = cc
diff --git a/slow.c b/slow.c
index d58f409..71b1fef 100644
--- a/slow.c
+++ b/slow.c
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE 500
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
@@ -6,18 +7,12 @@
 
 char *argv0;
 
-static void usage(void);
-
-void
-usage()
-{
+void usage() {
 	fprintf(stderr, "usage: %s [-t usec] [-f]\n", argv0);
-	exit(1);
+	exit(EXIT_FAILURE);
 }
 
-int
-main(int argc, char *argv[])
-{
+int main(int argc, char *argv[]) {
 	char            buffer;
 	size_t          nread;
 	useconds_t      useconds        = 1000000; // default 1 second
@@ -36,20 +31,18 @@ main(int argc, char *argv[])
 
 	while ((nread = fread(&buffer, 1, sizeof buffer, stdin)) > 0) {
 		usleep(useconds);
-
 		if (fwrite(&buffer, 1, nread, stdout) != nread) {
 			fprintf(stderr, "stdout: write error");
-			exit(1);
+			exit(EXIT_FAILURE);
 		}
-
-		if (flush)
+		if (flush) {
 			fflush(stdout);
+		}
 	}
-
 	if (ferror(stdin)) {
 		fprintf(stderr, "stdin: read error");
-		exit(1);
+		exit(EXIT_FAILURE);
 	}
 
-	return 0;
+	return EXIT_SUCCESS;
 }